Thermal Conductivity Analyzer OPERATING INSTRUCTIONS FOR Model 2000A-EU Thermal Conductivity 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 2000A-EU 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.
Thermal Conductivity 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 is supplied are indicated by a check mark in the box.
Model 2000A-EU Model 2000A-EU complies with all of the requirements of the Commonwealth of Europe (CE) for Radio Frequency Interference, Electromagnetic Interference (RFI/EMI), and Low Voltage Directive (LVD).
Thermal Conductivity Analyzer Table of Contents 1 Introduction 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Overview ........................................................................ 1-1 Typical Applications ....................................................... 1-2 Main Features of the Analyzer ....................................... 1-2 Model Designations ....................................................... 1-3 Front Panel (Operator Interface) .....................................
Model 2000A-EU 3.4.5 REFERENCE Gas ................................................ 3-15 3.4.6 ZERO Gas ............................................................. 3-15 3.4.7 SPAN Gas .............................................................. 3-15 3.5 Testing the System ......................................................... 3-16 3.6 Warm Up at Power Up .................................................... 3-16 4 Operation 4.1 Introduction ............................................................
Thermal Conductivity Analyzer 4.9.2 4.9.3 4.9.4 Special - Inverting Output ...................................... 4-29 Special - Polarity Coding ....................................... 4.29 Special - Nonlinear Application Gain Preset.......... 4-29 Maintenance 5.1 Routine Maintenance ..................................................... 5-1 5.2 System Self Diagnostic Test ........................................... 5-1 5.3 VFD Display ..................................................................
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Thermal Conductivity Analyzer Introduction 1 Introduction 1.1 Overview The Analytical Instruments Model 2000 Thermal Conductivity Analyzer is a versatile microprocessor-based instrument for measuring a component gas in a background gas, or in a specific mixture of background gases. 2000A-EU Analyzer complies with all of the requirements of the Comonwealth of Europe (CE) for Radio Frequency Interference and Electromagnetic Interfaces (RFI/EMI) protection.
1 Introduction 1.2 Model 2000A-EU Typical Applications A few typical applications of the Model 2000 are: • Power Generation • Air liquefaction • Chemical reaction monitoring • Steel manufacturing and heat treating • Petrochemical process control • Quality assurance • Refrigeration and storage • Gas proportioning control. 1.
Thermal Conductivity Analyzer Introduction 1 • Microprocessor based electronics: 8-bit CMOS microprocessor with 32 kB RAM and 128 kB ROM. • Auto and remote calibration capabilities. • CE Mark Certified. • Four analog outputs: two for measurement (0–1 V dc and Isolated 4–20 mA dc) and two for range identification. • Compact and versatile design: Small footprint, yet internal components are accessible. 1.
1 Introduction Model 2000A-EU Figure 1-1: Model 2000A Front Panel • System Perform system-related tasks (described in detail in chapter 4, Operation.). • Span Span calibrate the analyzer. • Zero Zero calibrate the analyzer. • Alarms Set the alarm setpoints and attributes. • Range Set up the user definable ranges for the instrument.
Thermal Conductivity Analyzer • Introduction 1 Escape Moves VFD back to the previous screen in a series. If none remains, returns to the Analyze screen. 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 trace readout from 0-9999 ppm or a continuous percent readout from 1-100 %. It is accurate across all analysis ranges.
1 Introduction Model 2000A-EU Figure 1-2: Model 2000A-EU Rear Panel 1-6 • Power Connection Universal AC power source. • 9-Pin RS-232 Port Serial digital concentration signal output and control input. • 50-Pin Equipment Interface Port • Analog Outputs 0-1 V dc concentration plus 0-1 V dc range ID, and isolated 4-20 mA dc plus 4-20 mA dc range ID. • Alarm Connections 2 concentration alarms and 1 system alarm.
Thermal Conductivity Analyzer Introduction 1 Note: If you require highly accurate Auto-Cal timing, use external Auto-Cal control where possible. The internal clock in the Model 2000 is accurate to 2-3 %. Accordingly, internally scheduled calibrations can vary 2-3 % per day. 1.8 Gas Connections The gas connectors are on the bottom of the Model 2000A chassis near the front panel. There are no gas control valves inside the main chassis.
1 Introduction 1-8 Model 2000A-EU Teledyne Analytical Instruments
Thermal Conductivity Analyzer Operational Theory 2 Operational Theory 2.1 Introduction The analyzer is composed of two subsystems: 1. Thermal Conductivity Sensor 2. Electronic Signal Processing, Display and Control. The sensor is a thermal conductivity comparator that continuously compares the thermal conductivity of the sample gas with that of a reference gas having a known conductivity.
2 Operational Theory Model 2000A-EU Figure 2-1: Thermal Conductivity Cell Operating Principle If the thermal conductivities of the gases in the two chambers are different, the Wheatstone bridge circuit unbalances, causing a current to flow in its detector circuit. The amount of this current can be an indication of the amount of impurity in the sample gas, or even an indication of the type of gas, depending on the known properties of the reference and sample gases.
