Trace Oxygen Analyzer OPERATING INSTRUCTIONS FOR Model 3020T Trace Oxygen Analyzer DANGER HIGHLY TOXIC AND OR FLAMMABLE LIQUIDS OR GASES MAY BE PRESENT IN THIS MONITORING SYSTEM. PERSONAL PROTECTIVE EQUIPMENT MAY BE REQUIRED WHEN SERVICING THIS SYSTEM. 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.
Model 3020T Copyright © 1999 Teledyne Analytical Instruments All Rights Reserved. No part of this manual may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any other language or computer language in whole or in part, in any form or by any means, whether it be electronic, mechanical, magnetic, optical, manual, or otherwise, without the prior written consent of Teledyne Analytical Instruments, 16830 Chestnut Street, City of Industry, CA 91749-1580.
Trace Oxygen Analyzer Specific Model Information The instrument for which this manual was supplied may incorporate one or more options not supplied in the standard instrument. Commonly available options are listed below, with check boxes. Any that are incorporated in the instrument for which this manual was supplied are indicated by a check mark in the box.
Model 3020T Table of Contents 1 Introduction 1.1 Overview ........................................................................ 1-1 1.2 Typical Applications ....................................................... 1-1 1.3 Main Features of the Analyzer ....................................... 1-1 1.4 Model Designations ....................................................... 1-2 1.5 Operator Interface .......................................................... 1-3 1.5.1 UP/DOWN Switch .......................
Trace Oxygen Analyzer 3.5 Gas Connections .......................................................... 3-12 3.6 Testing the System ........................................................ 3-14 4 Operation 4.1 Introduction .................................................................... 4-1 4.2 Using the Controls ......................................................... 4-1 4.2.1 Mode/Function Selection ....................................... 4-2 4.2.1.1 Analysis Mode .....................................
Model 3020T 5.3.4 Installing a New Micro-Fuel Cell .............................. 5-6 5.2.5 Cell Warranty ........................................................... 5-6 5.4 Fuse Replacement......................................................... 5-7 5.5 System Self Diagnostic Test ........................................... 5-7 Appendix A-1 A-2 A-3 A-4 A-5 vi Specifications ................................................................ A-1 Recommended 2-Year Spare Parts List ........................
Trace Oxygen Analyzer Introduction 1 Introduction 1.1 Overview The Teledyne Analytical Instruments Model 3020T Trace Oxygen Analyzer is a versatile microprocessor-based instrument for detecting oxygen at the parts-per-million (ppm) level in a variety of gases. This manual covers the Model 3020T, trace oxygen, explosion-proof, bulkhead-mount units only. 1.
1 Introduction Model 3020T • Advanced Micro-Fuel Cell, redesigned for trace analysis, has an expected life of one year. • Versatile analysis over a wide range of applications. • Microprocessor based electronics: 8-bit CMOS microprocessor with 32 kB RAM and 128 kB ROM. • Three user definable output ranges (from 0-10 ppm through 0250,000 ppm) allow best match to users process and equipment. • Air-calibration range for convenient spanning at 20.9 %.
Trace Oxygen Analyzer 1.5 Introduction 1 Operator Interface All controls and displays on the standard 3020T are accessible from outside the housing. The instrument has two simple operator controls. A digital meter, an alphanumeric display, and a sample flowmeter give the operator constant feedback from the instrument. See Figure 1-1. The controls are described briefly here and in greater detail in chapter 4.
1 Introduction Model 3020T 1.5.1 UP/DOWN Switch Functions: The UP/DOWN switch is used to select the function to be performed. Choose UP or DOWN to scroll through the following list of eleven functions: • Auto-Cal Set up an automatic calibration sequence. • PWD Install a password to protect your analyzer setup. • Logout Locks Setup Mode. • Version Displays model and version of analyzer. • Self-Test Runs internal diagnostic program, displays results. • Span Span calibrate the analyzer.
