Teledyne 4020 Operating & Maintenance Manual
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Teledyne 4020 Operating & Maintenance Manual

Total hydrocarbon analyzer
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Total Hydrocarbon Analyzer
INSTRUCTION, OPERATING, AND
MAINTENANCE MANUAL FOR
MODEL 4020
Special Version with Modifications for
Automatic Background Gas Switching
Toxic and/or flammable gases or liquids may be present in this monitoring system.
Personal protective equipment may be required when servicing this instrument.
Hazardous voltages exist on certain components internally which may persist for
a time even after the power is turned off and disconnected.
Only authorized personnel should conduct maintenance and/or servicing. Before
conducting any maintenance or servicing, consult with authorized
supervisor/manager.
Teledyne Analytical Instruments
DANGER
P/N M81965
4/05/2010 Rev 6
i

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  • Page 1 Total Hydrocarbon Analyzer INSTRUCTION, OPERATING, AND MAINTENANCE MANUAL FOR MODEL 4020 Special Version with Modifications for Automatic Background Gas Switching P/N M81965 4/05/2010 Rev 6 DANGER Toxic and/or flammable gases or liquids may be present in this monitoring system. Personal protective equipment may be required when servicing this instrument.
  • Page 2 Any safeguards required such as locks, labels, or redundancy, must be provided by the user or specifically requested of Teledyne at the time the order is placed.
  • Page 3 40 psig to the fuel input. This is discussed in the manual in the Installation section.  Using Hydrogen as Fuel: For applications where the fuel is hydrogen, the gas connections made at the back panel are Teledyne Analytical Instruments...
  • Page 4 At the “FUEL” inlet, replace the “40% /60% N ” with pure H . This is discussed in the Installation section.  Special Analysis Ranges: this model 4020 has special analysis ranges: Range 1: ___________ Range 2: ___________...

  • Page 5: Safety Messages

    NOTE: Additional information and comments regarding a specific component or procedure are highlighted in the Symbol form of a note. STAND-BY: This symbol indicates that the instrument is on Stand-by but circuits are active. Teledyne Analytical Instruments...
  • Page 6 Manuals do get misplaced. Additional manuals can be obtained from Teledyne at the address given in the Appendix. Some of our manuals are available in electronic form via the internet. Please visit our website at: www.teledyne-ai.com.

  • Page 7: Table Of Contents

    2.2.3 Fuel and Blanket Air Systems 2.2.4 Flame Ionization Detection Cell 2.3 Detection Cell 2.3.1 Electrometer-Amplifier 2.3.2 Anode Power Supply 2.3.3 Flame Guard Circuit 2.3.4 Flame Ignition Circuit 2.3.5 Proportional Temperature Control Circuit Installation ................... 13 3.1 Unpacking the Analyzer Teledyne Analytical Instruments...
  • Page 8 Model 4020 3.2 Mounting the Analyzer 3.3 User Connections 3.3.1 Electrical Power Connections 3.3.2 Gas Connections 3.3.2.1 Vent Connections 3.3.3 Electrical Connections 3.3.3.1 Primary Input Power 3.3.3.2 Fuse Installation 3.3.3.3 50-Pin Equipment Interface Connector 3.3.3.4 Analog Output 3.3.3.5 Alarm Relays 3.3.3.6 Background Gas Selection and Digital Remote...
  • Page 9 4.6.10 The Model Screen 4.6.11 Zero and Span Functions 4.6.12 The Alarms Function 4.6.13 The Range Function 4.6.13.1 Manual (Select/Define Range) Screen 4.6.13.2 Auto Range 4.6.14 Digital Filter Setup 4.6.15 Fuel Display 4.6.16 Valve Selections 4.6.16.1 Disabled Teledyne Analytical Instruments...
  • Page 10 Model 4020 4.6.16.2 User Select 4.6.16.3 Default (By Function) 4.6.16.4 Observing the gas Stream Concentrations 4.6.17 Standby 4.7 Advanced User Functions 4.7.1 Zero Offset Adjustment 4.7.2 Background Gas Selection 4.7.2.1 Manually Selecting a Background Gas 4.7.2.2 Automatic Background Gas Selection 4.7.2.3 Match/Invert...
  • Page 11 Total Hydrocarbon Analyzer Teledyne Analytical Instruments...