Thermal Conductivity Analyzer Operational Theory 2 2.2.3 Effects of Flowrate and Gas Density Because the flowrate of the gases in the chambers affects their cooling of the heated filaments, the flowrate in the chambers must be kept as equal, constant, and low as possible. When setting the sample and reference flowrate, note that gases lighter than air will have an actual flowrate higher than indicated on the flowmeter, while gases heavier than air will have an actual flowrate lower than indicated.
2 Operational Theory Model 2000A-EU The Preamplifier board is mounted on top of the Motherboard as shown in the figure (in chapter 5). These boards are accessible after removing the back panel. Figure 2-2 is a block diagram of the Analyzer electronics.
Thermal Conductivity Analyzer Operational Theory 2 The Temperature Control Board keeps the temperature of the measuring cell regulated to within 0.1 degree C. A thermistor is used to measure the temperature, and a zero-crossing switch regulates the power in a cartridge-type heater. The result is a sensor output signal that is temperature independent. In the presence of dissimilar gases the sensor generates a differential voltage across its output terminals.
2 Operational Theory 2-6 Teledyne Analytical Instruments Model 2000A-EU
Thermal Conductivity Analyzer Installation 3 Installation Installation of the Model 2000A Analyzer includes: 1. Unpacking 2. Mounting 3. Gas connections 4. Electrical connections 5. Installing the Sensor 6. Testing the system. 3.1 Unpacking the Analyzer The analyzer is shipped ready to install and prepare for operation. Carefully unpack the analyzer and inspect it for damage. Immediately report any damage to the shipping agent.
3 Installation Model 2000A-EU are four mounting holes—one in each corner of the rigid frame. Figure 3-1a contains the hole pattern dimensions. See the outline drawing, at the back of this manual for overall dimensions. On special order, a 19" rack-mounting panel can be provided. For rack mounting, one or two 2000A series analyzers are flush-panel mounted on the rack panel. See Figure 3-1b for dimensions of the mounting panel. 6.
Thermal Conductivity Analyzer Installation 3 All operator controls are mounted on the control panel, which is hinged on the left edge and doubles as the door that provides access to the sensor inside the instrument. The door is spring loaded and will swing open when the button in the center of the latch (upper right corner) is pressed all the way in with a narrow gauge tool (less than 4.
3 Installation Model 2000A-EU For safe connections, no uninsulated wiring should be able to come in contact with fingers, tools or clothing during normal operation. CAUTION: Use Shielded Cables. Also, use plugs that provide excellent EMI/RFI protection. The plug case must be connected to the cable shield, and it must be tightly fastened to the analyzer with its fastening screws. Ultimately, it is the installer who ensures that the connections provide adequate EMI/RFI shielding. 3.3.
Thermal Conductivity Analyzer Installation 3 Figure 3-4: Equipment Interface Connector Pin Arrangement 3.3.3.1 Analog Outputs There are four DC output signal pins—two pins per output. For polarity, see Table 3-1. The outputs are: 0–1 V dc % of Range: Voltage rises linearly with increasing concentration, from 0 V at 0 concentration to 1 V at full scale. (Full scale = 100% of programmable range.) 0–1 V dc Range ID: 0.25 V = Range 1, 0.5 V = Range 2, 0.75 V = Range 3, 1 V = Cal Range.
3 Installation Model 2000A-EU The signal output for concentration is linear over the currently selected analysis range. For example, if the analyzer is set on a range that was defined as 0–10 % hydrogen, then the output would be as shown in Table 3-2. Table 3-2: Analog Concentration Output—Example Percent Hydrogen Voltage Signal Output (V dc) 0 1 2 3 4 5 6 7 8 9 10 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.
Thermal Conductivity Analyzer Installation 3 capable of switching up to 3 amperes at 250 V ac into a resistive load. 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 2000A-EU Zero: Floating input. A 5 to 24 V pulse input across the + and – pins puts the analyzer into the Zero mode. Either side may be grounded at the source of the signal. A synchronous signal must open and close the gas control valves appropriately. See 3.3.3.6 Remote Probe Connector. (With the –C option the internal valves operate automatically.) Span: Floating input. A 5 to 24 V pulse input across the + and – pins puts the analyzer into the Span mode.
Thermal Conductivity Analyzer Installation 3 3) When CRC opens again, send a span command until the CRC closes. (The CRC will close quickly.) 4) When the CRC closes, remove the span command. When CRC opens again, zero and span are done, and the sample is being analyzed. Note: The Remote Probe connector (paragraph 3.3.3.6) provides signals to operate the zero and span gas valves synchronously.
3 Installation Model 2000A-EU Figure 3-5: Remote Probe 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.
Thermal Conductivity Analyzer • • • • Installation 3 The range in use (00 = Range 1, 01 = Range 2, 10 = Range 3, 11 = Range 4) The span of the range (0-100 %, 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. Input: The input functions using RS-232 that have been implemented to date are described in Table 3-7.
3 Installation Model 2000A-EU Figure 3-8: Gas Connections to the Basic Unit If you have purchased a gas control panel from Analytical Instruments, the drawings at the back of this manual will contain a dimension outline drawing, with the modified cutout and hole pattern for mounting, and a drawing and/or addendum showing the gas connections.
