Page 1 Model 42i Instruction Manual Chemiluminescence NO-NO Analyzer Part Number 101350-00 25Jul2015...
Page 2 © 2007 Thermo Fisher Scientific Inc. All rights reserved. Specifications, terms and pricing are subject to change. Not all products are available in all countries. Please consult your local sales representative for details. Thermo Fisher Scientific Air Quality Instruments 27 Forge Parkway Franklin, MA 02038 1-508-520-0430 www.thermo.com/aqi...
Page 3 WEEE Compliance This product is required to comply with the European Union’s Waste Electrical & Electronic Equipment (WEEE) Directive 2002/96/EC. It is marked with the following symbol: Thermo Fisher Scientific has contracted with one or more recycling/disposal companies in each EU Member State, and this product should be disposed of or recycled through them.
Page 5 Reference Method Designation The Thermo Scientific Model 42i is designated by the United States Environmental Protection Agency (US EPA) as a Reference Method for the measurement of ambient concentrations of nitrogen dioxide pursuant with the requirements defined in the Code of Federal Regulations, Title 40, Part...
Page 7 Appendix B “C-Link Protocol Commands” provides a description of ● the C-Link protocol commands that can be used to remotely control an analyzer using a host device such as a PC or datalogger. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 8 A hazard or unsafe practice could result in minor to ▲ moderate personal injury if the warning is ignored. Equipment Damage A hazard or unsafe practice could result in property ▲ damage if the warning is ignored. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 9 ▲ equipment may be impaired. The service procedures in this manual are restricted to ▲ qualified service personnel only. The Model 42i is supplied with a three-wire grounding cord. Under no circumstances should this grounding ▲ system be defeated. CAUTION If the LCD panel breaks, do not to let the liquid crystal contact your skin or clothes.
Page 10 Service is available from exclusive distributors worldwide. Contact one of the phone numbers below for product support and technical information or visit us on the web at www.thermo.com/aqi. 1-866-282-0430 Toll Free 1-508-520-0430 International Model 42i Instruction Manual Thermo Fisher Scientific...
Page 11: Table Of Contents
Backgrounds ............3-17 NO, NO , and NO Coefficients ........... 3-19 Reset User Calibration Defaults ............. 3-19 Calibration Menu ................3-20 Calibrate NO and NO Backgrounds ..........3-20 Thermo Fisher Scientific Model 42i Instruction Manual...
Page 12 Streaming Data Configuration ............ 3-38 Streaming Data Interval .............. 3-38 Choose Stream Data ..............3-39 Concentrations ................3-39 Other Measurements ..............3-40 Analog Inputs ................3-40 TCP/IP Settings ................3-41 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 13 Interface Board Voltages ............. 3-61 I/O Board Voltages ..............3-61 Temperatures ................. 3-62 Pressure ..................3-62 Flow ....................3-62 Analog Input Readings ..............3-63 Analog Input Voltages ..............3-63 Thermo Fisher Scientific Model 42i Instruction Manual...
Page 14 Restore Default Flow Calibration ..........3-80 Input Board Calibration ..............3-80 Manual Input Calibration ............3-81 Automatic Input Calibration ............3-81 Input Frequency Display ............. 3-82 Temperature Calibration ..............3-82 viii Model 42i Instruction Manual Thermo Fisher Scientific...
Page 15 Flow Controllers ................4-3 Pressure Regulator ................. 4-3 Ozone Generator ................4-4 Diverter Valve ................4-4 Reaction Chamber ................ 4-4 Mixing Chamber ................4-4 Output Manifold ................4-4 Thermo Fisher Scientific Model 42i Instruction Manual...
Page 16 Troubleshooting Guides ..............6-1 Board-Level Connection Diagrams ............. 6-6 Connector Pin Descriptions ..............6-8 Service Locations ................6-21 Chapter 7 Servicing ......................7-1 Safety Precautions ................7-2 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 17 Service Locations ................7-46 Chapter 8 System Description ..................8-1 Hardware .................... 8-1 -to-NO Converter ............... 8-2 Mode Solenoid ................. 8-2 Reaction Chamber ................8-2 Thermo Fisher Scientific Model 42i Instruction Manual...
Page 18 Optional Equipment ................... 9-1 Internal Zero/Span and Sample Valves ..........9-1 Internal Permeation Span Source ............9-2 Permeation Tube Installation ............9-3 Computation of Concentrations ............9-4 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 19 Record Layout Definition ..............B-55 Format Specifier for ASCII Responses ..........B-55 Format Specifier for Binary Responses ........... B-56 Format Specifier for EREC Layout ..........B-56 Text .................... B-56 Thermo Fisher Scientific Model 42i Instruction Manual xiii...
Page 20 Data Sampling/Data Query Command (DA) ........D-4 Measurements reported in response to DA command ..... D-6 Single Range Mode ..............D-6 Dual/Auto Range Mode ............... D-6 Operating and Error Status ............. D-6 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 21 Figures Figure 1–1. Model 42i Flow Schematic ............. 1-3 Figure 2–1. Remove the Packing Material ............2-2 Figure 2–2. Remove the Shipping Screws ............2-2 Figure 2–3. Model 42i Rear Panel ..............2-3 Figure 2–4. Atmospheric Dump Bypass Plumbing ..........2-4 ...
Page 22 Figure 9–1. Bench Mounting ................9-16 Figure 9–2. EIA Rack Mounting ................ 9-17 Figure 9–3. Retrofit Rack Mounting ..............9-18 Figure 9–4. Rack Mount Option Assembly ............9-19 Figure B–1. Flags ....................B-14 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 23 Tables Table 1–1. Model 42i Specifications ..............1-3 Table 1–2. Model 42i Optional Permeation Oven Specifications ...... 1-4 Table 2–1. I/O Terminal Board Pin Descriptions ..........2-6 Table 2–2. D/O Terminal Board Pin Descriptions..........2-7 Table 2–3. 25-Pin Terminal Board Pin Descriptions ........... 2-8 ...
Page 24 Table C–2. Read Registers for 42i ..............C-11 Table C–3. Write Coils for 42i ................C-13 Table D–1. Operating Status for Model 42i ............D-7 Table D–2. Error Status for Model 42i .............. D-7 xviii...
Page 25: Introduction
The Model 42i Chemiluminescence NO-NO Analyzer combines proven detection technology, easy to use menu-driven software, and advanced diagnostics to offer unsurpassed flexibility and reliability. The Model 42i has the following features: 320 x 240 graphics display ● Menu-driven software ●...
Page 26: Principle Of Operation
For more information on servicing, see Chapter 7, “Servicing”. Principle of The Model 42i operates on the principle that nitric oxide (NO) and ozone ) react to produce a characteristic luminescence with an intensity Operation linearly proportional to the NO concentration. Infrared light emission...
Page 27: Specifications
Specifications Figure 1–1. Model 42i Flow Schematic Specifications Table 1–1 lists the specifications for the Model 42i. Table 1–1. Model 42i Specifications Preset ranges 0-0.05, 0.1, 0.2, 0.5, 1, 2, 5, 10, 20 ppm 0-0.1, 0.2, 0.5, 1, 2, 5, 10, 20, 30 mg/m Extended ranges 0-0.2, 0.5, 1, 2, 5, 10, 20, 50, 100 ppm...
Page 28: Table 1-2. Model 42I Optional Permeation Oven Specifications
Temperature range 15– 30 ° Power requirements 120 VAC @ 50/60 Hz, 50 watts (in addition to the standard Model 42i) Weight Approximately 5 lbs. (in addition to the standard Model 42i) Model 42i Instruction Manual Thermo Fisher Scientific...
Page 29: Installation
▲ Unpacking and The Model 42i is shipped complete in one container. If there is obvious damage to the shipping container when you receive the instrument, notify Inspection the carrier immediately and hold for inspection. The carrier is responsible for any damage incurred during shipment.
Page 30: Figure 2-1. Remove The Packing Material
Units with Optional I/O Board Figure 2–1. Remove the Packing Material 4. Remove the three shipping screws (Figure 2–2). Shipping Screws (3) Figure 2–2. Remove the Shipping Screws 5. Check for possible damage during shipment. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 31: Setup Procedure
OD of 1/4-inch and a minimum ID of 1/8-inch. The length of the tubing should be less than 10 feet. Figure 2–3. Model 42i Rear Panel Note Gas must be delivered to the instrument free of particulates. It may be necessary to use the Teflon particulate filter as described in “Teflon...
Page 32: Figure 2-4. Atmospheric Dump Bypass Plumbing
“Terminal Block and Cable Kits” on page 9-13 For detailed information about troubleshooting a connection, refer to “Analog Output Testing” on page 7-26. 5. Plug the instrument into an outlet of the appropriate voltage and frequency. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 33: Connecting External Devices
Installation Connecting External Devices WARNING The Model 42i is supplied with a three-wire grounding cord. Under no circumstances should this grounding system be defeated. ▲ Connecting Several components are available for connecting external devices to iSeries instruments. External Devices These connection options include: Individual terminal board PCB assemblies ●...
Page 34: Figure 2-5. I/O Terminal Board Views
Signal Description Analog1 Power_Fail_NC Analog ground Power_Fail_COM Analog2 Power_Fail_NO Analog ground TTL_Input1 Analog3 TTL_Input2 Analog ground TTL_Input3 Analog4 TTL_Input4 Analog ground Digital ground Analog5 TTL_Input5 Analog ground TTL_Input6 Analog6 TTL_Input7 Analog ground Digital ground Model 42i Instruction Manual Thermo Fisher Scientific...
Page 35: Figure 2-6. D/O Terminal Board Views
Table 2–2. D/O Terminal Board Pin Descriptions Screw Signal Description Screw Signal Description Relay1_ContactA Relay7_ContactA Relay1_ContactB Relay7_ContactB Relay2_ContactA Relay8_ContactA Relay2_ContactB Relay8_ContactB Relay3_ContactA Relay9_ContactA Relay3_ContactB Relay9_ContactB Relay4_ContactA Relay10_ContactA Relay4_ContactB Relay10_ContactB Relay5_ContactA Solenoid_Drive_Output 1 Relay5_ContactB +24V Relay6_ContactA Solenoid_Drive_Output 2 Relay6_ContactB +24V Thermo Fisher Scientific Model 42i Instruction Manual...
Page 36: Figure 2-7. 25-Pin Terminal Board Views
Screw Signal Description IOut1 Analog_In1 Isolated ground Analog_In2 IOut2 Analog_In3 Isolated ground GNDD IOut3 Analog_In4 Isolated ground Analog_In5 IOut4 Analog_In6 Isolated ground GNDD IOut5 Analog_In7 Isolated ground Analog_In8 IOut6 GNDD Isolated ground GNDD Model 42i Instruction Manual Thermo Fisher Scientific...
Page 37: Startup
3. Set instrument parameters such as operating ranges and averaging times to appropriate settings. For more information about instrument parameters, see the “Operation” chapter. 4. Before beginning the actual monitoring, perform a multipoint calibration as described in the “Calibration” chapter. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 39: Operation
Some menus contain more items than can be displayed at one time. For these menus, use to move the cursor up and down to each item. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 40: Pushbuttons
If the liquid crystal contacts your skin or clothes, wash it off immediately using soap and water. ▲ Pushbuttons The Pushbuttons allow the user to traverse the various screens/menus. Figure 3–2. Front Panel Pushbuttons Model 42i Instruction Manual Thermo Fisher Scientific...