  • Page 12: List Of Figures

    Model 4020 List of Figures Figure 1-1: Gas Sample System with Optional AutoCal Valves ..4 Figure 1-2: Gas Sample System Without Optional AutoCal Valves . 5 Figure 1-3: Flame Ionization Cell ............. 6 Figure 2-1: View Inside Cabinet ............ 11 Figure 3-1: Gas Connections ............
  • Page 13 Table 3-7: Pin out of 50 pin D-Sub Connector ....... 23 Table 3-8: Commands via RS-232 Input ........25 Table 3-9: Required RS-232 Options ..........26 Table 4-2: AL-2 Relay Status for MATCH and INVERT ....66 Teledyne Analytical Instruments xiii...

  • Page 14: Additional Safety Information

    Since the use of this instrument is beyond the control of Teledyne, no responsibility by Teledyne, its affiliates, and agents for damage or injury from misuse or neglect of this equipment is implied or assumed.
  • Page 15 4020: 1. Line voltages and line related voltages such as 115 VAC which exists within the 230 VAC version as well. These voltages stop when the 4020 is turned off and the mains (line) cord is removed from the instrument.

  • Page 16: Procedure For Removal Of Internal Inaccessible Shock Hazards

    4020, PERFORM EACH OF THE FOLLOWING STEPS, IN THE ORDER GIVEN, BEFORE SERVICING BEGINS: 1. Switch off the power to the 4020 and remove the mains (line) power cord from the 4020. 2. Remove all external voltages from the connections to the alarm contacts.
  • Page 17 PRINCIPLES OF OPERATION OF THIS EQUIPMENT ARE UNDERSTOOD BY THE USER. SINCE THE USE OF THIS INSTRUMENT IS BEYOND THE CONTROL OF TELEDYNE, NO RESPONSIBILITY BY TELEDYNE, ITS AFFILIATES AND AGENTS FOR DAMAGE OR INJURY RESULTING FROM MISUSE OR NEGLECT OF THIS INSTRUMENT IS IMPLIED OR ASSUMED.

  • Page 19: Introduction

    Analyzer is a versatile instrument designed to measure the quantity of hydrocarbons present in a positive pressure sample as equivalent methane. The Model 4020 is a microprocessor controlled digital instrument based on Teledyne’s highly successful Model 402R series analog Total Hydrocarbon Analyzer. This instrument includes special modifications for automatic switching between sample gas in two different background gases.

  • Page 20: Principle Of Operation

    These special considerations, if applicable, will be described in detail on specific application pages as Addenda to this manual. When the Model 4020 is a part of a larger system, it is subordinate to that system, and specific installation and operation conditions of that system will apply.

  • Page 21: Applications

    An RS-232 port is also available at the rear panel for connection to a remote computer or other digital communication device. The Model 4020 is set up for either 120 VAC 60 Hz or 230 50/60 Hz operation depending on the customer’s requirements.

  • Page 22: Figure 1-1: Gas Sample System With Optional Autocal Valves

    Introduction Model 4020 Figure 1-1: Gas Sample System with Optional AutoCal Valves Teledyne Analytical Instruments...

  • Page 23: Figure 1-2: Gas Sample System Without Optional Autocal Valves

    Total Hydrocarbon Analyzer Introduction Figure 1-2: Gas Sample System Without Optional AutoCal Valves Teledyne Analytical Instruments...

  • Page 24: Figure 1-3: Flame Ionization Cell

    Introduction Model 4020 Figure 1-3: Flame Ionization Cell Teledyne Analytical Instruments...

  • Page 25: Operational Theory

    When installed, it is part of the isothermal chamber. The bypass flow is also controlled from this optional panel. The software in the Model 4020 allows the system to be used for analyzing a sample gas in two different backgrounds, O...

  • Page 26: Input Porting

    Note: The user must supply the necessary valves and any associated switching equipment for delivering the correct sample/background gas combination to the analyzer. This special 4020 Analyzer includes the ability to automatically select between two background gases (N and O ).

  • Page 27: Fuel And Blanket Air Systems

    THE POWER CORD. The collector is interconnected with the electrometer-amplifier PC board by a coaxial cable. Although the cable and fittings are intended for coaxial service, the cable is actually being used as a shielded single- conductor connection. Teledyne Analytical Instruments...
  • Page 28 Operational Theory Model 4020 The anode-igniter, as its name implies, serves two functions. When relay K2 at PCB part number B74671 is energized, the coil becomes an electrical heating element that glows red-hot and ignites the hydrogen fuel. When relay K2 at B74671 is de-energized, the coil is connected to the +260 volt DC terminal of the anode-flame guard power supply PC board.

