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TELEDYNE API N400 User Manual

Photometric ozone analyzer
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Photometric Ozone Analyzer
© Teledyne API (TAPI)
9970 Carroll Canyon Road
San Diego, California
92131-1106
USA
Part Number 092910400F DCN8928
User Manual
Model N400
Toll-free Phone:
+1 800-324-5190
Phone:
+1 858-657-9800
Fax:
+1 858-657-9816
Email:
api-sales@teledyne.com
Website:
http://www.teledyne-api.com
13 February 2025

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Summary of Contents for TELEDYNE API N400

  • Page 1 User Manual Model N400 Photometric Ozone Analyzer © Teledyne API (TAPI) Toll-free Phone: +1 800-324-5190 9970 Carroll Canyon Road Phone: +1 858-657-9800 San Diego, California Fax: +1 858-657-9816 92131-1106 Email: api-sales@teledyne.com Website: http://www.teledyne-api.com Part Number 092910400F DCN8928 13 February 2025...
  • Page 3 NOTICE OF COPYRIGHT © 2025 Teledyne API (TAPI). All rights reserved. TRADEMARKS All trademarks, registered trademarks, brand names or product names appearing in this document are the property of their respective owners and are used herein for identification purposes only.
  • Page 4 Technician Symbol: All operations marked with this symbol are to be performed by qualified maintenance personnel only. Electrical Ground: This symbol inside the instrument marks the central safety grounding point for the instrument. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 5 Note that the safety of a system that may incorporate this product is the end user’s responsibility. For Technical Assistance regarding the use and maintenance of this instrument or any other Teledyne API product, contact Teledyne API’s Technical Support Department: Telephone: +1 800-324-5190 (toll free) or +1 858-657-9800 Email: api-techsupport@teledyne.com or access any of the service options on our website at http://www.teledyne-api.com/...
  • Page 6 être effectuées uniquement par du personnel de maintenance qualifié. Mise à la terre : Ce symbole à l’intérieur de l’instrument détermine le point central de la mise à la terre sécuritaire de l’instrument. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 7 Risque d’explosion et d’incendie Techniques de manutention, Blessure corporelle soulevage et de transport inappropriées Notez que la sécurité d’un système qui peut incorporer ce produit est la responsabilité de l’utilisateur final. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 8 PRODUCT RETURN All units or components returned to Teledyne API should be properly packed for handling and returned freight prepaid to the nearest designated Service Center. After the repair, the equipment will be returned, freight prepaid.
  • Page 9 Provides information about that which could either affect accuracy of instrument readings or cause loss of data. Provides information pertinent to the proper care, NOTE operation or maintenance of the instrument or its parts. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 10 2.5.2.1 Editing or Deleting Events ....................53 2.5.2.2 Using Events as Triggers for Data Logging...............54 2.5.3 Setup>Dashboard ..........................54 2.5.4 Setup>AutoCal (with Valve Option) ....................54 2.5.5 Setup>Vars ............................55 2.5.6 Setup>Homescreen .........................56 2.5.7 Setup>Digital Outputs (Option) ......................57 viii Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 11 5.6.4 Performing a Sample Flow Check ....................92 5.6.5 Maintaining the Photometer Absorption Tube..................92 5.6.6 Replacing the Optical Bench UV Lamp ....................93 5.6.7 Adjusting or Replacing the IZS Ozone Generator Option’s UV Lamp ..........94 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 12 6.2.1 Sample Gas Air Flow ........................118 6.2.2 Flow Rate Control ..........................119 6.2.3 Particulate Filter ..........................120 6.2.4 Pneumatic Sensors ........................120 6.2.4.1 Sample Pressure Sensor....................120 6.2.4.2 Sample Flow Sensor .......................120 6.3 Electronic Operation ..........................120 6.3.1 Modules ............................120 Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 13 Figure 2-9. Gas Line Connections for the N400 Analyzer with IZS Option ..............31 Figure 2-10. Gas Line Connections when the N400 Analyzer is Located in the Room Being Monitored ....32 Figure 2-11. Gas Line Connections when the N400 Analyzer is Monitoring a Remote Location ......33 Figure 2-12.