Trace Oxygen Analyzer Introduction 1 1.5.3 Displays Digital Meter Display: The meter display is a LED device that produces large, bright, 7-segment numbers that are legible in any lighting. It produces a continuous readout from 0-10,000 ppm and then switches to a continuous percent readout from 1-25%. It is accurate across all analysis ranges without the discontinuity inherent in analog range switching. Alphanumeric Interface Screen: The VFD screen is an easy-to-use interface from operator to analyzer.
1 Introduction Model 3020T • Alarm Connections 2 concentration alarms and 1 system alarm. • RS-232 Port Serial digital concentration signal output and control input. • Remote Valves Used for controlling external solenoid valves, if desired.
Trace Oxygen Analyzer Introduction 1 • Remote Sensor Used for external sensor and thermocouple, if desired. • Remote Span/Zero Digital inputs allow external control of analyzer calibration. • Calibration Contact To notify external equipment that instrument is being calibrated and readings are not monitoring sample. • Range ID Contacts Four separate, dedicated, range relay contacts. Low, Medium, High, Cal. • Network I/O Serial digital communications for local network access.
1 Introduction Model 3020T Optional: • Calibration Gas Ports Separate fittings for zero, span and sample gas input, plus internal valves for automatically switching the gases in sync with the 3020 electronics. Note: If you require highly accurate Auto-Cal timing, use external Auto-Cal control where possible. The internal clock in the Model 3020T is accurate to 2-3 %. Accordingly, internally scheduled calibrations can vary 2-3 % per day.
Trace Oxygen Analyzer Operational Theory 2 Operational Theory 2.1 Introduction The analyzer is composed of three subsystems: 1. Micro-Fuel Cell Sensor 2. Sample System 3. Electronic Signal Processing, Display and Control The sample system is designed to accept the sample gas and transport it through the analyzer without contaminating or altering the sample prior to analysis.
2 Operational Theory Model 3020T analyzed. The Micro-Fuel Cell is therefore a hybrid between a battery and a true fuel cell. (All of the reactants are stored externally in a true fuel cell.) 2.2.2 Anatomy of a Micro-Fuel Cell The Micro-Fuel Cell is a cylinder only 1¼ inches in diameter and 1¼ inches thick. It is made of an extremely inert plastic, which can be placed confidently in practically any environment or sample stream.
Trace Oxygen Analyzer Operational Theory 2 At the top end of the cell is a diffusion membrane of Teflon, whose thickness is very accurately controlled. Beneath the diffusion membrane lies the oxygen sensing element—the cathode—with a surface area almost 4 cm2. The cathode has many perforations to ensure sufficient wetting of the upper surface with electrolyte, and it is plated with an inert metal. The anode structure is below the cathode.
2 Operational Theory Model 3020T The overall reaction for the fuel cell is the SUM of the half reactions above, or: 2Pb + O2 → 2PbO (These reactions will hold as long as no gaseous components capable of oxidizing lead—such as iodine, bromine, chlorine and fluorine—are present in the sample.) The output of the fuel cell is limited by (1) the amount of oxygen in the cell at the time and (2) the amount of stored anode material. In the absence of oxygen, no current is generated. 2.2.
Trace Oxygen Analyzer Operational Theory 2 Figure 2-3. Characteristic Input/Output Curve for a Micro-Fuel Cell 2.3 Sample System The sample system delivers gases to the Micro-Fuel Cell sensor from the analyzer gas panel inlets. Depending on the mode of operation either sample or calibration gas is delivered. The Model 3020T sample system is designed and fabricated to ensure that the oxygen concentration of the gas is not altered as it travels through the sample system.
2 Operational Theory Model 3020T Figure 2-4 is the flow diagram for the sampling system. In the standard instrument, calibration gases (zero and span) can be connected directly to the Sample In port by teeing to the port with appropriate valves. The shaded portion of the diagram shows the components added when the –C and/or F options are ordered. The valves, when supplied, are installed inside the 3020T enclosure and are regulated by the instruments internal electronics.