  • Page 29: Electrometer-Amplifier

    High voltage regulation is achieved through the use of series-connected zener diodes. The simplicity of this circuit’s design can be attributed to the extremely low current demand of the anode circuit. The positive output voltage is Teledyne Analytical Instruments...

  • Page 30: Flame Guard Circuit

    Operational Theory Model 4020 nominally 125 volts. Output tolerance is ±10 volts from the specified 125 volts. 2.3.3 Flame Guard Circuit A thermistor-controlled, transistorized switching circuit is employed to operate a relay in the event of a flame-out condition. A panel indicator light and fuel shut-off solenoid valve are operated by the relay to alarm personnel that a flame-out condition has occurred.

  • Page 31: Installation

    3.2 Mounting the Analyzer The Model 4020 is a general-purpose analyzer and as such is designed with (non-sealed) enclosures. It must be installed in an area where the ambient temperature is not permitted to drop below 32ºF nor rise above 100ºF.

  • Page 32: User Connections

    Installation Model 4020 Note: To completely slide the analyzer out of the enclosure, pull analyzer out until it stops, then push down on the release levers found almost at the end of the sliders, both sides at the same time.

  • Page 33: Figure 3-1: Gas Connections

    Note: If different background gases are being used, the user must supply the necessary valves and any associated Teledyne Analytical Instruments...

  • Page 34: Vent Connections

    Installation Model 4020 switching equipment for delivering the correct sample/background gas combination to the analyzer. 3.3.2.1 V ONNECTIONS Two separate vent connections may be required on your instrument:  Sensor Vent  Bypass Vent Sensor vent and sample bypass vent must run separately.

  • Page 35: Electrical Connections

    Total Hydrocarbon Analyzer Installation 3.3.3 Electrical Connections Figure 3-1 shows the Model 4020 rear panel. There are connections for power, digital communications, and both digital and analog concentration output. For safe connections, no uninsulated wiring should be able to come in contact with fingers, tools or clothing during normal operation.

  • Page 36: Analog Output

    Installation Model 4020 Figure 3-2: Equipment Interface Connector Pin Arrangement 3.3.3.4 A NALOG UTPUT There are four DC output signal pins—two pins per output. For polarity, see Table 3-1. The outputs are: 0–1 VDC % of Range: Voltage rises linearly with increasing concentration, from 0 V at 0 concentration to 1 V at full scale.

  • Page 37: Table 3-2: Analog Concentration Output-Example

    Table 3-3 gives the range ID output for each analysis range. Table 3-2: Analog Concentration Output—Example Voltage Signal Current Signal Output (VDC) Output (mA DC) 10.4 12.0 13.6 15.2 16.8 18.4 20.0 Teledyne Analytical Instruments...

  • Page 38: Alarm Relays

    Installation Model 4020 Table 3-3: Analog Range ID Output—Example Range Voltage Signal Current Signal Application Output (VDC) Output (mA DC) Range 1 0.20 0–1 ppm CH Range 2 0.50 0–10 ppm CH Range 3 0.80 16.8 0–100 ppm CH 3.3.3.5 A...

  • Page 39: Background Gas Selection And Digital Remote Cal Inputs

    Gas Selected selected selected The background gas selection inputs (formerly digital remote zero input) accepts 0 V (off) or 24 VDC (on) for automatic control of the background gas switching. The customer will provide a signal that is Teledyne Analytical Instruments...

  • Page 40: Table 3-5: Remote Calibration Connections

    This signal should be 24VDC to the Remote Zero Contacts as shown in Table 3-5. This informs the 4020 Analyzer that it should use the calibration parameters for a particular background gas. The analyzer will open or...

  • Page 41: Range Id Relays

    Table 3-7: Pin out of 50 pin D-Sub Connector pin # Description + Range ID 4-20 ma - Range ID 4-20 ma + Output 4-20 ma - Output 4-20 ma - Output 0-1 v + Range ID 0-1 v Teledyne Analytical Instruments...
  • Page 42 Installation Model 4020 pin # Description Background Gas Select + Remote Span + Background Gas Select - Remote Span - Network + Remote Thermistor Zero Solenoid Return Span Solenoid Return Span Solenoid Hot Range 3 Contact Range 3 Contact Alarm 3 C Contact...