  • Page 14 Table 2-13. Setup>Instrument Menu ........................62 Table 2-14. COM Port Configuration ........................63 Table 2-15. LAN/Ethernet Configuration Properties ....................64 Table 3-1. Teledyne API's Hessen Protocol Response Modes ................68 Table 3-2. Hessen List Configuration Summary .......................69 Table 3-3. REST Resource Descriptions .........................69 Table 3-4. Ethernet Status Indicators ........................70 Table 4-1.
  • Page 15 In the N400 the intensity of an ultraviolet light is measured after it passes through a chamber, called the sample cell, where it is absorbed in proportion to the amount of ozone present.
  • Page 16 SPECIFICATIONS Table 1-1. N400 Basic Unit Specifications PARAMETER SPECIFICATION Ranges Min: 0-100 ppb Full scale Max: 0-10,000 ppb Full scale (selectable, dual range supported) Measurement Units ppb, ppm, µg/m , mg/m (selectable) Zero Noise < 0.2 ppb (RMS) (with 80 Sample Digital Filter) Span Noise <...
  • Page 17 < 5 min to 95% EPA DESIGNATION Teledyne API’s Model N400 photometric ozone analyzer is officially designated as US EPA Federal Equivalent Method (FEM), Designation Number EQOA-0992-087 for O3 measurement. The official “List of Designated Reference and Equivalent Methods” is published in the U.S.
  • Page 18 Do not operate this instrument without first removing dust plugs from SAMPLE and EXHAUST ports on the rear panel. Note Teledyne API recommends that you store shipping containers and materials for future use if/when the instrument should be returned to the factory for repair and/or calibration service. See Warranty statement in this manual and Return Merchandise Authorization (RMA) on our Website at http://www.teledyne-api.com.
  • Page 19 Sides of the instrument 2.5 cm / 1 in Above and below the instrument 2.5 cm / 1 in Various rack mount kits are available for this analyzer. Contact Sales for more information. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 20 The front panel (Figure 2-1) includes two USB ports for peripheral device connections, which can be used with mouse and keyboard as alternatives to the touchscreen interface, or with flash drive for uploads/downloads (devices not included). Figure 2-1. Front Panel Layout Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 21 2.2.2 R EAR PANEL Figure 2-2 shows the layout of the rear panel. Table 2-2 provides a description. Figure 2-2. Rear Panel Layout 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 22 For voltage or current loop outputs to a strip chart recorder and/or a data logger. ETHERNET Connector for network or Internet remote communication, using Ethernet cable. Serial communications port for RS-232 Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 23 NTERNAL HASSIS CAUTION – UV RADIATION RISK Do not look directly at the light of the UV lamp. Use proper UV- protective lenses. Figure 2-3. N400 Internal Layout – Top View 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 24 AC voltage range and ensure that it is equipped with a functioning earth ground. It is important to adhere to all safety and cautionary messages. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 25 Setup>Analog Outputs menu. Ground Ground Isolated Current Outputs I Out + I Out - I Out + User definable through the Setup>Analog Outputs menu. I Out - I Out + I Out - 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 26 Utilities>Diagnostics>Digital Outputs menu Ground Digital Input1 = Remote Zero Cal Digital Input2 = Remote Span Cal (Digital Input3 not used) View status in Utilities>Diagnostics>Digital Inputs menu Ground Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 27 232Tx View/edit the Communications parameters in the Setup>Comm>COM2 menu. RS-232 Baud rate: 115200 bits per second (baud) • Data Bits: 8 data bits with 1 stop bit • Parity: None • 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 28 Remove dust plugs from rear panel exhaust and supply line fittings before powering on/operating instrument. These plugs should be kept for reuse in the event of future storage or shipping to prevent debris from entering the pneumatics. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 29 (O ), this calibration gas cannot be supplied in precisely calibrated bottles like other gases. If the N400 analyzer is not equipped with the optional internal zero air generator (IZS), an • external O generator capable of supplying accurate O calibration mixtures must be used.
  • Page 30 2.3.2.1 PNEUMATIC CONNECTIONS: BASIC CONFIGURATION Figure 2-7. Gas Line Connections for the N400 Analyzer – Basic Configuration For the Model N400 photometric ozone analyzer in its basic configuration (i.e. without the optional internal zero air source or valves), attach the following pneumatic lines:...