Trace Oxygen Analyzer Operational Theory 2 Figure 2-5: Block Diagram of the Model 3020T Electronics Teledyne Analytical Instruments 2-7
2 Operational Theory Model 3020T In the presence of oxygen the cell generates a current. A current to voltage amplifier converts this current to a voltage, which is amplified in the second stage amplifier. The second stage amplifier also supplies temperature compensation for the oxygen sensor output. This amplifier circuit incorporates a thermistor, which is physically located in the cell block.
Trace Oxygen Analyzer Installation 3 Installation Installation of the Model 3020T Analyzer includes: 1. Unpacking 2. Mounting 3. Gas connections 4. Electrical connections 5. Installing the Micro-Fuel Cell 6. Testing the system. 3.1 Unpacking the Analyzer The analyzer is shipped with all the materials you need to install and prepare the system for operation. Carefully unpack the analyzer and inspect it for damage. Immediately report any damage to the shipping agent. 3.
3 Installation Model 3020T Figure 3-1: Front View of the Model 3020T (Simplified) 3-2 Teledyne Analytical Instruments
Trace Oxygen Analyzer Installation 3 Figure 3-2: Required Front Door Clearance 3.3 Electrical Connections Figure 3-3 shows the Model 3020T Electrical Connector Panel. There are terminal blocks for connecting power, communications, and both digital and analog concentration outputs.
3 Installation Model 3020T For safe connections, ensure that no uninsulated wire extends outside of the connectors they are attached to. Stripped wire ends must insert completely into terminal blocks. No uninsulated wiring should be able to come in contact with fingers, tools or clothing during normal operation. 3.3.1 Primary Input Power The universal power supply requires a 115 or 230 V ac, 50 or 60 Hz power source.
Trace Oxygen Analyzer Installation 3 Figure 3-5: Analog Output Connections The outputs are: 0–1 V dc % of Range: Voltage rises linearly with increasing oxygen, from 0 V at 0 ppm to 1 V at full scale ppm. (Full scale = 100% of programmable range.) 0–1 V dc Range ID: 0.25 V = Low Range, 0.5 V = Medium Range, 0.75 V = High Range, 1 V = Air Cal Range. 4–20 mA dc % Range: Current increases linearly with increasing oxygen, from 4 mA at 0 ppm to 20 mA at full scale ppm.
3 Installation Model 3020T Table 3-1: Analog Concentration Output—Example ppm O2 Voltage Signal Output (V dc) 0 10 20 30 40 50 60 70 80 90 100 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Current Signal Output (mA dc) 4.0 5.6 7.2 8.8 10.4 12.0 13.6 15.2 16.8 18.4 20.0 To provide an indication of the range, a second pair of analog output terminals are used. They generate a steady preset voltage (or current when using the current outputs) to represent a particular range.
Trace Oxygen Analyzer Installation 3 Figure 3-6: Types of Relay Contacts The connectors are: Threshold Alarm 1: • Can be configured as high (actuates when concentration is above threshold), or low (actuates when concentration is below threshold). • Can be configured as failsafe or nonfailsafe. • Can be configured as latching or nonlatching. • Can be configured out (defeated).
3 Installation Model 3020T ZERO: Floating input. 5 to 24 V input across the + and – terminals puts the analyzer into the Zero mode. Either side may be grounded at the source of the signal. 0 to 1 volt across the terminals allows Zero mode to terminate when done. A synchronous signal must open and close the external zero valve appropriately. See 3.3.9 Remote Sensor and Solenoid Valves. (With the –C option, the internal valves automatically operate synchronously.) SPAN: Floating input.
Trace Oxygen Analyzer Installation 3 Note: The remote probe connections (paragraph 3.3.9) provide signals to ensure that the zero and span gas valves will be controlled synchronously. If you have the –C Internal valve option—which includes additional zero and span gas inputs— the 3020T automatically regulates the zero, span and sample gas flow. 3.3.6 Range ID Relays There are four dedicated RANGE ID CONTACT relays.
3 Installation • • • • Model 3020T The range in use (HI, MED, LO) The span of the range (0-100 ppm, etc) Which alarms—if any—are disabled (AL–x DISABLED) Which alarms—if any—are tripped (AL–x ON). Each status output is followed by a carriage return and line feed. Three input functions using RS-232 have been implemented to date. They are described in Table 3-4. Table 3-4: Commands via RS-232 Input Command Description as Immediately starts an autospan.