  • Page 43: Port

    Table 3-8: Commands via RS-232 Input Command Description as<enter> Immediately starts an autospan. az<enter> Immediately starts an autozero. Implementation: The RS-232 protocol allows some flexibility in its implementation. Table 3-8 lists certain RS-232 values that are required by the Model 4020 implementation. Teledyne Analytical Instruments...

  • Page 44: Supporting Gases

    Installation Model 4020 Table 3-9: Required RS-232 Options Parameter Setting Baud 2400 Byte 8 bits Parity none Stop Bits Message Interval 2 seconds 3.3.5 Supporting Gases Normally, four supporting gases of different composition (see Section 4.1: Equipment) will be required to operate the analyzer. The recommended composition of these gases is specified in the Application Data section of the Appendix.

  • Page 45: Sample Gas

    Note: For applications where the sample gas is hydrogen, the sample gas doubles as the fuel for combustion and is diluted with nitrogen. Connect a nitrogen source (40 psig) to the fuel inlet port. See Figure 3-1. Teledyne Analytical Instruments...
  • Page 46 Installation Model 4020 Note: A gas mixture of 40% H2 and 60% He can be used as fuel as well Teledyne Analytical Instruments...

  • Page 47: Operation

    Operation This section of the manual describes how to setup and operate the Model 4020 Analyzer. Sections 4.1 through 4.5 describe preliminary steps and equipment needed to operate the analyzer. Beginning with Section 4.7, the actual operation of the analyzer is described along with descriptions of the display prompts, messages and options available to the user within a menu or sub menu.

  • Page 48: Preliminary Power-Off Check List

    Operation Model 4020 4. Span Gas: A cylinder containing a composition consisting of the parent gas and a specified (see Appendix: Specifications) amount of methane will be required to standardize the sensitivity setting of the analyzer. The cylinder is to be equipped with an oil-free, dual stage metallic diaphragm regulator.

  • Page 49: Activating The Support Gases

    0.5 to 1.0 SCFH. 4.4.4 Fuel 1. Open the main valve on the tank and set the fuel tank pressure regulator to 30 psig (or to match sample pressure). Teledyne Analytical Instruments...

  • Page 50: Flame Ignition

    See Figure 4-1. The Model 4020 will automatically attempt a flame ignition sequence following the warm-up period which has been preset at the factory. If the ignition process fails, the instrument will attempt to ignite the flame a second time.

  • Page 51: Ignition And/Or Flame Guard Circuit Failure

    Chapter 5: Maintenance & Troubleshooting. 4.6 Analyzer Operation Although the Model 4020 has been programmed for your application at the factory, it can be further configured at the operator level, or even (cautiously) reprogrammed. Depending on the specifics of the application, this might include all or a set of the following procedures: ...

  • Page 52: Default Parameters

    Operation Model 4020  Special functions setup  Calibrate analog output Procedures for accessing and/or changing parameters as well as analyzer operation are detailed in the sections to follow. In general, the sequence of menus available on screen follow a logical course for setup and operation.

  • Page 53: Style Conventions

    In these instructions, to <Enter> means to press the ENTER KEY, and to <Escape> means to press the ESCAPE KEY. To scroll <▲> (or scroll <▼>) means to press UP or DOWN keys as many times as necessary to reach the required menu item. Teledyne Analytical Instruments...

  • Page 54: Mode/Function Selection

    Operation Model 4020 4.6.4 Mode/Function Selection When the analyzer is first powered up, a warm-up for a period ranging from 1 to 16 hours will occur depending on the exact factory configuration. Note: The warm-up period may be bypassed by pressing <Enter>...

  • Page 55: Setup Mode

    The MAIN MENU consists of functions you can use to customize and check the operation of the analyzer. Figure 4-3 shows the functions available in the Model 4020. They are listed here with brief descriptions:  Used to define and/or start an automatic AUTO-CAL: calibration sequence.

  • Page 56: Data Entry

    Operation Model 4020  LINEARIZATION: A restricted function not generally accessed by the end user. It is used to linearize the output for the range of interest.  BACKGROUND GAS: Allows the user to choose between nitrogen or oxygen as the background gas.

  • Page 57: Figure 4-3: Setup Mode Functions

    Total Hydrocarbon Analyzer Operation Figure 4-3: Setup Mode Functions Teledyne Analytical Instruments...