Page 41: Soft Keys
All items under the Service menu (including the menu itself) cannot be assigned soft keys. ▲ Thermo Fisher Scientific Model 42i Instruction Manual...
Page 42: Alphanumeric Entry Screen
RANGE DIAGS ALARM RANGE DIAGS ALARM Firmware The Model 42i utilizes the menu-driven firmware as illustrated by the flowchart in Figure 3–3. The Power-Up screen, shown at the top of the Overview flowchart, is displayed each time the instrument is turned on. This screen is displayed while the instrument is warming up and performing self-checks.
Page 43: Figure 3-3. Flowchart Of Menu-Driven Software
Operation Firmware Overview Figure 3–3. Flowchart of Menu-Driven Software Thermo Fisher Scientific Model 42i Instruction Manual...
Page 44: Power-Up Screen
Operation Firmware Overview Power-Up Screen The Power-Up screen is displayed when power is applied to the Model 42i. This screen is displayed while the internal components are warming up and diagnostic checks are being performed. Please wait while booting... Run Screen...
Page 45: Main Menu
Mode” later in this chapter. to move the cursor up and down. ● Press to make a selection. ● Press to return to the Main Menu or to return to the Run ● screen. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 46: Range Menu
By default, the three analog outputs are arranged on the rear panel connector as shown in Figure 3–4. See Table 3–2 for channels and pin Model 42i Instruction Manual Thermo Fisher Scientific...
Page 47: Figure 3-4. Pin-Out Of Rear Panel Connector In Single Range Mode
This enables the sample concentration reading to be sent to the analog outputs at two different ranges. For example, the low NO analog output Thermo Fisher Scientific Model 42i Instruction Manual...
Page 48: Figure 3-5. Pin-Out Of Rear Panel Connector In Dual Range Mode
I/O Terminal Pin Description NO High Range NO Low Range High Range Low Range High Range Low Range Ground 16, 18, 19, 35, 37 2, 4, 6, 8, 10, 12 Signal Ground 3-10 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 49: Auto Range Mode
This is necessary if the two ranges are not close to one another. For example, the low NO range is set to 0–50 ppb and the high NO range is set to 0–20,000 ppb. Figure 3–6. Analog Output in Auto Range Mode Thermo Fisher Scientific Model 42i Instruction Manual 3-11...
Page 50: Figure 3-7. Pin-Out Of Rear Connector In Auto Range Mode
2, 4, 6, 8, 10, 12 Signal Ground Note All channels are user definable. If any customization has been made to the analog output configuration, the default selections may not apply. ▲ 3-12 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 51: Gas Units
The example below shows the NO range screen in single mode. For more information about the dual and auto range modes, see “Single Range Mode”, “Dual Range Mode”, and “Auto Range Mode” earlier in this chapter. Thermo Fisher Scientific Model 42i Instruction Manual 3-13...
Page 52: Table 3-5. Standard Ranges
SAVE VALUE RANGE DIAGS ALARM Table 3–5. Standard Ranges μgm 0.05 0.10 0.20 0.50 1,000 1,000 1.00 2,000 2,000 2.00 5,000 5,000 5.00 10,000 10.0 10,000 10.00 20,000 20.0 20,000 20.00 30,000 30.0 3-14 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 53: Set Custom Ranges
) can be specified as a range. In the Main Menu, choose Range > Set Custom Ranges. ● CUSTOM RANGES: >CUSTOM RANGE 1 55.6 CUSTOM RANGE 2 75.0 CUSTOM RANGE 3 125.0 RANGE DIAGS ALARM Thermo Fisher Scientific Model 42i Instruction Manual 3-15...
Page 54: Averaging Time
NO and NO modes: 1, 2, and 5 seconds. For more information about the manual mode, see “Auto/Manual Mode” later in this chapter. In the Main Menu, choose Averaging Time. ● 3-16 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 55: Calibration Factors Menu
Before the analyzer sets the NO and NO readings to zero, it stores these values as the NO and NO background corrections, respectively. The NO background correction is determined from the NO Thermo Fisher Scientific Model 42i Instruction Manual 3-17...
Page 56 NO reading disappears. In the Main Menu, choose Calibration Factors > NO or NOx Bkg. ● NO BACKGROUND: SET BKG TO: 0.00 ?  INC/DEC  SAVE VALUE RANGE DIAGS ALARM 3-18 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 57: No, No , And No Coefficients
Reset User Calibration The Reset User Calibration Defaults screen allows the user to reset the calibration factors to factory defaults. Defaults In the Main Menu, choose Calibration Factors > Reset User Cal ● Defaults. Thermo Fisher Scientific Model 42i Instruction Manual 3-19...
Page 58: Calibration Menu
The display shows the current NO or NO reading. It is important to note the averaging time when calibrating. The longer the averaging time, the more accurate the calibration will be. To be most 3-20 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 59: Calibrate No, No
The Zero/Span Check menu is available only if the zero/span valve option is installed. It is used to program the instrument to perform fully automated zero and span checks or adjustments. In the Main Menu, choose Calibration > Zero/Span Check. ● Thermo Fisher Scientific Model 42i Instruction Manual 3-21...
Page 60: Next Time
In the Main Menu, choose Calibration > Zero/Span Check > Period ● ZERO/SPAN PERIOD: CURRENTLY: 024 HRS SET TO: HRS ?  MOVE CURSOR  CHANGE VALUE  SAVE RANGE DIAGS ALARM 3-22 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 61: Total Duration Hour
1, 2, 5, 10, 20, 30, 60, 90, 120, 180, 240, and 300 seconds. In the Main Menu, choose Calibration > Zero/Span Check > ● Zero/Span Avg Sec. Thermo Fisher Scientific Model 42i Instruction Manual 3-23...
Page 62: Zero/Span Averaging Time
The Instrument Controls menu contains a number of items that may be selected to control various instrument operational parameters. The software Menu controls listed in this menu enable control of the listed instrument functions. In the Main Menu, choose Instrument Controls. ● 3-24 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 63: Ozonator
▲ In the Main Menu, choose Instrument Controls > Ozonator. ● OZONATOR: CURRENTLY: SET TO: ON ?  TOGGLE VALUE RANGE DIAGS ALARM Thermo Fisher Scientific Model 42i Instruction Manual 3-25...
Page 64: Pmt Supply
Each record can contain up to 32 different fields, or data items, and records can be created at user-defined intervals ranging from 1 to 60 minutes. 3-26 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 65: Select Srec/Lrec
In the Main Menu, choose Instrument Controls > Datalogging Settings ● > Select Srec/Lrec. SELECT LOG TYPE: CURRENTLY: SREC SET TO: LREC ?  TOGGLE VALUE RANGE DIAGS ALARM Thermo Fisher Scientific Model 42i Instruction Manual 3-27...
Page 66: Number Of Records
Date and Time The Date and Time screen is used to set a start date and time for which to view logged data. For example, if “20 Jan 2007 10:00” is entered, then the 3-28 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 67: Date And Time
Concentrations, Other Measurements, and Analog Inputs (if the I/O expansion board is installed). These record fields comprise a temporary list of items for the selected record type that must be committed via the Thermo Fisher Scientific Model 42i Instruction Manual 3-29...
Page 68: Choose Field Data
“Commit Content” below. Range (NO ) is only visible in auto range mode. In the Main Menu, choose Instrument Controls > Datalogging Settings ● > Select Content > select Field > Concentrations. 3-30 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 69 PERM OVN HTR CHAMBER PRES FLOW PMT VOLTS NO BKG NOx BKG LO NO COEF LO NO2 COEF LO NOx COEF HI NO COEF HI NO2 COEF HI NOx COEF OZONATOR FLOW EXT ALARMS Thermo Fisher Scientific Model 42i Instruction Manual 3-31...
Page 70: Commit Content
The Reset to Default Content screen is used to reset all of the datalogging field items to default values for the selected record type. For more information about selecting the content of logged data fields, see “Select Content” above. 3-32 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 71: Configure Datalogging
RANGE DIAGS ALARM Memory Allocation The Memory Allocation Percent screen is used to select the percentage of total memory that may be used by the selected record type (lrecs or srecs). Percent Thermo Fisher Scientific Model 42i Instruction Manual 3-33...
Page 72: Data Treatment
> Configure Datalogging > Data Treatment. SET LREC DATA TYPE: CURRENTLY: SET TO:  CHANGE VALUE  SAVE RANGE DIAGS ALARM Communication The Communication Settings menu is used for communications control and configuration. Settings 3-34 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 73: Communication Settings
19200 ?  CHANGE VALUE  SAVE VALUE RANGE DIAGS ALARM Data Bits The Data Bits screen is used to set the number of serial data bits to either 7 or 8 (default). Thermo Fisher Scientific Model 42i Instruction Manual 3-35...
Page 74: Data Bits
CURRENTLY: SET TO:  CHANGE VALUE  SAVE VALUE RANGE DIAGS ALARM RS-232/RS-485 Selection The RS-232/RS-485 Selection screen allows the user to choose between the RS-232 or RS-485 specification for serial communication. 3-36 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 75: Rs-232/Rs-485 Selection
ID number if two or more instruments of the same model are connected to one computer. Valid Instrument ID numbers are from 0 to 127. The Model 42i has a default Instrument ID of 42. For more information about the Instrument ID, see Appendix B “C-Link...
Page 76: Communication Protocol
The following interval times are available: 1, 2, 5, 10, 20, 30, 60, 90, 120, 180, 240, and 300 seconds. In the Main Menu, choose Instrument Controls > Communication ● Settings > Streaming Data Config > Interval. 3-38 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 77: Streaming Data Interval
) is visible only in auto range mode. In the Main Menu, choose Instrument Controls > Communication ● Settings > Streaming Data Config > select Item > Concentrations. CONCENTRATIONS: >NONE <-- RANGE (NOX) RANGE DIAGS ALARM Thermo Fisher Scientific Model 42i Instruction Manual 3-39...
Page 78: Other Measurements
1–8 will not show if the Ouput Conc Cal option is set to YES in the Instrument Configuration screen. In the Main Menu, choose Instrument Controls > Communication ● Settings > Streaming Data Config > Select Item > Analog Inputs. 3-40 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 79: Analog Inputs
In the Main Menu, choose Instrument Controls > Communication ● Settings > TCP/IP Settings > Use DCHP. DHCP: CURRENTLY: SET TO: ON ?  TOGGLE VALUE CYCLE POWER TO CHANGE DHCP RANGE DIAGS ALARM Thermo Fisher Scientific Model 42i Instruction Manual 3-41...
Page 80 DHCP” above. Any traffic to addresses that are not on the local subnet will be routed through this address. In the Main Menu, choose Instrument Controls > Communication ● Settings > TCP/IP Settings > Gateway. 3-42 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 81 RANGE DIAGS ALARM I/O Configuration The I/O Configuration menu deals with configuration of the analyzer’s I/O system. The analog input configuration is displayed only if the I/O expansion board option is installed. Thermo Fisher Scientific Model 42i Instruction Manual 3-43...