Trace Oxygen Analyzer Installation 3 Figure 3-7: Remote Solenoid Return Connector Pinouts The voltage from these outputs is nominally 0 V for the OFF and 15 V dc for the ON conditions. The maximum combined current that can be pulled from these output lines is 100 mA. (If two lines are ON at the same time, each must be limited to 50 mA, etc.) If more current and/or a different voltage is required, use a relay, power amplifier, or other matching circuitry to provide the actual driving current.
3 Installation Model 3020T When the micro-Fuel Cell needs to be installed or replaced, follow the procedures in chapter 5, Maintenance, for removing and installing cells. 3.5 Gas Connections Before using this instrument, it should be determined if the unit will be used for pressurized service or vacuum service and low pressure applications. Inspect the restrictor kit that came with the unit. The kit consist of two restrictors and a union for 1/4” diameter tubing.
Trace Oxygen Analyzer Installation 3 Figure 3-9: Gas Connector Panel SAMPLE IN: In the standard model, gas connections are made at the SAMPLE IN and EXHAUST OUT connections. Calibration gases must be Tee'd into the Sample inlet with appropriate valves. The gas pressure in should be reasonably regulated. Pressures between 3 and 40 psig are acceptable as long as the pressure, once established, will keep the front panel flowmeter reading in an acceptable range (0.1 to 2.4 SLPM).
3 Installation Model 3020T Note: If the unit is for vacuum service, see Sample In, above, for gas pressure/flow considerations. 3.6 Testing the System Before plugging the instrument into the power source: • Check the integrity and accuracy of the gas connections. Make sure there are no leaks. • Check the integrity and accuracy of the electrical connections. Make sure there are no exposed conductors • • Check that sample pressure is between 3 and 40 psig, according to the requirements of your process.
Trace Oxygen Analyzer Operation 4 Operation 4.1 Introduction Once the analyzer has been installed, it can be configured for your application. To do this you will: • • • • • Establish and start an automatic calibration cycle, if desired. (Electrically operated valves required.) Define the three user selectable analysis ranges. Then choose autoranging or select a fixed range of analysis, as required. Calibrate the instrument. Set alarm setpoints, and modes of alarm operation (latching, failsafe, etc).
4 Operation Model 3020T toward UP to move the VFD screen two selections upwards on the list of options (menu). The item that is between arrows on the screen is the item that is currently selectable by choosing ENTER (turn-and-release toward ENTER with the ESCAPE/ENTER control). In these instructions, to ENTER means to turn-and-release toward ENTER, and To ESCAPE means to turn-and-release towards ESCAPE.
Trace Oxygen Analyzer Operation 4 Contrast Function is DISABLED (Refer to Section 1.6) Figure 4-1: Modes and Functions 2 PWD: Used to establish password protection or change the existing password. 3 LOGOUT: Logging out prevents unauthorized tampering with the analyzer settings. VERSION: Displays Manufacturer, Model, and Software version of the instrument. SELF-TEST: The instrument performs a self-diagnostic routine to check the integrity of the power supply, output boards and amplifiers.
4 Operation Model 3020T RANGE: Used to set up three analysis ranges that can be switched automatically with auto-ranging or used as individual fixed ranges. 10 STANDBY: Remove power to outputs and displays, but maintain power to internal circuitry. 9 Any function can be selected at any time. Just scroll through the MAIN MENU with the DOWN/UP control to the appropriate function, and ENTER it. The analyzer will immediately start that function, unless password restrictions have been assigned.
Trace Oxygen Analyzer 4.3 Operation 4 The AUTO-CAL Function When proper automatic valving is connected (see chapter 3, installation), the Analyzer can cycle itself through a sequence of steps that automatically zero and span the instrument. Note: If you require highly accurate AUTO-CAL timing, use external AUTO-CAL control where possible. The internal clock in the Model 3020T is accurate to 2-3 %. Accordingly, internally scheduled calibrations can vary 2-3 % per day.