  • Page 31 Section 0. 2.3.2.2 PNEUMATIC CONNECTIONS: ZERO/SPAN (Z/S) OPTION For a Model N400 photometric ozone analyzer with the optional zero/span valves, attach the pneumatic lines as described in this section. Figure 2-8. Gas Line Connections for the N400 Analyzer with Zero/Span Valve Option The instrument’s zero air and span gas flow rate required for this option is 800 cc/min,...
  • Page 32 Span gas can by generated by a TAPI 700-Series Mass Flow Calibrator equipped with a Photometer Option or a TAPI 700-Series UV Photometric Ozone Calibrator. Attach a gas line from the source of zero air (e.g. a Teledyne API 700-Series zero air generator) to the ZERO AIR inlet.
  • Page 33 DRY AIR MODEL 701 VENT Zero Gas Generator Figure 2-9. Gas Line Connections for the N400 Analyzer with IZS Option AMPLE OURCE Attach a sample inlet line to theSAMPLE inlet port. • Sample Gas pressure must equal ambient atmospheric pressure (1.0 psig) •...
  • Page 34 ZERO AIR DRY AIR SAMPLE and DRY AIR inlets open to room Figure 2-10. Gas Line Connections when the N400 Analyzer is Located in the Room Being Monitored AMPLE AS AND OURCES For instruments located in the same room being monitored, there is no need to attach the gas inlet lines to the SAMPLE inlet or the DRY AIR inlet.
  • Page 35 (with IZS installed) BEING ZERO AIR MONITORED DRY AIR Figure 2-11. Gas Line Connections when the N400 Analyzer is Monitoring a Remote Location AMPLE OURCE Attach a sample inlet line leading from the room being monitored to the SAMPLE inlet fitting.
  • Page 36 2.3.3 P NEUMATIC IAGRAMS This Section shows the pneumatic flow diagrams for basic and Internal Zero Span (IZS) configurations. 2.3.3.1 PNEUMATIC FLOW: BASIC CONFIGURATION Figure 2-12. N400 Pneumatic Diagram – Basic Unit Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 37 2.3.3.2 PNEUMATIC FLOW: ZERO/SPAN (ZS) VALVE OPTION Figure 2-13. N400 Pneumatic Diagram with Zero/Span (ZS) Option Table 2-6. Operating States for Zero/Span Valve Option Mode Valve Condition Sample/Cal Open to SAMPLE inlet SAMPLE Zero/Span Open to ZERO AIR inlet Sample/Cal...
  • Page 38 2.3.3.3 PNEUMATIC FLOW: INTERNAL ZERO/SPAN (IZS) VALVE OPTION Figure 2-14. N400 Pneumatic Diagram with Internal Zero/Span (IZS) Option Table 2-7. Operating States for Internal Zero/Span Valve Option Mode Valve Condition Sample/Cal Valve Open to SAMPLE inlet SAMPLE Ozone Generator Sample/Cal Valve...
  • Page 39 (Section 2.3.4.3) and run an initial calibration (Section 4). Section 2.4 introduces the menu system, and Section 2.5 provides setup/customization instructions. CAUTION! If the presence of ozone is detected at any time, power down the instrument and contact Teledyne API Technical Support as soon as possible: +1 800-324-5190 or email: api-techsupport@teledyne.com 2.3.4.1 STARTUP...