Page 82: Output Relay Settings
Press to toggle and set the logic state open or closed. ● OUTPUT RELAY SETUP: >LOGIC STATE OPEN INSTRUMENT STATE RANGE DIAGS ALARM 3-44 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 83: Alarms
See the Alarms Menu section later in this chapter for more information on alarm items. In the Main Menu, choose Instrument Controls > I/O Configuration > ● Output Relay Settings > Select Relay > Instrument State > Alarms. Thermo Fisher Scientific Model 42i Instruction Manual 3-45...
Page 84 Output Relay Settings > select Relay > Instrument State > Non-Alarm. NON ALARM STATUS ITEMS: >NONE AUTORANGE (NOx) LOCAL/REMOTE SERVICE  UNITS RANGE DIAGS ALARM ZERO MODE SPAN MODE NO MODE NOX MODE SAMPLE MODE PURGE MODE 3-46 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 85: Logic State
Press to toggle and set the logic state to normally open or ● normally closed. DIGITAL INPUT SETUP: >LOGIC STATE OPEN INSTRUMENT STATE RANGE DIAGS ALARM Thermo Fisher Scientific Model 42i Instruction Manual 3-47...
Page 86: Instrument Action
The Allow Over/Under Range screen is used to select whether or not the analog outputs are allowed to exceed the maximum selected value of 100 mV, 1 V, 5 V, 10 V, or 20 mA or the minimum selected value of 0 V, 0 3-48 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 87: Analog Output Configuration (Select Action)
The Select Range screen is used to select the hardware range for the selected analog output channel. Possible ranges for the voltage outputs are: 0-100 mV, 0-1, 0-5, and 0-10 V. Possible ranges for the current outputs are: 0-20 mA and 4-20 mA. Thermo Fisher Scientific Model 42i Instruction Manual 3-49...
Page 88: Table 3-7. Analog Output Zero To Full-Scale Table
Range Setting LO NO Zero (0) Range Setting LO NO Zero (0) Range Setting HI NO Zero (0) Range Setting HI NO Zero (0) Range Setting HI NO Zero (0) Range Setting 3-50 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 89 ▲ In the Main Menu, choose Instrument Controls > I/O Configuration > ● Analog Output Config > select Channel > Choose Signal to Output. Thermo Fisher Scientific Model 42i Instruction Manual 3-51...
Page 90: Analog Input Configuration
PMT Volts Range (NO ) (auto range mode) NO BKG LO NO COEF LO NO COEF LO NO COEF HI NO COEF HI NO COEF HI NO COEF Ozonator Flow Ext Alarms 3-52 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 91: Descriptor
In the Main Menu, choose Instrument Controls > I/O Configuration > ● Analog Input Config > select Channel > Descriptor. ANALOG INPUT DESCRIPTOR: CURRENTLY: IN1 ABCDEFGHIJKLMN BKSP OPQRSTUVWXYZ PAGE 0123456789 ./- SAVE RANGE DIAGS ALARM Thermo Fisher Scientific Model 42i Instruction Manual 3-53...
Page 92: Units
The points range from 2 to 10, with a default of 2. In the Main Menu, choose Instrument Controls > I/O Configuration > ● Analog Input Config > select Channel > Table Points. 3-54 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 93: Number Of Table Points
● Analog Input Config > select Channel > select Point > Volts. TABLE POINT 01 VOLTS: CURRENTLY: 0.00 SET TO: 00.00  MOVE CURSOR  CHANGE VALUE  SAVE RANGE DIAGS ALARM Thermo Fisher Scientific Model 42i Instruction Manual 3-55...
Page 94 Model 42i does not require temperature compensation for EPA equivalency. When temperature compensation is on, the display shows the current internal instrument temperature (measured by a thermistor on the Interface board).
Page 95: Pressure Compensation
This empirical data is used to compensate for any change in reaction chamber pressure. This compensation can be used even though the Model 42i does not require pressure compensation for EPA equivalency. When pressure compensation is on, the first line of the display represents the current pressure in the reaction chamber.
Page 96: Service Mode
DATE AND TIME: 19 MAR 2005 12:34:56 19 MAR 2005 12:34:56  SETTING: DAYS PRESS TO EDIT  SET MONTHS  CHANGE VALUE  SAVE VALUE RANGE DIAGS ALARM RANGE DIAGS ALARM 3-58 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 97: Timezone
This menu is useful when troubleshooting the instrument. The analog input readings and analog input voltages are only displayed if the I/O expansion board option is installed. In the Main Menu, choose Diagnostics. ● Thermo Fisher Scientific Model 42i Instruction Manual 3-59...
Page 98: Program Version
The I/O board item is only displayed if the I/O expansion board option is installed. In the Main Menu, choose Diagnostics > Voltages. ● VOLTAGES: >MOTHERBOARD INTERFACE BOARD I/O BOARD RANGE DIAGS ALARM 3-60 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 99: Motherboard Voltages
I/O expansion board. This menu is only displayed if the I/O expansion board option is installed. In the Main Menu, choose Diagnostics > Voltages > I/O Board ● Voltages. Thermo Fisher Scientific Model 42i Instruction Manual 3-61...
Page 100: I/O Board Voltages
The Flow screen (read only) displays the sample and ozonator flow rate. The flows are measured by internal flow sensors. For more information, see Figure 1–1. In the Main Menu, choose Diagnostics > Flow. ● 3-62 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 101: Analog Input Readings
Pull-ups are provided on all of the inputs, so if nothing is connected they will read (1), if an input is brought to ground, it will read (0). In the Main Menu, choose Diagnostics > Digital Inputs. ● Thermo Fisher Scientific Model 42i Instruction Manual 3-63...
Page 102: Relay States
Full-scale sets the analog outputs to the full- scale voltage, zero sets the analog outputs to 0 volts, and reset returns the output to normal operation. The analog outputs are returned to normal 3-64 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 103: Set Analog Outputs
DIAGS ALARM CONVERTER MOLY DILUTION AUTO CALIBRATION OUTPUT CONC CAL DATA Contact Information The Contact Information screen displays the customer service information. In the Main Menu, choose Diagnostics > Contact Information. ● Thermo Fisher Scientific Model 42i Instruction Manual 3-65...
Page 104: Alarms Menu
DIAGS ALARM PERM GAS TEMP PRESSURE FLOW OZONATOR FLOW ZERO CHECK SPAN CHECK ZERO AUTOCAL SPAN AUTOCAL NO CONCENTRATION NO2 CONCENTRATION NOx CONCENTRATION EXTERANL ALARMS MOTHERBOARD STATUS INTERFACE STATUS I/O EXP STATUS 3-66 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 105: Internal Temperature
(bell) icon appears in the status bar on the Run screen and in the Main Menu. In the Main Menu, choose Alarms > Chamber Temp. ● Thermo Fisher Scientific Model 42i Instruction Manual 3-67...
Page 106: Chamber Temperature
The minimum and Temperature Limits maximum cooler temperature screens function the same way. In the Main Menu, choose Alarms > Cooler Temp > Min or Max. ● 3-68 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 107: Converter Temperature
The Permeation Oven Gas Temperature screen displays the current permeation oven gas temperature and sets the minimum and maximum Gas Temperature alarm limits. Acceptable alarm limits range from 25.00 to 50.00 °C. If the Thermo Fisher Scientific Model 42i Instruction Manual 3-69...
Page 108: Pressure
Run screen and in the Main Menu. In the Main Menu, choose Alarms > Pressure. ● PRESSURE: ACTUAL 232.5 mmHg >MIN 150.0 mmHg 300.0 mmHg RANGE DIAGS ALARM 3-70 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 109: Min And Max Pressure Limits
In the Main Menu, choose Alarms > Flow > Min or Max. ● FLOW: ACTUAL MIN: 0.750 LPM SET MIN TO: 0.760 LPM ?  INC/DEC  SAVE VALUE RANGE DIAGS ALARM Thermo Fisher Scientific Model 42i Instruction Manual 3-71...
Page 110: Ozonator Flow
The Max Zero and Span Check Offset screens are used to change the maximum check offsets. The maximum zero and span offset screens Check Offset function the same way. In the Main Menu, choose Alarms > Zero or Span Check > Max ● Offset. 3-72 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 111: Zero And Span Auto Calibration
NO concentration screens function the same way. In the Main Menu, choose Alarms > NO, NO2, or NOx ● Concentration. NO CONCENTRATION: ACTUAL 62.7 >MIN 100000.0 MIN TRIGGER CEILING RANGE DIAGS ALARM Thermo Fisher Scientific Model 42i Instruction Manual 3-73...
Page 112: Min And Max No, No
Controls > I/O Configuration > Digital Input Settings menu. External alarms can also be logged, streamed, or output as a digital output by choosing “EXT ALARMS” from the Other Measurements list. In the Main Menu, choose Alarms > External Alarms. ● 3-74 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 113: Service Menu
For more information on the service mode, see “Service Mode” earlier in this chapter. Note This adjustment should only be performed by an instrument service technician. ▲ Thermo Fisher Scientific Model 42i Instruction Manual 3-75...
Page 114: Range Mode Select
Note This adjustment should only be performed by an instrument service technician. ▲ In the Main Menu, choose Service > Converter Set Temperature. ● SET CONVERTER TEMP: CURRENTLY: SET TO:  INC/DEC  SAVE VALUE RANGE DIAGS ALARM 3-76 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 115: Pressure Calibration
In the Main Menu, choose Service > Pressure Calibration > Zero. ● CALIBRATE PRESSURE ZERO: CURRENTLY: 232.5 mmHg SET TO: 0.0 mmHg CONNECT VACUUM PUMP AND  SAVE ZERO PRESSURE RANGE DIAGS ALARM Thermo Fisher Scientific Model 42i Instruction Manual 3-77...
Page 116: Calibrate Pressure Span
DIAGS ALARM RANGE DIAGS ALARM Flow Calibration The Flow Calibration submenu is used to calibrate the flow sensor to zero, span, or restore factory default values. The flow calibration screen is visible 3-78 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 117: Calibrate Flow Zero
The Calibrate Flow Span screen allows the user to view and set the flow sensor calibration span point. Note An independent flow sensor is required to read the flow, then the operator enters the flow value on this screen to perform the calibration. ▲ Thermo Fisher Scientific Model 42i Instruction Manual 3-79...
Page 118: Restore Default Flow Calibration
“Service Mode” earlier in the chapter. Note This adjustment should only be performed by an instrument service technician. ▲ In the Main Menu, choose Service > Input Board Calibration. ● 3-80 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 119: Manual Input Calibration
Automatic Input Calibration The Automatic Input Calibration screen is used to do an automatic calibration of the input board A/D stages. A message will be displayed after the optimum setting has been determined. Thermo Fisher Scientific Model 42i Instruction Manual 3-81...
Page 120: Input Frequency Display
The temperature calibration is visible only when the instrument is in service mode. For more information on the service mode, see “Service Mode” earlier in the chapter. 3-82 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 121: Analog Output Calibration
In the Main Menu, choose Service > Analog Out Cal. ● ANALOG OUTPUT CAL: >VOLTAGE CHANNEL 1 VOLTAGE CHANNEL 2 VOLTAGE CHANNEL 3 VOLTAGE CHANNEL 4 VOLTAGE CHANNEL 5  RANGE DIAGS ALARM Thermo Fisher Scientific Model 42i Instruction Manual 3-83...