  • Page 58: Escape

    Note: If you require highly accurate AUTOCAL timing, use external AUTOCAL control where possible. The internal clock in the Model 4020 is accurate to 2-3 %. Accordingly, internally scheduled calibrations can vary 2-3 % per day. Note: By default, AUTOCAL is off.
  • Page 59 To have a zero (or span) event occur in an hourly time frame is similar to the above procedures except that you must scroll from the MAIN MENU using the <▼> key until the appropriate line is reached. Figure 4-4 shows the set of screens used in the AUTOCAL function. Teledyne Analytical Instruments...

  • Page 60: Password Protection

    Operation Model 4020 Figure 4-4: AUTOCAL Screens 4.6.7 Password Protection Before a unique password is assigned, the system assigns TAI by default. This password will be displayed automatically. The operator just presses <Enter> to be allowed total access to the instrument's features.

  • Page 61: Entering The Password

    The screen prompts you to enter the current password. If you are not using password protection, press <Enter> to accept TAI as the default password. —or— <Enter> If a password has been previously installed, enter the password press <Enter> to scroll through the letters. Teledyne Analytical Instruments...

  • Page 62: Installing Or Changing The Password

    Operation Model 4020 Use the ▲▼ keys to change the letters to the proper <▲▼> password. <Enter> The last <Enter> enters the password. In a few seconds, you will be given the opportunity to change this password or keep it and go on.

  • Page 63: Logging Out

    4.6.9 System Self-Diagnostic Test The Model 4020 has a built-in self-diagnostic testing routine. Preprogramming signals are sent through the power supply, output board, preamp board and sensor circuit. The return signal is analyzed, and at the end of the test the status of each function is displayed on the screen, either as GOOD or BAD.

  • Page 64: The Model Screen

    Operation Model 4020 Pre-M Test – GOOD (status of the medium gain of the amplifier) Pre-H Test – GOOD (status of the high gain of the amplifier) Note: The self diagnostics are run automatically by the analyzer whenever the instrument is turned on, but the test can also be run by the operator at will.

  • Page 65: Zero And Span Functions

    If you select manual zero (span), the next screen will allow you to enter the concentration in ppm hydrocarbon (methane equivalent) of your zero(span) gas. Note: Make sure that the proper calibration gas is flowing into the analyzer before initiating this function. Depending on your Teledyne Analytical Instruments...
  • Page 66 <Enter> Press <Enter> to start the calibration. The 4020 will begin to analyze the concentration of the zero (span) calibration gas and LED display above the VFD will change to reflect the calibration gas concentration as the analysis proceeds. Internally, the microprocessor calculates the difference between successive samplings and displays the concentration as it changes.
  • Page 67 <Enter> Press <Enter> to accept this value. <▼> Press the DOWN key once to move the arrow down one line to the text Zero (Span) Begin. <Enter> Press <Enter> to start the calibration. Teledyne Analytical Instruments...

  • Page 68: The Alarms Function

    Analyze mode. 4.6.12 The Alarms Function The Model 4020 is equipped with one fully adjustable concentration alarm and a non-adjustable system failure alarm. Each alarm relay has a set of form "C" contacts rated for 3 amperes resistive load at 250 VAC.
  • Page 69 1. Press <Enter> to move to the Active/Defeat field. <Enter> Use the UP/DOWN keys to toggle between Active and <▲▼> Defeat. <Enter> Press <Enter> to accept the entry and move the arrow to the next function (High/Low). Teledyne Analytical Instruments...
  • Page 70 Operation Model 4020 CAUTION: IT IS NOT GOOD PRACTICE TO SILENCE AN EXISTING ALARM BY SETTING THE ALARM ATTRIBUTE TO ‘DEFEAT”. THE ALARM WILL NOT AUTOMATICALLY RETURN TO “ACTIVE” STATUS. IT MUST BE RESET BY THE OPERATOR. IF IT IS...

  • Page 71: The Range Function

    It then allows you to redefine the upper and lower limits, for the range. To enter a MANUAL or fixed range: <▲▼> Scroll to the Range function using the UP/DOWN keys. <Enter> Press <Enter> to activate the RANGE function. Teledyne Analytical Instruments...
  • Page 72 Operation Model 4020 Press <Enter> again to move to the Auto/MAN field. <Enter> <▲▼> Use the <▲▼> keys to toggle between Auto and Manual. Press <Enter> when Man is displayed on screen. <Enter> The next screen prompts you to select a range: R1, R2 or <Enter>...