  • Page 40 Figure 2-17. Viewing Active Alerts Page If Alerts about warning conditions persist after the warm-up period or after being cleared, investigate their cause using the troubleshooting guidelines in Section 5.7. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 41 Follow the appropriate calibration instructions in Section 4. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 42 Time settings*; and check for firmware updates when Section 2.5.9 connected to a network that is connected to the Internet. Time Zone change requires special procedures (Section 5.5). Comm View and configure network and serial communications. Section 2.5.10 Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 43 Figure 2-19 presents an orientation to the main display screen; Figure 2-20 shows that pressing the gas name or its concentration value or a meter below displays a live plot of their respective readings. Section 2.5.6 provides configuration instructions. Figure 2-19. User Interface Orientation 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 44 Figure 2-20. Concentration and Stability Graph (top) and Meter Graph (bottom) Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 45 Figure 2-21. Figure 2-21. Dashboard Page Several of the common parameters and their descriptions are presented in Table 2-9. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 46 Optical Bench and the Sample Pump. Sample The absolute pressure of the Sample Gas as measured by a IN-HG-A Pressure solid-state pressure sensor. Sample Temp The temperature of the gas inside the Sample Chamber. °C Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 47 To clear Alerts from the Active Alerts page, either check individual boxes to choose specific Alerts, or check the Select All box to choose all Alerts, then press the Clear Selected button. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 48 The Calibration menu is used for multipoint calibrations as well as calibrations for zero and span with valve options, and for external calibration with valve options installed. Calibration procedures are presented in Section 4. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 49 (Section 4.5.1). 2.4.6 S ETUP The Setup menu is for configuring the instrument’s various programmable features and functions. Section 2.5 provides details for the menus under Setup. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 50 Sections 2.5.1.1 and 2.5.1.2 providing additional details. To transfer captured instrument data to a flash drive see Section 2.5.1.3. Figure 2-25. Datalog Configuration, New Log Page Figure 2-26. Datalog Configuration, Existing Log Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 51 Figure 2-27. Creating a New Data Log The parameters available in the list of Log Tags include the names of Events configured in the Events page (Section 2.5.2). 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 52 Figure 2-28. Datalog Periodic Trigger Configuration 2.5.1.2 CONFIGURING TRIGGER TYPES: CONDITIONAL Conditional Trigger tracks/records data for user-selected parameters that meet specified conditions. Figure 2-29. Datalog - Conditional Trigger Configuration Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 53 Some Events are standard and not editable while others are user-configurable, described here. Existing Events are listed in the Events page (Figure 2-31) under the Setup menu. Figure 2-31. Events List 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 54 Non-latching allows the entry in the Active Alerts screen and the internal Event state to continuously update based on the Event criteria, requiring no user interaction to clear the Alert or Event state). Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 55 (Figure 2-33), or press the Delete button to delete the Event. Figure 2-34. Edit or Delete an Event Some default Events that cannot be entirely deleted may Note return after reboot. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 56 ASHBOARD Figure 2-35. Dashboard Display and Configuration 2.5.4 S >A ETUP WITH ALVE PTION Auto Cal, automatic zero/span calibration check is available with installed valve options (see Sections 2.3.2 and 4.3). Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 57 MODBUS or Hessen protocols. (Setup>Vars>Instrument ID) Range Mode Controls range mode, single (SNGL) or dual (DUAL). System Hours Total system runtime hours User Units Change the concentration units of measure. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 58 Setup>Homescreen menu or from Home page using the configuration icon (Figure 2-36). Figure 2-36. Homescreen Configuration An orientation to the Homescreen was presented in Section 2.4.1, including Figure 2-19 and Figure 2-20. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 59 For testing, navigate to the Utilities>Diagnostics>Digital Outputs menu to change the state (ON/OFF) of individual digital outputs. Figure 2-37. Digital Outputs Setup 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 60 Current Output (Figure 2-39) to any of a wide variety of “Signals” present in the instrument and customize their respective configurations. Figure 2-38. Analog Output Configuration for Voltage Output, Example Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 61 Manual Adjust field to make incremental adjustments as needed, noting the range and the minimum/maximum outputs shown in (Table 2-12). For Current output, press the +100 button several times to get the setting close • to 4mA. Press the Accept button when adjustment reached. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 62 Each range is usable from -5% to +5% of the rated span. For manual calibration adjustments, see Section 2.5.8.1 for voltage and Section 2.5.8.2 for current. Figure 2-40. Analog Output Calibration, Voltage or Current Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 63 +100 button to arrive at a realistic starting point for 4mA. CAUTION! Do not exceed 60 V peak voltage between current loop outputs and instrument ground. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 64 When an instrument is connected to a network that is connected to the Internet, follow the instructions on this Remote Update page to check for and activate software/firmware updates. (Also refer to Section 5.3). Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 65 Select either 0 or 1 stop bit (typically set in conjunction with Parity and Data bits). 2.5.10.2 TCP PORT2 This menu is configured with the port number for MODBUS (Section 3.1.1). 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 66 192.168.76.1.) that is the address of the computer used by your LAN and serves Gateway as a router to access the Internet or another network. 2.4.1.2 HESSEN Configure Hessen Settings and Gas List (see Section 3.1.2). Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 67 7. When the Status field indicates that the USB drive has been detected, press the “Upload Configuration to Instrument” Start button. 8. When the Status field indicates that the upload is complete, remove the flash drive. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 68 This page intentionaly left blank. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 69 4. Set other parameters as needed (see descriptions in Table 2-14). 5. Press the Accept button to apply the settings. The Setup>Comm>TCP Port2 is set to 502 for MODBUS by default. See Appendix A for MODBUS Registers. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 70 • TYPE 2 has more flexibility when operating with instruments that can measure more than one type of gas. For more specific information about the difference between the two versions, download the Manual Addendum for Hessen Protocol from the Teledyne API's web site: http://www.teledyne-api.com/manuals/.