Page 122: Analog Input Calibration
10 V RANGE DIAGS ALARM Analog Input Calibration The Analog Input Calibration menu is used to calibrate the 8 analog input channels at both zero and full-scale. The Analog Input Calibration menu is 3-84 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 123: Analog Input Calibrate Zero
0.04 V  CALIBRATE INPUT TO ZERO RANGE DIAGS ALARM Analog Input Calibrate The Analog Input Calibrate Full-Scale screen allows the user to calibrate the full-scale state of the selected analog input. Full-Scale Thermo Fisher Scientific Model 42i Instruction Manual 3-85...
Page 124: Permeation Oven Settings
The Calibrate Gas Thermistor menu is used for calibrating the permeation oven gas thermistor using a water bath or known resistance. In the Main Menu, choose Service > Perm Oven Settings > Cal Gas ● Thermistor. 3-86 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 125: Calibrate Gas Thermistor
The Calibrate Oven Thermistor screen is used to view and set the permeation oven thermistor resistance to a known resistor value. In the Main Menu, choose Service > Perm Oven Settings > Cal Oven ● Thermistor. Thermo Fisher Scientific Model 42i Instruction Manual 3-87...
Page 126: Permeation Oven Selection
The low and high point screens function the same way. In the Main Menu, choose Service > Perm Oven Settings > Factory Cal ● Gas Therm > Low or High Point. 3-88 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 127: Factory Calibrate Oven Thermistor
The low and high point screens function the same way. In the Main Menu, choose Service > Perm Oven Settings > Factory Cal ● Oven Therm > Low or High Point. Thermo Fisher Scientific Model 42i Instruction Manual 3-89...
Page 128: Ozonator Safety
For more information on the service mode, see “Service Mode” earlier in the chapter. In the Main Menu, choose Service > Ozonator Safety. ● OZONATOR SAFETY: CURRENTLY: SET TO: ON ?  TOGGLE VALUE RANGE DIAGS ALARM 3-90 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 129: Extended Ranges
For more information on the service mode, see “Service Mode” earlier in the chapter. In the Main Menu, choose Service > Display Pixel Test. ● Thermo Fisher Scientific Model 42i Instruction Manual 3-91...
Page 130: Restore User Defaults
The items visible under the Password menu are determined by the instrument’s password status. In the Main Menu, choose Password. ● PASSWORD MENU: >SET PASSWORD LOCK INSTRUMENT CHANGE PASSWORD REMOVE PASSWORD UNLOCK INSTRUMENT RANGE DIAGS ALARM 3-92 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 131: Set Password
Refer to “C-Link Protocol Commands” appendix for detailed information about “mode”, “allow mode”, and “power up mode” commands. Thermo Fisher Scientific Model 42i Instruction Manual 3-93...
Page 132: Change Password
The unlock instrument screen is shown if the instrument is locked. In the Main Menu, choose Password > Unlock Instrument ● ENTER THE PASSWORD: RANGXXXXXE ABCDEFGHIJKLMN BKSP OPQRSTUVWXYZ PAGE 0123456789 ./- SAVE RANGE DIAGS ALARM 3-94 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 133 Calibration This chapter describes procedures for performing a multipoint calibration of the Model 42i. The information described here is considered adequate to perform the calibration. However, if greater detail is desired, the user is referred to the Code of Federal Regulations, Title 40, Part 50, Appendix F.
Page 134: Calibration
Table 4–1 lists materials that can be effective in removing contaminants. Table 4–1. Scrubbing Materials To Remove Soda-Lime (6-12 mesh), Purafil Hydrocarbons Molecular Sieve (4A), Activated Charcoal and SO Activated Charcoal Model 42i Instruction Manual Thermo Fisher Scientific...
Page 135: Gas Phase Titrator
2% of the required flow rate. Pressure Regulator The pressure regulator for the standard NO cylinder must have a non- reactive diaphragm and internal parts, and a suitable delivery pressure. Figure 4–1. GPT System Thermo Fisher Scientific Model 42i Instruction Manual...
Page 136: Ozone Generator
Procedures for certifying the NO cylinder (working standard) against an NIST traceable NO or NO standard and for determining the amount of impurity are given in EPA Publication No. EPA-600/4-75-003, “Technical Assistance Document for the Chemiluminescence Measurement of Nitrogen Dioxide.” Model 42i Instruction Manual Thermo Fisher Scientific...
Page 137 7. Plot the analyzer NO response versus F and determine the slope which gives [NO] directly. The analyzer NO responses to the generated NO concentrations reflect any NO impurity in the NO working standard. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 138 Use the following procedure to determine the flow conditions to be used in the GPT system. Flow Conditions 1. Determine FT, the total flow required at the output manifold, which should be equal to the analyzer demand plus 10 to 50 percent excess. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 139 8. Compute the diluent air flow rate as: 9. If F turns out to be impractical for the desired system, select a reaction chamber having a different V and recompute F and F Thermo Fisher Scientific Model 42i Instruction Manual...
Page 140 Pre-Calibration Perform the following pre-calibration procedure before calibrating the Model 42i. For detailed information about the menu parameters and the icons used in these procedures, see the “Operation” chapter. Note The calibration and calibration check duration times should be long enough to account for the transition (purge) process when switching from sample to zero and from zero to span.
Page 141 2. Ensure that all flow meters are calibrated under the conditions of use against a reliable standard, such as a soap-bubble meter or wet-test meter. All volumetric flow rates should be corrected to 25 °C and 760 mmHg. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 142 “Operation” chapter. 1. Determine the GPT flow conditions required to meet the dynamic parameter specifications as indicated in “Dynamic Parameter Specifications for Gas Titrator” earlier in this chapter. 4-10 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 143 “Dynamic Parameter Specifications for Gas Phase Titrator” earlier in this chapter. The total GPT airflow must exceed the total demand of the analyzer. The Model 42i requires approximately 700 cc/min of sample flow, and a total GPT airflow of at least 1.5 liters/min is recommended.
Page 144 3. Press to calculate and save the new NO coefficient based on the entered span concentration. 4. Press to return to the Run screen. The exact NO concentration is calculated from: 4-12 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 145 NO and NO concentrations of approximately 80% of the URL, and an intermediate concentration. 5. Adjust the GPT system to generate a NO concentration near 90% of the URL of the instrument range selected. Thermo Fisher Scientific Model 42i Instruction Manual 4-13...
Page 146 0.96, either the entered NO concentration is incorrect, the converter is not being heated to the proper temperature, the instrument needs servicing (leak or imbalance), or the converter needs replacement or servicing. The 4-14 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 147 Therefore, never change any calibration factor without first recording the value so that after any troubleshooting procedure is completed, the initial value can be re-entered thereby not altering the multipoint calibration. ▲ Thermo Fisher Scientific Model 42i Instruction Manual 4-15...
Page 148 1. Follow the “Pre-Calibration” procedure described previously in this chapter. 2. Introduce zero air to the SAMPLE bulkhead and allow the analyzer to sample zero air until the NO, NO , and NO responses stabilize. 4-16 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 149 NO coefficient based on the entered span concentration. Calibrate Low NO Use the following procedure to calibrate the NO channel to the NO calibration gas. Thermo Fisher Scientific Model 42i Instruction Manual 4-17...
Page 150 4. Press to calculate and save the new low NO coefficient based on the entered span concentration. 4-18 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 151 4. Press to return to the Run screen. Calibrate High NO Use the following procedure to calibrate the NO channel to the NO calibration gas. Thermo Fisher Scientific Model 42i Instruction Manual 4-19...
Page 152 Note however, that the EPA requires a minimum of one multipoint calibration per calendar quarter. Such a quality control program is essential 4-20 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 153 Use the following procedure to perform a zero and span check. 1. Connect the zero gas to the SAMPLE bulkhead in a standard instrument or to the ZERO bulkhead in a Model 42i equipped with the zero/span and sample solenoid valve option.
Page 155 Equipment Damage Some internal components can be damaged by small amounts of static electricity. A properly ground antistatic wrist strap must be worn while handling any internal component. For more information about appropriate safety precautions, see the “Servicing” chapter. ▲ Thermo Fisher Scientific Model 42i Instruction Manual...
Page 156 Use the following procedure to inspect and replace the capillaries. This procedure can be used to check any or all of the capillaries. 1. Turn the instrument OFF and unplug the power cord. 2. Remove the instrument cover. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 157: Figure 5-1. Inspecting And Replacing The Capillaries
8. Replace Cajon® fitting. Note that the Cajon® fitting should be tightened slightly more than hand tight. 9. Reconnect tubing to top of fittings, being careful to insert ferrule and O-ring properly, and tighten knurled nut finger tight. 10. Re-install the cover. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 158 2. Flush the filters with warm water and let dry (a clean, oil-free purge will help the drying process) or blow the filters clean with compressed air. 3. Re-install the filters and fan guards. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 159: Figure 5-2. Inspecting And Cleaning The Fan Filters
Refer to this reference line when reassembling the pump head. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 160 4. Remove four screws from top plate using the 3 mm Allen wrench. 5. Remove top plate, flapper valve, and bottom plate. 6. Using needlenose pliers, remove clamping disk holding diaphragm and Teflon protection wafer onto clamping rod, and remove the diaphragm and Teflon wafer. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 161: Figure 5-3. Rebuilding The Pump
Step three to position the components. Make sure not to over-tighten clamping disk. Be sure that the Teflon side of diaphragm faces up and that the flapper valves cover the holes of the top and bottom plate. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 162 Preventive Maintenance Pump Rebuilding 8. Re-install the cover, reconnect the power cord, and turn the instrument 9. Check that the reaction chamber pressure reads between 150 and 250 mmHg. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 163 The troubleshooting guides presented in this chapter are designed to help isolate and identify instrument problems. Guides Table 6–1 provides general troubleshooting information and indicates the checks that you should perform if you experience an instrument problem. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 164: Table 6-1. Troubleshooting - General Guide
Clogged sample air filter Replace filter element. Excessive Noise Defective or low sensitivity Unplug power cord. Remove PMT. Install known good PMT. Plug in power cord. Check performance. Defective input board Replace board. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 165 Temperature should be or too low approximately 325 °C for Molybdenum, 625 °C for stainless steel. Low line voltage Check to see if line voltage is within specifications. Molybdenum consumed Replace Molybdenum converter cartridge. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 166: Table 6-2. Troubleshooting - Alarm Messages
Check the pump for a tear in the diaphragm, replace with pump repair kit if necessary. Refer to “Preventive Maintenance” chapter in this manual. Check that capillaries are properly installed and O- rings are in good shape. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 167 Internal cables not connected Check that all internal cables Status properly are connected properly. Recycle AC power to Alarm - Interface Board is defective instrument. If still alarming, Status change board. Alarm - I/O Exp Status Thermo Fisher Scientific Model 42i Instruction Manual...
Page 168: Figure 6-1. Board-Level Connection Diagram - Common Electronics
3 Cond 2 Pin FRON T PANEL POWER SW TR ANSFO R ME R 3 Pin (90V AC or 240V AC O P TIO NS) Figure 6–1. Board-Level Connection Diagram - Common Electronics Model 42i Instruction Manual Thermo Fisher Scientific...