4 Operation Model 3020T Once a unique password is assigned and activated, the operator MUST enter the UNIQUE password to gain access to any of the set-up functions (except to enter the password). However, the instrument will continue to analyze sample gas and report on alarm conditions without entering the password. • Only one password can be defined. • After a password is assigned, the operator must log out to activate it.
Trace Oxygen Analyzer Operation 4 In a few seconds, if you do not ESCAPE, you will be given the opportunity to change this password or keep it and go on. Change Password? =Yes =No ESCAPE to move on, or proceed as in Changing the Password, below. 4.4.
4 Operation Model 3020T A A A A A Retype PWD To Verify Wait a moment for the entry () screen. You will be given clearance to proceed. A A A A A TO Proceed ENTER the letters of your new password. Your password will be stored in the microprocessor and the system will immediately switch to the ANALYZE screen, and you now have access to all instrument functions. If all alarms are defeated, the ANALYZE screen appears as: 0.
Trace Oxygen Analyzer 4.7 Operation 4 The SELF-TEST Function The Model 3020T has a built-in self-testing diagnostic routine. Preprogrammed signals are sent through the power supply, output 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 OK or as a number between 1 and 3. (See System Self Diagnostic Test in chapter 5 for number code.
4 Operation Model 3020T Although the instrument can be spanned using air, a span gas with a known oxygen concentration in the range of 70–90% of full scale of the range of interest is recommended. Since the oxygen concentration in air is 209,000 ppm, the cell can take a long time to recover if the instrument is used for trace oxygen analysis immediately following calibration in air. Connect the calibration gases to the analyzer according to the instructions given in section 3.
Trace Oxygen Analyzer Operation 4 The beginning zero level is shown in the upper left corner of the display. As the zero reading settles, the screen displays and updates information on Slope (unless the Slope starts within the acceptable zero range and does not need to settle further). Then, and whenever Slope is less than 0.08 for at least 3 minutes, instead of Slope you will see a countdown: 1 Left, 0 Left, and so fourth.
4 Operation Model 3020T 4.8.1.3 Cell Failure Cell failure in the 3020T is usually associated with inability to zero the instrument down to a satisfactorily low ppm reading. When this occurs, the 3020T system alarm trips, and the VFD displays a failure message. #.# ppm Anlz CELL FAIL/ ZERO HIGH Before replacing the cell: a. Check for leaks downstream from the cell, where oxygen may be leaking into the system. b. Check your span gas to make sure it is within specifications. c.
Trace Oxygen Analyzer Operation 4 typing in the concentration of the span gas you are using, repeatedly select ENTER until the rightmost digit is reached, then, the next ENTER will exit the Span Val field. One more ENTER will enter the new span value, bring up the next screen, and start the span calibration. #### ppm Slope=#### Span ppm/s The beginning span value is shown in the upper left corner of the display. As the span reading settles, the screen displays and updates information on Slope.
4 Operation Model 3020T When the Span value displayed on the screen is sufficiently stable, ENTER it. (Generally, when the Span reading changes by 1 % or less of the full scale of the range being calibrated for a period of ten minutes it is sufficiently stable.) Once you ENTER it, the Span reading changes to the correct value. The instrument then automatically enters the ANALYZE function. 4.
Trace Oxygen Analyzer Operation 4 to non-alarm conditions. This mode requires an alarm to be recognized before it can be reset. In the non-latching mode, the alarm status will terminate when process conditions revert to nonalarm conditions. 4. Are either of the alarms to be defeated? The defeat alarm mode is incorporated into the alarm circuit so that maintenance can be performed under conditions which would normally activate the alarms. The defeat function can also be used to reset a latched alarm.
4 Operation Model 3020T –OR – Go to Ltch and then assert either DOWN two times or UP two times. (Toggle it to N and back to Y. Y.) 4.10 The RANGE Function The RANGE function allows the operator to program up to three concentration ranges to correlate with the DC analog outputs. If no ranges are defined by the user, the instrument defaults to: Low = 0–100 ppm Med = 0–1,000 ppm High = 0–10,000 ppm. The Model 3020T is set at the factory to default to autoranging.