  • Page 71 Resources in JSON format. Tag names and command strings are case sensitive. The Resources are defined in Table 3-3. The Teledyne API REST guide is a tutorial in the form of Service Note 22-002, accessible among the manuals on our website as “REST API Tutorial for NumaView™ Instruments.
  • Page 72 For MODBUS communications configuration, see Section 3.1.1. NUMAVIEW™ REMOTE For remote operation and data capture through an Ethernet connection, please refer to the NumaView™ Remote Software User Guide, PN 08492, available on our website. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 73 • Have a dew point of -20°C Devices that condition ambient air by drying and removing any pollutants, such as the Teledyne API’ Model 701 Zero Air Module, are ideal for producing Zero Air. 4.1.3 C ALIBRATION Span Gas is a gas specifically mixed to match the chemical composition of the type of gas being measured at near full scale of the desired measurement range and should be certified traceable to NIST Standard Reference Material (SRM).
  • Page 74 N400 successfully rejects interference from all of these with the exception of mercury vapor. If the Model N400 is installed in an environment where the presence of mercury vapor is suspected, steps should be taken to remove the mercury vapor from the sample gas before it enters the analyzer.
  • Page 75 Sample port, and check the reading after the Stability falls below 1.0 PPB (either in the gas graph or in the Dashboard). Otherwise, follow the steps presented in Sections 4.2.1.1 and 4.2.1.2. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 76 In the Cal Result window, press OK. 3. Press the Stop button and return to Home screen. 4. In the Dashboard, check and record the Slope(s) and the Offset(s). (See Section 4.4 regarding these values). Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 77 Figure 4-2. Zero and Span Calibration Screens Follow the instructions in Section 4.2.1, except instead of the M-P menu, go to the Calibration>Zero menu for Zero cal and to the Calibration>Span menu for O3 Span cal. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 78 Apply button is clicked. However, if a calibration or calibration check is initiated outside of Auto Cal, the user- initiated operation will override the Auto Cal sequence. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 79 Auto Cal check will override the Auto Cal check. It is recommended that calibrations be performed • using external sources of Zero Air and Span Gas whose accuracy is traceable to EPA standards. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 80 Section 5. CALIBRATION OF THE ELECTRONIC SUBSYSTEMS There are several electronic characteristics of the N400 analyzer’s photometer that may occasionally need checking or calibration. These calibrations include Dark Calibration, Pressure Cal and Flow Cal (and O3 Gen Cal when the O Generator option is installed), all located under the Utilities>Diagnostics menu.
  • Page 81 Generator output to a series of levels between zero and full scale and matching each level to a drive voltage from the generator lamp. This calibration is typically performed when the O3 Generator lamp requires adjustment or replacement. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 82 This page intentionaly left blank. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 83 Always power off the instrument before disconnecting or reconnecting internal electrical assemblies. Failure to do so can cause damage to instrument. When cleaning (or any time), avoid spraying anything directly onto any part of the analyzer. 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 84 To perform a CHECK of the instrument’s Zero or Span Calibration, refer Sections 4.2.1.1 4.2.1.2, respectively. Alternatively, use the Auto Cal feature described in Section 4.3 Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 85 Perform Flow Flow Check Every 6 Months 5.6.4 Check Annually or after Perform 5.6.3 Leak Check any Maintenance Leak Check or Repair Pneumatic Examine and Yes if As needed lines clean cleaned Teledyne API – Model N400 O Analyzer 092910400E DCN8928...