  • Page 73: Auto Range

    Press <Enter> again to move to the Auto/MAN field. <Enter> <▲▼> Use the <▲▼> keys to toggle between Auto and Manual. Press <Enter> when Auto is displayed on screen. <Enter> This sets the instrument in the Autoranging mode. Teledyne Analytical Instruments...

  • Page 74: Digital Filter Setup

    4.6.14 Digital Filter Setup The Model 4020 analyzer has the option of decreasing or increasing the amount of filtering on the detector signal. This feature enhances the basic filtering done by the analog circuits by setting the amount of digital filtering applied by the microprocessor.

  • Page 75: Fuel Display

    40%H2/60%N2, or 100% H2, or 100%N2. It is an information only screen and has no bearing on the analyzer performance. 4.6.16 Valve Selections This 4020 analyzer has the option of 3 input streams. The rear panel of the analyzer has 3 gas inputs labeled: “SAMPLE", "SPAN" and "ZERO".

  • Page 76: Disabled

    Operation Model 4020 <Escape> Use Escape to move back to the Analyze Mode. Note that the analyzer will now switch gas to the analyzer depending on the choice shown on screen as detailed below. 4.6.16.1 D ISABLED When the valve selection mode “Disabled” is selected, the gas connected to the sample port will be fed to the analyzer, i.e.

  • Page 77: Default (By Function)

    If it is in Analysis mode, the “SAMPLE” valve is open to the analyzer. If it is in a calibration mode then either the “SPAN” or ZERO” valve will be open to the analyzer. Teledyne Analytical Instruments...
  • Page 78 Operation Model 4020 To switch to the default mode of valve operation: <▲▼> From the VALVE SELECTIONS menu, Use the <▲▼> keys to toggle the option to default <Enter> Press <Enter> to bring up the valve selection default screen. ▲▼>...

  • Page 79: Observing The Gas Stream Concentrations

    Note: The actual displayed concentration may be different depending on your calibration gas. Then begin the span or zero routine and observe the concentration on the screen. Since the analyzer is in a calibration mode, the alarms will be suppressed. Teledyne Analytical Instruments...

  • Page 80: Standby

    Pressing <Enter> places the instrument in STANDBY. To exit STANDBY, scroll again to the STANDBY function and press <Enter> again. 4.7 Advanced User Functions The Model 4020 provides additional functions for tailoring the instrument to your specific application. These functions include:  Analog Adjust  Linearization 4.7.1 Zero Offset Adjustment...

  • Page 81: Background Gas Selection

    4.7.2 Background Gas Selection The 4020 Analyzer can be used to analyze sample gas in a background of either O or N .

  • Page 82: Manually Selecting A Background Gas

    Note: It is the user’s responsibility to ensure proper valves are installed for automatically switching the proper sample/background gas to the analyzer synchronized to the signals to and from the 4020 Analyzer. See Section 3.3.3.6.  Match/Invert: This function reverses the logic of the AL-2 relay contact (formerly alarm 2) and is used as an indication of the current selected background gas.

  • Page 83: Automatic Background Gas Selection

    Auto. Use the <Enter> key to place the instrument in Auto <Enter> mode where the 4020 will automatically use the background sample/gas as determined from the remote zero contacts. Note that the AL-2 contacts will switch accordingly. See Section 4.7.2.3 Match/Invert.

  • Page 84: Table 4-2: Al-2 Relay Status For Match And Invert

    Operation Model 4020 Table 4-2: AL-2 Relay Status for MATCH and INVERT Relay Relay Energized De-energized MATCH INVERT To change the logic of the AL-2 relay: <▲▼> From the MAIN MENU, scroll to the BACKGROUND GAS function using the UP/DOWN keys.

  • Page 85: Maintenance & Troubleshooting

    CAUTION: MANY OF THE ELECTRICAL PARTS WITHIN THE MODEL 4020 ARE SUSCEPTIBLE TO DAMAGE FROM ELECTROSTATIC DISCHARGE (ESD). USE ESD SAFE PROCEDURES WHEN HANDLING OR WORKING WITH ELECTRONIC COMPONENTS If the analyzer is suspected of incorrect operation, always evaluate performance with zero or span gas flowing in the sample path.

  • Page 86: Measuring Circuit Electrical Checks

    Maintenance Model 4020 attempt to evaluate performance on sample gas. If analyzer sensitivity is questionable, use the span gas. For all other evaluations, use the zero gas and low range for maximum sensitivity. The important consideration is to control as many variables as possible. Using cylinder-supplied gases of known hydrocarbon content eliminates the possibility of introducing an unknown variable.