Trace Oxygen Analyzer Operation 4 Use the DOWN/UP control to enter the upper value of the range (all ranges begin at 0 ppm). Repeat for each range you want to set. ENTER to accept the values and return to the Analysis Mode. (See note below.) Note: The ranges must be increasing from low to high, for example, if range 1 is set as 0–100 ppm and range 2 is set as 0–1,000 ppm, range 3 cannot be set as 0–500 ppm since it is lower than range 2.
4 Operation Model 3020T output continue to read the true value of the oxygen concentration regardless of the analog output range. 4.11 The CONTRAST Function Contrast Function is DISABLED (Refer to Section 1.6) If you cannot read anything on the display after first powering up: 1. Observe LED readout. a. If LED meter reads all eights and dots, go to step 3. b. If LED meter displays anything else, go to step 2. 2. Disconnect power to the Analyzer and reconnect again.
Trace Oxygen Analyzer Operation 4 4.13 The Analysis Mode This is the normal operating mode of the analyzer. In this mode the analyzer is monitoring the sample, measuring and displaying the amount of oxygen, and reporting alarm conditions. Normally, all of the functions automatically switch back to the Analysis Mode ANALYZE screen when they have completed their assigned operations.
4 Operation 4-20 Model 3020T Teledyne Analytical Instruments
Trace Oxygen Analyzer Maintenance 5 Maintenance 5.1 Routine Maintenance Aside from normal cleaning and checking for leaks at the gas connections, routine maintenance is limited to replacing Micro-Fuel cells and fuses, and recalibration. For recalibration, see Section 4.4 The Zero and Span Functions. WARNING: SEE WARNINGS ON TITLE PAGE OF THIS MANUAL. 5.2 Major Internal Components All internal components are accessed by unbolting and swinging open the front cover, as described earlier.
5 Maintenance Model 3020T Figure 5-1: Major Internal Components To swing open the cover panel, remove all screws. 5.3 Cell Replacement The Micro-Fuel Cell is a sealed electrochemical transducer with no electrolyte to change or electrodes to clean. When the cell reaches the end of its useful life, it is replaced. The spent fuel cell should be discarded in accordance with to all applicable safety and environmental regulations. This section describes fuel cell care as well as when and how to replace it.
Trace Oxygen Analyzer Maintenance 5 5.3.1 Storing and Handling Replacement Cells To have a replacement cell available when it is needed, it is recommended that one spare cell be purchased 9-10 months after commissioning the 3020T, or shortly before the end of the cell's one year warranty period. CAUTION: Do not stockpile cells. The warranty period starts on the day of shipment.
5 Maintenance Model 3020T Before replacing the cell: a. Check your span gas to make sure it is within specifications. b. Check for leaks downstream from the cell, where oxygen may be leaking into the system. If there are no leaks and the span gas is OK, replace the cell. 5.3.3 Removing the Micro-Fuel Cell The Micro-Fuel Cell is located inside the stainless steel cell block behind the front panel (see Figure 5-1). To remove an existing cell: 1.
Trace Oxygen Analyzer Maintenance 5 Lift Up Gate Figure 5-2: Exploded View of Cell Block and Micro-Fuel Cell Teledyne Analytical Instruments 5-5
5 Maintenance Model 3020T 5.3.4 Installing a New Micro-Fuel Cell It is important to minimize the amount of time that a Teledyne Trace Oxygen Sensor is exposed to air during the installation process. The quicker the sensor can be installed into the unit, the faster your TAI O2 sensor will recover to low O2 measurement. levels. CAUTION: Do not touch the sensing surface of the cell. It is covered with a delicate Teflon membrane that can leak when punctured.
Trace Oxygen Analyzer Maintenance 5 5.3.5 Cell Warranty The Class L-2C Micro-Fuel cell is used in the Model 3020T. This cell is a long life cell and is warranted for 1 year from the date of shipment. If any other cell is supplied with your instrument, check the front of this manual for any special information applying to your cell. With regard to spare cells, warranty period begins on the date of shipment. The customer should purchase only one spare cell (per section 5.3.1).