  • Page 86 This page intentionally left blank. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 87 • Pneumatic leaks – instrument & sample system • Pneumatics becoming contaminated/dirty Increasing • Dirty particulate filter O3 SLOPE Span Cal • Pneumatic leaks – instrument & sample system • Contaminated calibration gas Decreasing 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 88 Figure 5-1. Report Generation Page The report can also be set to generate periodically and sent to a Web services “cloud” where it is available for viewing by Teledyne API technical support personnel. Set this function with two Vars: Setup>Vars>Upload Report to Cloud: set to True.
  • Page 89 6. When complete, as indicated in the Status field, press the Done button, which replaces the Cancel button, and remove the flash drive. 7. Power off and restart the instrument to complete the new firmware installation. 092910400F DCN Teledyne API – Model N400 O Analyzer...
  • Page 90 6. After the Time Zone is implemented first (Steps 1 through 5), then other changes to the date and/or time can be made, and recycling the power is not necessary. Figure 5-4. Time Zone Change Requirements Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 91 To change the filter element: 1. Turn OFF the analyzer to prevent drawing debris into the instrument. 2. Open the N400’s hinged rear panel and unscrew the knurled retaining ring on the filter assembly. Figure 5-5. Replacing the Particulate Filter’s Membrane Element 3.
  • Page 92 If the reading is < 10 in-Hg, the pump is in good condition and there are no large leaks. 4. Check the sample gas flow. • If the flow is <10 cm /min and stable, there are no large leaks in the instrument’s pneumatics. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 93 8. Once the leak has been located and repaired, the leak-down rate should be < 1 in- Hg (0.4 psi) in 5 minutes after the pressure is shut off. 092910400F DCN Teledyne API – Model N400 O Analyzer...
  • Page 94 Slide the front of the tube past the detector block and out of the • instrument. CAUTION – General Safety Hazard Do not cause the tube to bind against the metal housings: the tube may break and cause serious injury. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 95 Leave the UV lamp setscrew loose for now. • 7. Turn the analyzer back on and allow it to warm up for at least 15 minutes. 8. Navigate to Utilities>Diagnostics>Analog Inputs>Photo Detector. 092910400F DCN Teledyne API – Model N400 O Analyzer...
  • Page 96 Figure 5-6. O Generator UV Lamp 4. Unscrew the UV lamp holder and gently pull out the old lamp. 5. Inspect the o-ring beneath the lamp holder and replace if damaged. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 97 2. Examine the values of all parameter functions and compare them to factory values. Note any major deviations from the factory values and take corrective action. 3. Use the internal electronic status LEDs to determine whether the electronic communication channels are operating properly. 092910400F DCN Teledyne API – Model N400 O Analyzer...
  • Page 98 1 • Failed Pressure Sensor/circuitry WARNING in-Hg per 1000 ft of altitude (with no flow – If Sample Pressure is > 35 in-HG: pump disconnected). • Bad Pressure Sensor/circuitry Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 99 Defective UV lamp power supply. If the Photo Ref value changes by more than 10mV between zero and span gas: • Defective/leaking switching valve. Sample See Table 5-3 for SAMPLE PRES WARN. Pressure 092910400F DCN Teledyne API – Model N400 O Analyzer...
  • Page 100 Use the Utilities>Diagnostics menu to view the raw voltage of an input signal or the Setup menu to control the state of an output voltage or control signal. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 101 The following illustrations show connectors and LEDs that can indicate where issues may lie. Figure 5-7 shows the layout for the mainboard; Figure 5-8 shows the layout for the ozone brick module’s smartboard. Figure 5-7. Mainboard 092910400F DCN Teledyne API – Model N400 O Analyzer...
  • Page 102 Figure 5-8. Ozone Sensor Board LEDs Figure 5-9. DC Pump Control Board LEDs Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 103 Confirm that the sample pump is operating (turning). If not, use a DC voltmeter to make sure that power is being supplied to the pump if no power is present at the electrical leads of the pump. 092910400F DCN Teledyne API – Model N400 O Analyzer...
  • Page 104 If the actual flow measured does not match the displayed flow, but is within the limits of 720-880 cm /min, adjust the calibration of the flow measurement as described in Section 5.6.4. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 105 5.7.6.2 NON-REPEATABLE ZERO AND SPAN As stated earlier, leaks both in the N400 and in the external system are a common source of unstable and non-repeatable readings.