Page 169: Figure 6-2. Board-Level Connection Diagram - Measurement System
C O NV E R TE R TH E R MO C O U P LE 2 Pin 2 Pin 3 Pin PU MP 3 Pin Figure 6–2. Board-Level Connection Diagram - Measurement System Thermo Fisher Scientific Model 42i Instruction Manual...
Page 170: Table 6-3. Motherboard Connector Pin Descriptions
Ground +RS485 to Interface Board -RS485 to Interface Board 10-BASE-T Ethernet Output (+) Ethernet Output (-) Ethernet Input (+) Ethernet Input (-) EXPANSION BD +24V +24V Ground Ground Ground +RS485 to Expansion Board Model 42i Instruction Manual Thermo Fisher Scientific...
Page 171 TTL Input 15 Ground Analog Voltage 1 Analog Voltage 3 Ground Analog Voltage 5 Ground Ground Power Fail Relay COM Power Fail Relay N.O. Contact Ground TTL Input 3 TTL Input 4 TTL Input 6 Thermo Fisher Scientific Model 42i Instruction Manual...
Page 172 +24V Ground DIGITAL I/O +24V +24V Ground Ground Ground SPI Reset SPI Input SPI Output SPI Board Select SPI Clock EXT. RS485 -RS485 to Rear Panel -RS485 to Rear Panel Ground Ground 6-10 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 173 LD2 – LCD Signal LD7 – LCD Signal LD3 – LCD Signal LCD Bias Voltagel Ground Ground LCD_ONOFF – LCD Signal Keypad Row 2 Input Keypad Row 1 Input Keypad Row 4 Input Thermo Fisher Scientific Model 42i Instruction Manual 6-11...
Page 174 Serial Port 2 RX (-RS485 IN) Serial Port 2 TX (-RS485 OUT) Ground Serial Port 2 RTS (+RS485 OUT) Serial Port 2 CTS (+RS485 IN) AC IN AC-HOT AC-NEUT AC-Ground AC 24VPWR AC-HOT AC-NEUT 6-12 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 175: Table 6-4. Measurement Interface Board Connector Pin Descriptions
SPI Output SPI Clock SPI Board Select AMB TEMP Ambient Temperature Thermistor Ground HVPS MJ10 HV Power Supply Voltage Adjust Ground HV Power Supply On/Off Ground HV Power Supply Voltage Monitor Ground Thermo Fisher Scientific Model 42i Instruction Manual 6-13...
Page 176 24V IN +24V Ground AC PUMP AC-HOT AC-NEUT AC-Ground FAN 1 +24V Ground FAN 2 +24V Ground AC IN AC-HOT AC-NEUT AC-Ground COOLER Cooler Thermistor Ground +15V_PWR Cooler On/Off Control AC TEMP AC-HOT 6-14 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 177: Table 6-5. Front Panel Board Connector Pin Diagram
Ground Ground LCLK – LCD Signal Ground Ground LLP – LCD Signal LFLM – LCD Signal LD4 – LCD Signal LD0 – LCD Signal LD5 – LCD Signal LD1 – LCD Signal Thermo Fisher Scientific Model 42i Instruction Manual 6-15...
Page 178 LD0_5V – LCD Signal LD1_5V – LCD Signal LD2_5V – LCD Signal LD3_ONOFF_5V – LCD Signal LCD_ONOFF_5V – LCD Signal LFLM_5V – LCD Signal LLP_5V – LCD Signal LCLK_5V – LCD Signal Ground 6-16 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 179: Table 6-6. I/O Expansion Board (Optional) Connector Pin Descriptions
Analog Voltage Input 3 Ground Analog Voltage Input 4 Analog Voltage Input 5 Analog Voltage Input 6 Ground Analog Voltage Input 7 Analog Voltage Input 8 Ground Current Output Return Ground Current Output 1 Thermo Fisher Scientific Model 42i Instruction Manual 6-17...
Page 180: Table 6-7. Digital Output Board Connector Pin Descriptions
Table 6–7. Digital Output Board Connector Pin Descriptions Connector Reference Signal Description Label Designator MOTHER BD +24V +24V Ground Ground Ground SPI Reset SPI Input SPI Output SPI Board Select SPI Clock 6-18 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 181 Relay 4 Contact b Relay 5 Contact b Relay 6 Contact b Relay 7 Contact b Relay 8 Contact b Relay 9 Contact b Relay 10 Contact b +24V +24V +24V +24V Thermo Fisher Scientific Model 42i Instruction Manual 6-19...
Page 182: Table 6-8. Input Board Connector Pin Descriptions
Table 6–9. Temperature Control Board Connector Pin Descriptions Connector Reference Signal Description Label Designator INTERFACE Bench Temperature Input Ground -15V Converter Heater On/Off Converter Temperature Input +15V_PWR AC INPUT AC-HOT AC-NEUT BENCH Bench Heater AC Output 6-20 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 183 For additional assistance, service is available from exclusive distributors worldwide. Contact one of the phone numbers below for product support Locations and technical information or visit us on the web at www.thermo.com/aqi. 1-866-282-0430 Toll Free 1-508-520-0430 International Thermo Fisher Scientific Model 42i Instruction Manual 6-21...
Page 185 Chapter 7 Servicing This chapter explains how to replace the Model 42i subassemblies. It assumes that a subassembly has been identified as defective and needs to be replaced. For fault location information refer to the “Preventive Maintenance” chapter and the “Troubleshooting” chapter in this manual.
Page 186 “Service Locations” on page 7-46 ● Safety Precautions Read the safety precautions before beginning any procedures in this chapter. WARNING The service procedures in this manual are restricted to qualified service representatives. ▲ Model 42i Instruction Manual Thermo Fisher Scientific...
Page 187 LCD module, use a soft cloth moistened with a naphtha cleaning solvent. ▲ Do not place the LCD module near organic solvents or corrosive gases. ▲ Do not shake or jolt the LCD module. ▲ Thermo Fisher Scientific Model 42i Instruction Manual...
Page 188: Figure 7-1. Properly Grounded Antistatic Wrist Strap
> to return to the Main Menu. 4. Return to the procedure. Replacement Parts Table 7–1 lists the replacement parts for the Model 42i major subassemblies. Refer to Figure 7–2 to identify the component location. List Table 7–1. Model 42i Replacement Parts...
Page 189 Fuse, 250VAC, 4.0 Amp, SlowBlow (for 100VAC and 110VAC models) 101904-00 Fuse, 250VAC, 2.0 Amp, SlowBlow (for 220-240VAC models) 101688-00 Ambient Temperature Connector with Thermistor 4119 Capillary 0.008-inch ID 4127 Capillary 0.015-inch ID Thermo Fisher Scientific Model 42i Instruction Manual...
Page 190: Table 7-2. Model 42I Cables
Optical Filter Kit (Red Filter, Quartz Window, Rubber Washer) 6998 DriRite Cable List Table 7–2 describes the Model 42i spare cables. See the “Troubleshooting” chapter for associated connection diagrams and board connector pin descriptions. Table 7–2. Model 42i Cables Part Number...
Page 191: Figure 7-2. Component Layout
Flow Scrubber Switch Capillaries (2) Pressure Transducer Input Board HVPS Pump Thermistor Measurement Interface Board I/O Expansion Board (Opt) Power Supply Ozonator Ozonator Motherboard Digital Output Board Transformer Solenoid Figure 7–2. Component Layout Thermo Fisher Scientific Model 42i Instruction Manual...
Page 192: Figure 7-3. Removing The Measurement Bench And Lowering The Partition Panel
Equipment Damage Some internal components can be damaged by small amounts of static electricity. A properly ground antistatic wrist strap must be worn while handling any internal component. ▲ 1. Turn instrument OFF and unplug the power cord. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 193 Equipment Damage Some internal components can be damaged by small amounts of static electricity. A properly ground antistatic wrist strap must be worn while handling any internal component. ▲ 1. Turn instrument OFF, unplug the power cord, and remove the cover. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 194: Figure 7-4. Replacing The Pump
Fan Filter Philips screwdriver Equipment Damage Some internal components can be damaged by small amounts of static electricity. A properly ground antistatic wrist strap must be worn while handling any internal component. ▲ 7-10 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 195: Figure 7-5. Replacing The Fan
Figure 7–5. Replacing the Fan PMT Cooler and Use the following procedure to replace the PMT cooler and reaction chamber assembly (see Figure 7–6). Reaction Chamber Equipment Required: Assembly PMT cooler Replacement Wrench, 7/16-inch Wrench, 9/16-inch Thermo Fisher Scientific Model 42i Instruction Manual 7-11...
Page 196: Figure 7-6. Pmt Cooler And Reaction Chamber
To COOLER on Measurement Interface Board To BENCH on Temp. Control Board Captive Screws (4) To PMT HVPS (Two Not Shown) BNC Connector to Input Board Figure 7–6. PMT Cooler and Reaction Chamber 7-12 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 197 1. Turn instrument OFF, unplug the power cord, and remove the cover. 2. Disconnect the high voltage cable from the PMT power supply and unplug the BNC cable from the Input Board. Thermo Fisher Scientific Model 42i Instruction Manual 7-13...
Page 198: Figure 7-7. Replacing The Pmt
Adjustment” in the “Operation” chapter. PMT High Voltage Use the following procedure to replace the PMT high voltage power supply (Figure 7–8). Power Supply Equipment Required: Replacement PMT high voltage power supply 7-14 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 199: Figure 7-8. Replacing The Pmt Hvps
5. Remove the four screws securing the power supply to the bracket and remove the power supply. Assembly Bracket HVPS Input Box Screws (2) Assembly Bracket Screws (2) Input Box Assembly Figure 7–8. Replacing the PMT HVPS Thermo Fisher Scientific Model 42i Instruction Manual 7-15...
Page 200 Mode” on page 7-4, then return to the beginning of this step. ▲ 7. At the Set PMT Voltage screen, use increment/decrement the counts until the instrument displays the calibration gas concentration value. 7-16 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 201 6. Re-install the measurement bench. Refer to “Removing the Measurement Bench and Lowering the Partition Panel” in this chapter. Thermo Fisher Scientific Model 42i Instruction Manual 7-17...
Page 202: Figure 7-9. Cleaning Or Removing The Reaction Chamber
-to-NO Converter Use the following procedure to replace the converter (Figure 7–10). Replacement Equipment Required: -to-NO Converter Wrench, 7/16-inch Wrench, 9/16-inch Wrench, 1/2-inch Wrench, 5/8-inch Screwdriver Nut driver, 1/4-inch Nut driver, 5/16-inch 7-18 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 203: Figure 7-10. No -To-No Molybdenum Converter Assembly
5. Loosen the four captive screws holding converter housing to floor plate. Top Housing Assembly Heater Assembly Moly Converter Assembly Thermocouple Leads and Heater Connector Converter Bottom Housing Assembly Captive Screws (4) Figure 7–10. NO -to-NO Molybdenum Converter Assembly Thermo Fisher Scientific Model 42i Instruction Manual 7-19...
Page 204 Note electrical connections to facilitate re-connection. 3. Remove plumbing from solenoid. Note plumbing connections to facilitate re-connection. 4. Pull solenoid valve from mounting clip. 5. To replace solenoid, follow previous steps in reverse. 7-20 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 205: Figure 7-11. Replacing The Solenoid Valve
▲ 1. Refer to “Removing the Measurement Bench and Lowering the Partition Panel” in this chapter to lower the partition panel, then proceed to the next step below. Thermo Fisher Scientific Model 42i Instruction Manual 7-21...