  • Page 87: Anode Voltage Check

    PC board. If it is, check the wiring in the anode-igniter cable plug. If necessary, the circuit board can be replaced by first turning off the power, then removing 4 screws holding the board. Teledyne Analytical Instruments...

  • Page 88: Electronic Stability

    Maintenance Model 4020 WARNING: DO NOT TOUCH CAPACITOR C1 OR C2 OR THEIR RELATED CIRCUIT FOILS. A SHOCK HAZARD MAY EXIST. Carefully remove the circuit board without touching any connections which might lead to C1 or C2. After removal, discharge the two capacitors by placing a jumper wire across each.

  • Page 89: Temperature Control Electronic Check

    To check the circuit, employ the following procedure: Consult the 4020 schematic and assembly drawings, as well as the temperature control PC board schematic and assembly drawings at the rear of the manual for circuit details and component placement.

  • Page 90: Ignition And/Or Flame Guard Circuit Checks

    Maintenance Model 4020 terminal 4 on the temperature control board P/N B30927, heater wires are black, and check the resistance between that wire and the remaining undisturbed terminal. If a reading of approximately 100 Ohms, then the heating element is most likely OK.

  • Page 91: Sampling System

    The individual circuits which are required to process the incoming signal and condition it to provide the various outputs, alarms, indicators, etc., 5.5.1 Flame Guard and Anode Power Supply PCB Schematic No. B-74672 Assembly Dwg. No.B-74671 Teledyne Analytical Instruments...

  • Page 92: Proportional Temperature Controller Pcb

    Maintenance Model 4020 Anode Power Supply: The high voltage anode power supply components are mounted on the flame guard and anode power supply printed circuit board. High voltage regulation is achieved through the use of zener diodes. The simplicity of this circuit’s design can be attributed to the extremely low current demand of the anode circuit.
  • Page 93 R2 & R3, R4, C3, R5, and the thermistor resistance at the control temperature. Consequently, the balance point of the bridge formed by this combination of components can be altered by the Teledyne Analytical Instruments...

  • Page 94: Electrometer-Amplifier Pcb

    Maintenance Model 4020 selection of R3, causing the circuit to seek a temperature at which the thermistor resistance balances the bridge. Because IC A1 triggers the thyristor at zero-voltage points in the supply voltage cycle, transient load current surges and radio frequency interference (RFI) are substantially reduced.
  • Page 95 The stability of the electrometer circuit can be tested as follows: 1. Disconnect the collector cable. 2. Place the analyzer in the auto range. 3. Adjust zero offset value so that the recorder reads at some point upscale, and record a 24 hour chart. Teledyne Analytical Instruments...
  • Page 96 Maintenance Model 4020 Teledyne Analytical Instruments...
  • Page 97 Power requirement: 115 VAC, 60 Hz, single phase Power consumption: 140 W maximum Pressure rating: Up to 100 psi Dimensions: 8.75 " x 19 " x 15.5 " (H x W x D) 222 mm x 483 mm x 394 mm Weight: 55 lbs. Teledyne Analytical Instruments...

  • Page 98: Application Data

    Appendix Model 4020 Application Data Model Number: Serial Number: Ranges Of Analysis: Output Signal: Start-Up Span Setting: Control Panel Pressure Settings: Comments: Blanket Air: Fuel: Sample: Bypass Flowrate: A minimum of 0.25 SCFH is indicated on the integral flowmeter Recommended Support Gases: The accessory gases should all be laboratory analyzed and certified as to their hydrocarbon content.

  • Page 99: Recommended Spare Parts List

    Send orders to: TELEDYNE INSTRUMENTS Analytical Instruments 16830 Chestnut Street City of Industry, CA 91749-1580 Telephone: (626) 934-1500 Fax: (626) 961-2538 Web: www.teledyne-ai.com or your local representative. Email: ask_tai@teledyne.com Teledyne Analytical Instruments...

  • Page 100: Drawing List

    Appendix Model 4020 Drawing List D75508 Outline diagram B75509 Piping diagram B79159 Schematic, Electrometer PC board B-74672 Schematic, Flame guard, anode power supply PC board B-31077 Schematic, Temp. controller PC board D65506 Schematic, Backpanel/Power supply PC board D79161 Wiring diagram, 19" rack standard...

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