  • Page 106 Individual control loops are used to maintain the set point of the UV Lamp or the IZS Ozone Generator (Optional) temperatures. If any of these temperatures are out of range or are poorly controlled, the N400 will perform poorly. 5.7.8.1 BOX TEMPERATURE View the Box Temp signal using the signal voltage in the Utilities>Diagnostics>Analog...
  • Page 107 Last, check that the cable running from the power supply is properly seated in its connector at J1 on the Mainboard (Figure 5-12), and use a voltmeter to check TP7 on the Mainboard (Figure 5-7). 092910400F DCN Teledyne API – Model N400 O Analyzer...
  • Page 108 5.7.9.3 RS-232 COMMUNICATIONS Teledyne API analyzers use the RS-232 communications protocol to allow the instrument to be connected to a variety of computer-based equipment. Problems with RS-232 connections usually center around such things as incorrect connector configuration or incorrect software settings.
  • Page 109 Never pull out fuse drawer without ensuring that the Hard Power switch is in OFF position and power cord disconnected, to ensure there is no power to the instrument before checking/changing fuse. 092910400F DCN Teledyne API – Model N400 O Analyzer...
  • Page 110 Ensure to carry out a leak check (Section 5.6.3) and a Note recalibration after the analyzer has warmed up for about 60 minutes. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 111 CONNECTORS ON MAINBOARD Modules can be connected to any of the Mainboard’s six CANBUS connectors. Figure 5-12. Mainboard Connectors 5.8.2.2 CONNECTORS ON DC PUMP PCA Figure 5-13. DC Pump Control Board Connectors 092910400F DCN Teledyne API – Model N400 O Analyzer...
  • Page 112 3. The reference scrubber is a blue colored canister located at the rear of the measure/reference valve assembly. 4. Disconnect the top 1/8” brass tube fitting from the scrubber. 5. Carefully remove the scrubber from the retaining clip. Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 113 5. Disconnect 1/8” tube fitting on the other end of the scrubber. 6. Remove the scrubber and install new scrubber 7. Reassemble by reversing these steps. IZS ZERO AIR SCRUBBER Figure 5-16. IZS O Generator Zero Air Scrubber Location 092910400F DCN Teledyne API – Model N400 O Analyzer...
  • Page 114 FREQUENTLY ASKED QUESTIONS The following is a list from the Teledyne API’s Technical Support Department of the most commonly asked questions relating to this analyzer. QUESTION ANSWER This happens when the measured gas concentration differs significantly Why is the ZERO or SPAN button from the span or zero gas concentration value entered by the user.
  • Page 115 Toll-free Phone: +1 800-324-5190 Phone: +1 858-657-9800 Fax: +1 858-657-9816 Email: api-techsupport@teledyne.com Website: http://www.teledyne-api.com/ Before contacting Teledyne API Tech Support, please fill out the problem report form, available online for electronic submission at http://www.teledyne-api.com. 092910400F DCN Teledyne API – Model N400 O Analyzer...
  • Page 116 6. THEORY OF OPERATION The Model N400 ozone analyzer is a microprocessor-controlled analyzer that determines the concentration of Ozone (O ) in a sample gas drawn through the instrument. It requires that sample and calibration gasses be supplied at ambient atmospheric pressure in order to establish a stable gas flow through the absorption tube where the gas’...
  • Page 117 (Euler’s number) is the absorption path, or the distance the light travels as it is being absorbed. is the concentration of the absorbing gas (in the case of the N400, Ozone (O α is the absorption coefficient that tells how well O absorbs light at the specific wavelength of interest.
  • Page 118 HOTOMETER BSORPTION In the most basic terms, the photometer of the Model N400 uses a high energy, mercury vapor lamp to generate a beam of UV light. This beam passes through a window of material specifically chosen to be both non-reactive to O and transparent to UV radiation at 254nm and into an absorption tube filled with Sample Gas.
  • Page 119 O is present and when it is not. The Model N400 accomplishes this by alternately sending the sample gas directly to the absorption tube and passing it through a chemical scrubber that removes any O present;...
  • Page 120 Measurement and Reference Phases rendering the analyzer useless for detecting O If the Model N400 is installed in an environment where the presence of mercury vapor is suspected, specific steps MUST be taken to remove the mercury vapor from the sample gas before it enters the analyzer.