Page 206: Figure 7-12. Replacing The Ozonator Assembly
5. Remove the two screws securing the ozonator to the ozonator bracket. 6. Unplug the ozonator from the ozonator transformer by lifting the ozonator straight up. 7. To install the ozonator, follow the previous steps in reverse. 7-22 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 207 Input board Philips screwdriver Equipment Damage Some internal components can be damaged by small amounts of static electricity. A properly ground antistatic wrist strap must be worn while handling any internal component. ▲ Thermo Fisher Scientific Model 42i Instruction Manual 7-23...
Page 208: Figure 7-13. Replacing The Input Board
7. Re-install the measurement bench. Refer to “Removing the Measurement Bench and Lowering the Partition Panel” in this chapter. 8. Perform an input board calibration. See the “Input Board Calibration” procedure that follows. 7-24 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 209 The screen flashes Calculating - Please Wait! and Done - Values Saved! messages. DC Power Supply Use the following procedure to replace the DC power supply (Figure 7– 14). Replacement Equipment Required: DC power supply Philips screwdriver Thermo Fisher Scientific Model 42i Instruction Manual 7-25...
Page 210: Figure 7-14. Replacing The Dc Power Supply
To check the analog Testing outputs, you connect a meter to an analog output channel (voltage or current) and compare the meter reading with the output value set on the Test Analog Outputs screen. 7-26 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 211: Figure 7-15. Rear Panel Analog Input And Output Pins
The Set Analog Outputs screen appears. 4. Press to set the output to zero. The Output Set To line displays Zero. Thermo Fisher Scientific Model 42i Instruction Manual 7-27...
Page 212: Table 7-4. Analog Output Channels And Rear Panel Pin Connections
Ground 16, 18, 19, 35, 37 Current Output Return 13, 16, 18, 20, 22, 24 Table 7–5. Analog Input Channels and Rear Panel Pin Connections Input Channel Ground 4, 8, 11, 14 7-28 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 213 7. Press to select Calibrate Full-Scale. 8. Use until the meter reads the value shown in the Set Output To line, then press to save the value. Thermo Fisher Scientific Model 42i Instruction Manual 7-29...
Page 214 “Calibrating the Input Channels to Full-Scale” procedure that follows. Calibrating the Input Use the following procedure to calibrate the input channels to full scale by applying a known voltage to the channels. Channels to Full-Scale 7-30 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 215 Equipment Damage Some internal components can be damaged by small amounts of static electricity. A properly ground antistatic wrist strap must be worn while handling any internal component. ▲ 1. Turn instrument OFF, unplug the power cord, and remove the cover. Thermo Fisher Scientific Model 42i Instruction Manual 7-31...
Page 216: Figure 7-16. Replacing The Pressure Transducer
Calibration” procedure that follows. Pressure Transducer Use the following procedure to calibrate the pressure transducer. Calibration Equipment Required: Vacuum pump WARNING The service procedures in this manual are restricted to qualified service representatives. ▲ 7-32 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 217 4. At the Pressure Sensor Cal menu, press to select Zero. The Calibrate Pressure Zero screen appears. 5. Wait at least 10 seconds for the zero reading to stabilize, then press to save the zero pressure value. Thermo Fisher Scientific Model 42i Instruction Manual 7-33...
Page 218 CONV TC cable. Note that the red wire is towards the rear and the yellow wire is towards the front. 3. Snap off the board from the board mounts. 4. To install the temperature control board, follow previous steps in reverse. 7-34 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 219 Temperature Calibration > and press The Calibrate Ambient Temperature screen appears. Note If Service Mode is not displayed, refer to “Accessing the Service Mode” on page , then return to the beginning of this step. ▲ Thermo Fisher Scientific Model 42i Instruction Manual 7-35...
Page 220 ▲ 1. Turn instrument OFF, unplug the power cord, and remove the cover. 2. Unscrew the Teflon tubing at both ends of the scrubber. 3. Pull the scrubber off the mounting clips. 7-36 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 221: Figure 7-17. Replacing The Scrubber
▲ 1. Turn instrument OFF, unplug the power cord, and remove the cover. 2. Unplug the I/O expansion board cable from the EXPANSION BD connector on the motherboard. Thermo Fisher Scientific Model 42i Instruction Manual 7-37...
Page 222: Figure 7-18. Replacing The I/O Expansion Board (Optional)
Motherboard Support Bracket Mounting Studs Motherboard Digital Output Board I/O Expansion Board (Opt) Figure 7–18. Replacing the I/O Expansion Board (Optional) I/O Expansion Board Motherboard Digital Output Board Figure 7–19. Rear Panel Board Connectors 7-38 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 223 Nut driver, 3/16-inch Equipment Damage Some internal components can be damaged by small amounts of static electricity. A properly ground antistatic wrist strap must be worn while handling any internal component. ▲ Thermo Fisher Scientific Model 42i Instruction Manual 7-39...
Page 224 1. Lower the partition panel, then proceed to the next step below. Refer to “Removing the Measurement Bench and Lowering the Partition Panel” on page in this chapter. 2. Unplug all connectors. Note the locations of the connectors to facilitate reconnection. 7-40 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 225: Figure 7-20. Replacing The Measurement Interface Board
Equipment Damage Some internal components can be damaged by small amounts of static electricity. A properly ground antistatic wrist strap must be worn while handling any internal component. ▲ 1. Turn instrument OFF, unplug the power cord, and remove the cover. Thermo Fisher Scientific Model 42i Instruction Manual 7-41...
Page 226: Figure 7-21. Replacing The Flow Transducer
Calibration” procedure that follows. Flow Transducer Use the following procedure to calibrate the flow transducer. Calibration Equipment Required: Calibrated flow sensor WARNING The service procedures in this manual are restricted to qualified service representatives. ▲ 7-42 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 227 7. Connect a calibrated flow sensor at the SAMPLE bulkhead on the rear panel. 8. Press to return to the Flow Sensor Cal menu. 9. At the Flow Sensor Cal menu, press to select Span. The Calibrate Flow Span screen appears. Thermo Fisher Scientific Model 42i Instruction Manual 7-43...
Page 228 3. Pop off the board from the two top mounting studs and remove the board by lifting it up and off the slotted bottom support. 4. Replace the front panel board by following previous steps in reverse. 7-44 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 229: Figure 7-22. Replacing The Front Panel Board And The Lcd Module
▲ Do not remove the LCD panel or frame from the LCD module. ▲ The LCD polarizing plate is very fragile, handle it carefully. ▲ Thermo Fisher Scientific Model 42i Instruction Manual 7-45...
Page 230 For additional assistance, service is available from exclusive distributors worldwide. Contact one of the phone numbers below for product support and technical information or visit us on the web at www.thermo.com/aqi. 1-866-282-0430 Toll Free 1-508-520-0430 International 7-46 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 231 “Hardware” on page ● “Software” on page ● “Electronics” on page ● “I/O Components” on page ● Hardware Model 42i hardware components (Figure 8–1) include: -to-NO converter ● Mode solenoid ● Reaction chamber ● Optical filter ● Pressure transducer ●...
Page 232: Figure 8-1. Hardware Components
The reaction chamber is heated and controlled to approximately 50 °C in order to ensure the greatest instrument stability. The sample and ozone flow capillaries and a thermistor sensor are also housed in/on the reaction chamber assembly. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 233 Pump The vacuum pump draws the reacted gasses out of the reaction chamber. Sample Capillary The sample capillary along with the pump is used to control flow in the sample line. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 234 (no additional signal conditioning is performed by the high-level processor). In auto mode, every ten seconds the NO/NO solenoid switches and the processor waits three seconds for the reaction chamber to flush and Model 42i Instruction Manual Thermo Fisher Scientific...
Page 235 Negative concentrations can be represented as long as they are within -5% of full-scale. The zero and span values may be set by the user to any desired value. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 236 I/O connector with Power Fail Relay, 16 Digital Inputs, and 6 Analog ● Voltage Outputs. Internal Connectors Internal connectors include: Function key panel and Display ● Measurement Interface Board Data ● I/O Expansion Board Data ● Digital Output Board ● AC distribution ● Model 42i Instruction Manual Thermo Fisher Scientific...
Page 237 The pressure transducer output is produced by measuring the pressure difference between the sample gas pressure and ambient air pressure. Temperature Control The temperature control board regulates and sets the temperature of the reaction chamber and converter. Board Thermo Fisher Scientific Model 42i Instruction Manual...
Page 238 It contains local power supplies, a DC/DC isolator supply, a sub-processor and analog circuits. Eight analog voltage inputs are provided with an input Model 42i Instruction Manual Thermo Fisher Scientific...
Page 239 The analog outputs may be assigned to any measurement or diagnostic channel with a user-defined range in the units of the selected parameter. The voltage outputs are independent of the current outputs. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 240 Digital Inputs Sixteen digital inputs are available which may be programmed to signal instrument modes and special conditions including: NO Measure Mode ● Measure Mode ● Zero Gas Mode ● 8-10 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 241 Data Format: 1200, 2400, 4800, 9600, 19200, 38400, 57600, or 115200 BAUD 7 or 8 data bits 1 or 2 stop bit No, odd, or even parity Thermo Fisher Scientific Model 42i Instruction Manual 8-11...
Page 242: Table 8-1. Rs-232 Db9 Connector Pin Configurations
Any serial port protocols may be accessed over Ethernet in addition to the serial port. Up to three simultaneous connections are allowed per protocol. External Accessory The external accessory connector is not used in the Model 42i analyzer. Connector This port is used in other models to communicate with smart external devices that may be mounted hundreds of feet from the analyzer using an RS-485 electrical interface.
Page 243 Chapter 9 Optional Equipment The Model 42i is available with the following options: “Internal Zero/Span and Sample Valves” on page ● “Internal Permeation Span Source” on page ● “Ozonator Permeation Dryer” on page 9-10 ● “Sample Permeation Dryer” on page 9-10 ●...
Page 244: Figure 9-1. Flow Diagram, Zero/Span Option
Assurance Handbook for Air Pollution Measurement Systems (Volume II). Figure 9–2 shows how this option is integrated with the Model 42i components. Energizing the sample valve V1 shuts off the sample flow and permits the flow of zero air for analysis. When valves V1 and V2 are...
Page 245: Figure 9-2. Flow Diagram, Internal Permeation With Zero/Span Valve
Note Keep the glass clean when handling it. ▲ 4. Place the permeation tube(s) in the glass chamber. 5. Attach the glass chamber to the top assembly by gently pushing the two together with a slight twisting motion. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 246 1. Physically install the permeation oven and valves into the instrument and connect the cables and plumbing. 2. From the Perm Oven Settings menu in the Service menu, select Perm Oven Selection, then select 45 °C. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 247 15. Go to the High Point screen, enter the exact value of the resistor and press to calibrate the high resistance point. 16. Press to return to the Factory Cal Oven Therm menu. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 248 1. Unplug POJ3 from the measurement interface board. Place a 4.369 K resistor across pins 3 and 4 on the board. 2. In the Main Menu, choose Service > Perm Oven Settings > Cal Oven Thermistor. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 249 Thermistor > Water Bath. CAL GAS THERM (BATH): CURRENTLY: 45.80 SET TO: 45.00  MOVE CURSOR  CHANGE VALUE  SAVE RANGE DIAGS ALARM 4. Enter the thermistor temperature from the thermometer and press Thermo Fisher Scientific Model 42i Instruction Manual...