5 Maintenance Model 3020T Figure 5-3: Removing Fuse Cap and Fuse from Holder 2. Replace fuse by reversing process in step 1. 5.5 System Self Diagnostic Test Use the DOWN/UP control to scroll through the MAIN MENU to SELF-TEST. The screen will follow the running of the diagnostic. RUNNING DIAGNOSTIC Testing Preamp 83 During preamp testing there is a countdown in the lower right corner of the screen. When the testing is complete, the results are displayed.
Trace Oxygen Analyzer Maintenance 5 Table 5-1: Self Test Failure Codes Power 0 1 2 3 OK 5 V Failure 15 V Failure Both Failed Analog 0 1 2 3 OK DAC A (0–1 V Concentration) DAC B (0–1 V Range ID) Both Failed Preamp 0 1 2 3 OK Zero too high Amplifier output doesn't match test input Both Failed Teledyne Analytical Instruments 5-9
5 Maintenance 5-10 Model 3020T Teledyne Analytical Instruments
Trace Oxygen Analyzer Appendix Appendix A-1 Specifications Packaging: Explosion-proof. Bulkhead mount. Sensor: L-2C trace analysis Micro-Fuel Cell. Cell Block: 316 stainless steel. Ranges: Three user definable ranges from 0–10 ppm to 0–250,000 ppm, plus air calibration range of 0250,000 ppm (25 %). Autoranging with range ID output. Sample System: Flow indicator visible from front of unit. Positive pressure service. Vacuum service (optional). Auto Cal / Auto Zero.
Appendix Model 3020T Operating Temperature: 0-50 °C Accuracy: ±2% of full scale at constant temperature. ±5% of full scale over operating temperature range, on factory default analysis ranges, once thermal equilibrium has been achieved. Analog outputs: 0-1 V dc percent-of-range 0-1 V dc range ID. 4-20 mA dc percent-of-range 4-20 mA dc range ID. Password Access: Can be user-configured for password protection.
Trace Oxygen Analyzer Appendix A-2 Recommended 2-Year Spare Parts List Qty Part Number Description 1 C62371B Display PCB 1 D65295A Customer Interface PCB 1 C62368-A Trace Preamplifier Board 1 C62365-A Main PCB 3 F1295 Fuse, 4A, 250V, 5x20 mm, T (Slow 1 O165 O-ring 1 C6689-L2C Micro-Fuel Cell Blow) A minimum charge is applicable to spare parts orders.
Appendix Model 3020T A-3 Drawing List D65908 D65909 D65911 A-4 Final Assembly Drawing Outline Drawing Wiring Diagram Teledyne Analytical Instruments
Trace Oxygen Analyzer A-4 Appendix 3000 SERIES ANALYZERS APPLICATION NOTES ON RESTRICTORS, PRESSURES, AND FLOW RECOMMENDATIONS 3000 series analyzers require reasonably regulated sample pressures. While the 3000 analyzers are not sensitive to variations of incoming pressure (provided they are properly vented to atmospheric pressure) the pressure must be maintained as to provide a useable flow rate trough the analyzer. Any line attached to sample vent should be 1/4 or larger in diameter.
Appendix Model 3020T The second function that the restriction device provides is a pressure drop. This device is selected to provide the only significant pressure drop in the sample path. RESTRICTOR KIT The current revision of the 3000 series analyzers are supplied with a kit containing two restrictors and a union which are user installed. These parts supplied to give the end user more flexibility when installing the analyzer.
Trace Oxygen Analyzer Appendix BY-PASS: To improve the system response, a by-pass can be added to increase the sample flow rate to the analyzer by a factor of ten. A by-pass provides a sample flow path around the analyzer of 2 - 18 SCFH. typically. CALIBRATION GAS: 3000 series analyzer requirements for units with Auto-Cal options. The customer must supply a control valves (or restrictors) for any SPAN or ZERO gas source which is attached to the Auto-Cal ports.