  • Page 121 6.2.2 F ONTROL To maintain a constant flow rate of the sample gas through the instrument, the N400 uses a special flow control assembly located downstream from the absorption tube and in the exhaust gas line just before the pump (see Figure 10-7). This assembly consists of: •...
  • Page 122 ARTICULATE ILTER The N400 Ozone Analyzer comes optionally equipped with either a 47 mm diameter Teflon particulate filter with a 5 micron pore size or a long-life DFU filter with 0.01 micron pore size. The filter is accessible through the hinged rear panel, which folds down to allow access, and should be changed according to the suggested maintenance schedule described in Table 5-1.
  • Page 123 Unlike other analyzers that average the output signal over a fixed time period, the Model N400 averages over a set number of samples, where a new sample is calculated approximately every 3 seconds - this is a technique is known as boxcar averaging.
  • Page 124 The instrument slope and offset values recorded during the last calibration are viewable in the Dashboard (Setup>Dashboard to configure). Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 125 ANALOG_OUPUT_CAL1 SYS_WARN_AO_OUTPUT2_CAL status of ANALOG_OUPUT_CAL2 SYS_WARN_AO_OUTPUT3_CAL status of ANALOG_OUPUT_CAL3 SYS_WARN_AO_OUTPUT4_CAL status of ANALOG_OUPUT_CAL4 SYS_WARN_AO_OUTPUT5_CAL status of ANALOG_OUPUT_CAL5 SYS_WARN_AO_OUTPUT6_CAL status of ANALOG_OUPUT_CAL6 SYS_WARN_AO_OUTPUT7_CAL status of ANALOG_OUPUT_CAL7 WARM_UP_COMPLETE status of WARM_UP_COMPLETE 092910400C DCN8656 Teledyne API – Model N400 O Analyzer...
  • Page 126 Sample temperature in degree C AI_PUMP_FLOW Sample Flow in CC/M AI_PHOTO_PRESSURE_UNITS Sample pressure in in.Hg-A AI_BOX_TEMP Box temperature in degree C SV_SERIAL_NUMBER Serial Number Holding Registers O3_TARGET_ZERO_CONC_1 Target zero1 O3_TARGET_SPAN_CONC_1 Target span1 Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 127 DIAG Diagnostics, the diagnostic settings of the analyzer. Disk On Module, a 44-pin IDE flash drive with up to 128MB storage capacity for instrument’s 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 128 Perfluoroalkoxy, an inert polymer; one of the polymers that Du Pont markets as Teflon ® Programmable Logic Controller, a device that is used to control instruments based on a logic level signal coming from the analyzer Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 129 Universal Serial Bus: a standard connection method to establish communication between peripheral devices and a host controller, such as a mouse and/or keyboard and a personal computer or laptop VARS Variables, the variable settings of the instrument Voltage-to-Frequency Zero / Span 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 130 Sample Pressure, 96 Sample Temperature, 97 Thermistors Sample Temperature, 97 LAMP STABIL WARN, 96 SLOPE, 98 Span Gas, 98, 102, 103, 104, 112 STABIL, 96, 97 SYSTEM RESET, 97 Measure Reference Ratio, 117 Teledyne API – Model N400 O Analyzer 092910400F DCN8928...
  • Page 131 SAMPLE FLOW WARN, 96 Beer-Lambert Equation, 117 SAMPLE TEMP WARN, 97 SYSTEM RESET, 97 Ultraviolet Light, 116, 117, 118 UV Absorption Path, 116, 117 Zero Air, 98, 102, 103, 111, 112 092910400F DCN8928 Teledyne API – Model N400 O Analyzer...
  • Page 132 APPENDIX B - N400 Interconnects REVISION HISTORY CHASSIS GROUND FRONT PANEL ZONE DESCRIPTION DATE APPROVED OPTION INITIAL RELEASE, PROTOTYPE 8/9/2019 HEATER 019320100, CBL, GRND STRAP 088200100 084260000 PCA, IZS PCA, MAINBOARD, 089090000 MODULE FOR SOM304 ASSY, FAN, 24VDC 087960100, CBL, 24" CANBUS 087960100, CBL, 24"...