Page 250 5. Remove the resistor and reconnect the gas thermistor. 6. Make sure the source of zero air is connected to the ZERO bulkhead on the rear panel. 7. Wait for the permeation gas temperature reading to stabilize. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 251 Calibration” procedure described previously. Also make sure that the Transfer Standard has been properly calibrated. 2. Determine the permeation rate for the permeation tube in the Transfer Standard, or install a certified permeation tube. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 252 5. Switch the calibrated 42i into the span mode. 6. Measure the flow rate into the ZERO bulkhead on the rear panel of the 42i. Be sure that the source of zero air is connected. Note the flow and measured NO concentration.
Page 253 - especially in a situation where the sample is changing rapidly, e.g., an urban traffic environment. The Model 42i stores the NO signal obtained during the first half of the solenoid cycle, determines the NO signal during the second half of the...
Page 254: Figure 9-3. Flow Diagram, Lag Volume
Figure 9–3. Flow Diagram, Lag Volume Lag Volume Test Use the following procedure to test the Model 42i with lag volume option. 1. Set the NO range to 1,000 ppb and the averaging time to 10 seconds. 2. Introduce approximately 800 ppb NO into the Model 42i. Wait for a stable reading and then record the NO reading.
Page 255 Filter before passing through the capillary and reaction chamber. -to-NO Converter The Model 42i includes a Molybdenum NO -to-NO converter as standard equipment. A stainless steel converter is available as an option. I/O Expansion Board The I/O expansion board provides six analog current output channels (0- 20 mA or 4-20 mA) and eight analog voltage inputs (0-10V).
Page 256: Table 9-1. Cable Options
End color codes for 25-pin cables continue for 37-pin cables. VIOLET PINK/GREEN GRAY PINK/RED WHITE PINK/VIOLET PINK LIGHT BLUE LIGHT GREEN LIGHT BLUE/BROWN BLACK/WHITE LIGHT BLUE/RED BROWN/WHITE LIGHT BLUE/VIOLET RED/WHITE LIGHT BLUE/BLACK 9-14 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 257: Table 9-3. Mounting Options
EIA-rack mounting handles. This configuration is intended for direct replacement of a C-series instrument in an existing rack. The rail mounting location is lower on the case and the front mounting screw slots are in non-standard EIA locations. Thermo Fisher Scientific Model 42i Instruction Manual 9-15...
Page 258: Figure 9-1. Bench Mounting
Optional Equipment Mounting Options Figure 9–1. Bench Mounting 9-16 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 259: Figure 9-2. Eia Rack Mounting
Optional Equipment Mounting Options Figure 9–2. EIA Rack Mounting Thermo Fisher Scientific Model 42i Instruction Manual 9-17...
Page 260: Figure 9-3. Retrofit Rack Mounting
Optional Equipment Mounting Options Figure 9–3. Retrofit Rack Mounting 9-18 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 261: Figure 9-4. Rack Mount Option Assembly
Optional Equipment Mounting Options Figure 9–4. Rack Mount Option Assembly Thermo Fisher Scientific Model 42i Instruction Manual 9-19...
Page 263 (i) normal wear and tear, (ii) accident, disaster or event of force majeure, (iii) misuse, fault or negligence of or by Buyer, (iv) use of the Products in a manner for which Thermo Fisher Scientific Model 42i Instruction Manual...
Page 264 OR WRITTEN, WITH RESPECT TO THE PRODUCTS, INCLUDING WITHOUT LIMITATION ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. SELLER DOES NOT WARRANT THAT THE PRODUCTS ARE ERROR-FREE OR WILL ACCOMPLISH ANY PARTICULAR RESULT. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 265 C-Link Protocol Commands This appendix provides a description of the C-Link protocol commands that can be used to remotely control a Model 42i analyzer using a host device such as a PC or a datalogger. C-Link protocol may be used over RS- 232, RS-485, or Ethernet.
Page 266 (ASCII) character. The command in the example below begins with the ASCII character code 170 decimal, which directs the command to the Model 42i, and is terminated by a carriage return “CR” (ASCII character code 13 decimal). <ASCII 170> T I M E <CR>...
Page 267: Table B-1. Error Response Messages
B-43 addr nm Reports/sets netmask address for Ethernet port B-44 addr ntp Reports the IP address for network time protocol server B-44 alarm chamber Reports/sets chamber temperature alarm maximum value B-14 temp max Thermo Fisher Scientific Model 42i Instruction Manual...
Page 268 Retrieves analog voltage input data per channel B-50 analog vout range Reports/sets analog voltage output range per channel B-50 avg time Reports/sets averaging time B-10 baud Reports/sets current baud rate B-44 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 269 Sets/copies current srec selection into the scratch pad B-25 copy stream to sp Sets/copies current streaming data selection into the scratch B-25 custom Reports/sets defined custom range concentration B-36 Thermo Fisher Scientific Model 42i Instruction Manual...
Page 270 Reports/sets high range averaging time B-10 high no Reports NO concentration calculated with high range B-11 coefficients high no coef Reports/sets high range NO coefficients B-27 high no gas Reports/sets high range NO span gas concentration B-28 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 271 Reports/sets low range NO coefficient B-27 low no gas Reports/sets low range NO span gas concentration B-28 low no2 Reports NO concentration calculated with low range B-11 coefficients low no2 coef Reports/sets low range NO coefficient B-27 Thermo Fisher Scientific Model 42i Instruction Manual...
Page 272 B-24 no of srec Reports/sets number of short records stored in memory B-24 Reports current NO concentration B-11 no2 coef Reports/sets current NO coefficient B-27 no2 gas Reports/sets NO span gas concentration B-28 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 273 Stores parameters in FLASH B-42 sc (screen) C-series legacy command that reports a generic response B-34 (Use iscreen instead) sp field Reports/sets item number and name in scratch pad list B-25 Thermo Fisher Scientific Model 42i Instruction Manual...
Page 274 The example below shows that the averaging time is 300 seconds, according to Table B–2. B-10 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 275: Table B-2. Averaging Times
These commands report the measured NO, NO , and NO concentrations when operating in single range, or high and low NO, NO , and NO when Thermo Fisher Scientific Model 42i Instruction Manual B-11...
Page 276 This command reports the current permeation gas temperature. The example below reports that the permeation gas temperature is 45 °C. Send: perm gas temp Receive: perm gas temp 45 deg C B-12 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 277 In the example below, the instrument is reporting that the ozonator and PMT are both on, and that the instrument is in the span gas mode. Send: flags Receive: flags 80028000 Thermo Fisher Scientific Model 42i Instruction Manual B-13...
Page 278: Figure B-1. Flags
C. The example below sets the chamber temperature alarm maximum value to 50.0 °C. Send: set alarm chamber temp max 50.0 Receive: set alarm chamber temp max 50.0 ok B-14 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 279 C. The example below sets the converter temperature alarm maximum value to 340.0 °C. Send: set alarm converter temp max 340 Receive: set alarm converter temp max 340 ok Thermo Fisher Scientific Model 42i Instruction Manual B-15...
Page 280 These commands report the pressure alarm minimum and maximum value current settings. The example below reports that the pressure alarm minimum value is 150 mmHg. Send: alarm pressure min Receive: alarm pressure min 150 mmHg B-16 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 281 , and NO concentration alarm minimum value, where value is set to either floor or ceiling, according to Table B–3. The example below sets the NO concentration minimum alarm trigger to ceiling. Thermo Fisher Scientific Model 42i Instruction Manual B-17...
Page 282: Table B-3. Alarm Trigger Values
Send: version Receive: version Program = 01.05.79.225 Library = 01.01.60.167 Kernal = 2.4.24-uc0-003-Thermo Board = 81, File = /usr/application.hex Board App = 11.3.100 BI 4.0.97 File App = 11.3.100 BI 4.0.97 B-18 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 283 These commands report the current selection for the digital outputs in the format. Output no Index number variable name active state. The active state for digital outputs is open or closed. The active state for digital inputs is high or low. Thermo Fisher Scientific Model 42i Instruction Manual B-19...
Page 284 In the example below, the command requests a long record with no checksum, in ASCII format with text. For details on how to decode the flag fields within these records, see the “flags” command. Send: lr01 Receive: lr01 B-20 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 285 In single range the low NO and low NO values are set to 0 and the high NO and high NO are used. In NO or NO only mode, the pertinent high value used, other Thermo Fisher Scientific Model 42i Instruction Manual B-21...
Page 286 ASCII without text, ASCII with text, or binary. The example below shows the output format for long records is ASCII with text, according to Table B–4. B-22 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 287: Table B-4. Record Output Formats
241979. Memory allocation can be changed using the malloc command. Send: lrec mem size Receive: lrec mem size 241979 recs, 1075 blocks Thermo Fisher Scientific Model 42i Instruction Manual B-23...
Page 288 The example below sets the memory allocation for long records to Note Issuing these commands will clear all the logging data memory. All the existing records should be retrieved using appropriate commands, if required. ▲ B-24 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 289 The following example shows that field 5 in the scratch pad is set to index number 13, which is for the variable pressure. Thermo Fisher Scientific Model 42i Instruction Manual B-25...
Page 290 This command enables value, where value is to attach or disable time stamp to streaming data string, according to Table B–5. The example below attaches a time stamp to streaming data. Send: set stream time 0 Receive: set stream time 0 ok B-26 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 291: Table B-5. Stream Time Values
Receive: set cal low no coef ok no coef no2 coef nox coef high no coef high no2 coef high nox coef low no coef low no2 coef low nox coef Thermo Fisher Scientific Model 42i Instruction Manual B-27...
Page 292 NO low span gas concentration is 240.0 ppb. Send: low no gas Receive: low no gas 2400E-1 ppb set no gas value set no2 gas value set nox gas value set high no gas value B-28 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 293 5000 ok set cal perm gas offset temp temp This command calibrates the permeation gas temperature sensor offset to a temperature of temp in degrees C. Thermo Fisher Scientific Model 42i Instruction Manual B-29...
Page 294 This command reports that the span cal reset is on or off. The following example reports that the span cal reset it on. Send: span cal reset Receive: span cal reset on B-30 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 295 15 ok zero dur This command reports the zero duration. The following example reports that the zero duration is 10 minutes. Send: zero dur Receive: zero dur 10 min Thermo Fisher Scientific Model 42i Instruction Manual B-31...
Page 296 This command sets the zero/span averaging time, according to Table B–2. The following example sets the zero/span averaging time to 120 seconds. Send: set zs avg time 8 Receive: set zs avg time 8 ok B-32 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 297 It is sent as a type '5' binary C-Link response with no checksum. The RLE encoding consists of a 0 followed by an 8-bit count of consecutive 0xFF bytes. The following 'c' code will expand the incoming data. Thermo Fisher Scientific Model 42i Instruction Manual B-33...
Page 298 This command is meant for backward compatibility on the C series. Screen information is reported using the “iscreen” command above. Send: screen Receive: screen This is an I series Instrument. Screen Information not available B-34 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 299: Table B-6. Standard Ranges
5 ok Table B–6. Standard Ranges Selection μgm 0.05 0.10 0.20 0.50 1,000 1,000 1.00 2,000 2,000 2.00 5,000 5,000 5.00 10,000 10.0 10,000 10.00 20,000 20.0 20,000 20.00 30,000 30.0 Thermo Fisher Scientific Model 42i Instruction Manual B-35...
Page 300: Table B-7. Extended Ranges
1, 2, or 3 to range value, where value is a floating-point number representing concentration in ppb ppm, μg/m or mg/m . The example below sets the custom 1 range to 55.5 ppb. B-36 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 301 These commands set the zero/span valves to the span mode. The example below sets the instrument to span mode that is, the instrument is sampling span gas. Thermo Fisher Scientific Model 42i Instruction Manual B-37...
Page 302 These commands turn the pressure compensation on or off. The example below turns pressure compensation off. Send: set pres comp off Receive: set pres comp off ok B-38 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 303: Table B-8. Contrast Levels
This command sets the screen’s level of contrast, according to Table B–8. The example below sets the contrast level to 50%. Send: set contrast 10 Receive: set contrast 10 ok Table B–8. Contrast Levels Contrast Level Level Thermo Fisher Scientific Model 42i Instruction Manual B-39...
Page 304 = year This command sets the date of the analyzer’s internal clock. The example below sets the date to December 1, 2004. Send: set date 12-01-04 Receive: set date 12-01-04 ok B-40 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 305 This command reports the status of the ozonator and safety. The example below reports that the ozonator is off. Send: ozonator status Receive: ozonator status off Thermo Fisher Scientific Model 42i Instruction Manual B-41...
Page 306 This command sets the internal clock (24-hour time). The example below sets the internal time to 2:15 pm. Note If seconds are omitted, the seconds default to 00. ▲ Send: set time 14:15 Receive: set time 14:15 ok B-42 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 307 Note This command cannot be used when DHCP is on. Refer to the DHCP command that follows for additional information. ▲ Send: set addr ip 192.168.1.15 Receive: set addr ip 192.168.1.15 ok Thermo Fisher Scientific Model 42i Instruction Manual B-43...
Page 308 This command sets the instrument baud rate. The example below sets the instrument’s baud rate to 9600. Note After the command is sent, the baud rate of the sending device must be changed to agree with the instrument. ▲ B-44 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 309 This command sets the reply termination format, where format is set according to Table B–9. The example below sets the reply termination format to checksum. Send: set format 01 Receive: set format 01 ok Thermo Fisher Scientific Model 42i Instruction Manual B-45...
Page 310: Table B-9. Reply Termination Formats
This command sets the instrument id to value, where value is a decimal number between 0 and 127 inclusive. Note Sending this command via RS-232 or RS-485 will require the host to use the new id for subsequent commands. ▲ B-46 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 311 “ok” response). Note The instrument will always respond to the command “mode” with the status of the password lock as “mode local” or “mode remote” regardless of the above setting. ▲ Thermo Fisher Scientific Model 42i Instruction Manual B-47...
Page 312: Table B-10. Allow Mode Command Values
Table B–11. Power Up Mode Values Power Up Mode Command Value Local/Unlocked (default) Remote/Locked Mode program no This command reports the analyzer’s model information and program version number, which will be dependant on the current version. B-48 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 313: Table B-12. Set Layout Ack Values
I/O Configuration Send: program no Receive: program no iSeries 42i 01.00.01.074 set layout ack This command reports the stale layout/layout change indicator (*) that is attached to each response if the erec layout has changed since the last time erec layout was requested, according to Table B–12.
Page 314: Table B-13. Analog Current Output Range Values
This command sets analog voltage output channel to the range, where channel is between 1 and 6 inclusive, and range is set according to Table B– 14. The example below sets channel 2 to the 0-10 V range. B-50 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 315: Table B-14. Analog Voltage Output Range Values
This command reports the index number, output variable and the active state assigned to digital output channel. The following example reports output 4 to be assigned an index number 11 corresponding to action of “general alarm”. Thermo Fisher Scientific Model 42i Instruction Manual B-51...
Page 316: Table B-15. Default Output Assignment
High/Low NO Current Output High NO High/Low NO Current Output Not Used Low NO Range (NO Current Output Not Used Low NO Not Used Current Output Not Used Low NO Not Used B-52 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 317 = index of first register (must be odd number), count = number of registers to report (must be even), each pair of registers is reported as a float. Thermo Fisher Scientific Model 42i Instruction Manual B-53...
Page 318 1 logic to normally open. Note If the command is sent without an appended relay number then all the relays are assigned the set logic of normally open/closed. ▲ B-54 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 319 %x - parse a hexadecimal number %lx - parse a long (32-bit) hex number %* - ignore the field Note Signed versus unsigned for the integer values does not matter; it is handled automatically. ▲ Thermo Fisher Scientific Model 42i Instruction Manual B-55...
Page 320 The first field in the layout string is the text. It is delimited by a ':'. The string up to the first ':' will be read and inserted in the text field of the line. B-56 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 321 Selection Table Then there appears an optional selection table within parentheses '(...)'. This is a string of numbers separated by spaces '(0 1)'. The selection table Thermo Fisher Scientific Model 42i Instruction Manual B-57...
Page 322 If a ‘|’ is present, it indicates a command which is sent to the instrument upon successful completion of the button command to update the value field. This is not currently used. B-58 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 323 There is a no-translation button which creates a selection list of twelve "Code nn" options. The number of the user selection is used to create the output command. Thermo Fisher Scientific Model 42i Instruction Manual B-59...
Page 324 The background value is taken from the 7th element, and the precision specifier is taken from the 8th. If the asterisk were not present, it would indicate instead that 8 digits after the decimal point should be displayed. B-60 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 325 Parameters Number of Data bits : 7 or 8 Number of Stop bits : 1 or 2 Parity : None, Odd, or Even Data rate : 1200 to 115200 Baud (9600 is default) Thermo Fisher Scientific Model 42i Instruction Manual...
Page 326 0x0000 to 0xFFFF (Passed back in response) Protocol Identifier 2 Bytes 0x00 (MODBUS protocol) Length 2 Bytes 0x0000 to 0xFFFF (Number of following bytes) Unit Identifier 1 Byte 0x00 to 0xFF (Passed back in response) Model 42i Instruction Manual Thermo Fisher Scientific...
Page 327 These requests specify the starting address, i.e. the address of the first output specified, and the number of outputs. The outputs are addressed starting at zero. Therefore, outputs numbered 1–16 are addressed as 0–15. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 328 Function code 1 Byte 0x01 or 0x02 Exception code 1 Byte 01=Illegal Function, 02=Illegal Address, 03=Illegal Data, 04=Slave Device Failure Here is an example of a request and response to read outputs 2–15: Model 42i Instruction Manual Thermo Fisher Scientific...
Page 329 For each register, the first byte contains the high order bits and the second contains the low order bits. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 330 No. of Registers Hi 0x00 No. of Registers Lo 0x04 Response Field Name (Hex) Function 0x03 Byte Count 0x06 Register value Hi (10) 0x02 Register value Lo (10) 0x2B Register value Hi (11) 0x00 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 331 Response Function code 1 Byte 0x05 Starting Address 2 Bytes 0x0000 to maximum allowed by instrument Output Value 2 Bytes 0x0000 or 0xFF00 Error Response Function code 1 Byte Function code + 0x80 Thermo Fisher Scientific Model 42i Instruction Manual...
Page 332: Table C-1. Read Coils For 42I
▲ Note Coil status 1 indicates active state. ▲ Table C–1. Read Coils for 42 i Coil Number Status NOT USED AUTORANGE (NOx) LOCAL/REMOTE Model 42i Instruction Manual Thermo Fisher Scientific...
Page 333 Perm Span Option PRESSURE ALARM FLOW ALARM Bypass Flow Option OZONE FLOW ALARM MOTHERBOARD STATUS ALARM INTERFACE BD STATUS ALARM I/O EXP BD STATUS ALARM I/O Expansion Board Option NOT USED CONC ALARM SAMPLE MODE Thermo Fisher Scientific Model 42i Instruction Manual...
Page 334 IMPORTANT NOTE The addresses in the following tables are Protocol Data Unit (PDU) addresses. Verify the register number on your MODBUS master to ensure that it matches the register number on the instrument. ▲ C-10 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 335: Table C-2. Read Registers For 42I
PERM OVEN GAS Perm Span Option 47 & 48 PERM OVEN HEATER Perm Span Option 49 & 50 CHAMBER PRESSURE 51 & 52 SAMPLE FLOW Bypass Flow Option 53 & 54 PMT VOLTS Thermo Fisher Scientific Model 42i Instruction Manual C-11...
Page 336 111 & 112 O2 % Internal O Sensor Option 113 & 114 O2 SENS TEMP Internal O Sensor Option 115 & 116 NOT USED 117 & 118 NOT USED 119 & 120 NOT USED C-12 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 337: Table C-3. Write Coils For 42I
CAL TO LO SPAN AOUTS TO ZERO Analog Out Test I/O Expansion Board Option AOUTS TO FS Analog Out Test I/O Expansion Board Option CAL TO HI SPAN NOT USED NOT USED Thermo Fisher Scientific Model 42i Instruction Manual C-13...
Page 338 Reading a Write Coil To read a write coil, issue a read coil command for that coil. For example, to view the state of write coil 101, issue a “read coil 101”. C-14 Model 42i Instruction Manual Thermo Fisher Scientific...
Page 339 This is achieved by using the supported Geysitech commands listed below. For details of the Model 42i Geysitech Protocol specification, see the following topics: “Serial Communication Parameters” on page ●...
Page 340 If a command is terminated with <ETX>, then two additional characters <BCC> is attached after <ETX>. This is the block checksum. Block Checksum Characters <BCC> may be added to the command to prevent processing invalid commands. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 341 Command ‘K’ switches the instrument gas mode to Span mode. Command ‘M’ switches the instrument gas mode to Sample mode. The following are the different acceptable formats of the ST command: <STX>ST<address><control command><ETX><BCC> <STX>ST<address><control command><CR> <STX>ST<address><SP><control command><CR> <STX>ST<address><SP><control command><ETX><BCC> Thermo Fisher Scientific Model 42i Instruction Manual...
Page 342 <STX> which is followed by the characters DA, and the <address> (if present) matches the Instrument Address, and the command is terminated with either <CR> with no checksum or <ETX> followed by the correct checksum <BCC>. Model 42i Instruction Manual Thermo Fisher Scientific...
Page 343 For details on how to interpret the status bytes refer to Table D–1 Table D–2 below. <SFKT>: is the space provided for future use for special function, it currently contains a string of ten 0’s i.e. <0000000000>. Thermo Fisher Scientific Model 42i Instruction Manual...
Page 344 NO ● low NO ● high NO ● high NO ● high NO ● Operating and Error Table D–1 for operating status and Table D–2 for error status for the Model 42i. Status Model 42i Instruction Manual Thermo Fisher Scientific...
Page 345: Table D-1. Operating Status For Model 42I
Table D–2. Error Status for Model 42 i  Bit  Hex-value Error status: Not Used Not Used Not Used Any Temperature Alarm Pressure Alarm Sample Flow Alarm Ozonator Flow Alarm Not used Thermo Fisher Scientific Model 42i Instruction Manual...

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