Thermal Conductivity Analyzer 3.4.1 Installation 3 Sample System Design Gas Connector and Control Panels for specific applications are available as extra cost additions. These panels are usually designed around a standard manifold that attaches to the Model 2000A series analyzer below the front panel.
3 Installation Model 2000A-EU When installing pressure regulators on supply cylinders, crack the cylinder valves so that gas is flowing during installation. This will eliminate the most common cause of standardization-gas contamination: air trapped during assembly diffusing back into the cylinder. This procedure is particularly important in applications where impurity content of 1 to 2 % is the range of interest.
Thermal Conductivity Analyzer Installation 3 3.4.5 REFERENCE Gas A gas of fixed composition is needed as a reference to which the sample gas will be compared. The reference gas is normally selected to represent the main background gas of the analysis. For most applications, a constant supply of reference gas flowing at the same rate as the sample is required for best results. However, in many cases the flow of reference gas can be slowed to about 0.08 scfh (40 cc/min) with good results.
3 Installation Model 2000A-EU used, depending on the desired precision of the linearization. See chapter 4, Operation. 3.5 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.
Thermal Conductivity Analyzer Operation 4 Operation 4.1 Introduction Although the Model 2000 is usually programmed to 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 subset of the following procedures: • Setting system parameters: • Establish a security password, if desired, requiring Operator to log in.
4 Operation Model 2000A-EU The Enter button is used to accept any new entries on the VFD screen. The Escape button is used to abort any new entries on the VFD screen that are not yet accepted by use of the Enter button. Figure 4-1 shows the hierarchy of functions available to the operator via the function buttons. The six function buttons on the analyzer are: • Analyze. This is the normal operating mode.
Thermal Conductivity Analyzer Operation 4 System Contrast Function is DISABLED CONTRAST Set LCD Contrast AUTO-CAL Span/Zero Off/On Span/Zero Timing PASSWORD Enter Password Change Yes/No LOGOUT (Refer to Section 1.
4 Operation Model 2000A-EU the appropriate point in the procedure, in a Monospaced type style. Pushbutton names are printed in Oblique type. 4.3 The System Function The subfuctions of the System function are described below. Specific procedures for their use follow the descriptions: • • • • • • • • 4-4 AUTO-CAL: Used to define an automatic calibration sequence and/or start an AUTO-CAL. PWD: Security can be established by choosing a 3 digit password (PWD) from the standard ASCII character set.
Thermal Conductivity Analyzer Operation 4 4.3.1 Setting the Display 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 8.8.8.8.8., go to step 3. b. If LED meter displays anything else, go to step 2. 2. Press button twice to turn Analyzer OFF and ON again. LED meter should now read 8.8.8.8.8.. Go to step 3. 4.3.
4 Operation Model 2000A-EU ZERO in Ød Øh off SPAN in Ød Øh off Press < > arrows to blink SPAN (or ZERO), then press Enter again. (You won’t be able to set OFF to ON if a zero interval is entered.) A Span Every ... (or Zero Every ...) screen appears. Zero schedule: OFF Day: Ød Hour: Øh Use ∆ ∇ arrows to set an interval value, then use < > arrows to move to the start-time value. Use ∆ ∇ arrows to set a start-time value.
Thermal Conductivity Analyzer Operation 4 Contrast Function is DISABLED CONTRAST (Refer to Section 1.6) PWD LOGOUT AUTOCAL MORE Use the < > arrow keys to scroll the blinking over to PWD, and press Enter to select the password function. Either the default TAI password or AAA place holders for an existing password will appear on screen depending on whether or not a password has been previously installed. Enter password: TAI or Enter password: AAA The screen prompts you to enter the current password.
4 Operation Model 2000A-EU Enter the password using the < > arrow keys to move back and forth between the existing password letters, and the ∆ ∇ arrow keys to change the letters to the new password. The full set of 94 characters available for password use are shown in the table below. Characters Available for Password Definition: A K U _ i s } ) 3 = B L V ` j t → * 4 > C M W a k u ! + 5 ? D N X b l v " ' 6 @ E O Y c m w # 7 F P Z d n x $ .
Thermal Conductivity Analyzer Operation 4 4.3.4 Logging Out The LOGOUT function provides a convenient means of leaving the analyzer in a password protected mode without having to shut the instrument off. By entering LOGOUT, you effectively log off the instrument leaving the system protected against use until the password is reentered. To log out, press the System button to enter the System function. Contrast Function is DISABLED (Refer to Section 1.
4 Operation Model 2000A-EU Power: OK Analog: OK Cell: 2 Preamp: 3 The module is functioning properly if it is followed by OK. A number indicates a problem in a specific area of the instrument. Refer to Chapter 5 Maintenance and Troubleshooting for number-code information. The results screen alternates for a time with: Press Any Key To Continue... Then the analyzer returns to the initial System screen. 4.3.6 The Model Screen Move the < > arrow key to MORE and press Enter.
Thermal Conductivity Analyzer Operation 4 The OUTPUT value is the output of the linearizer. It should be the ACTUAL concentration of the span gas being simulated. If the OUTPUT value shown is not correct, the linearization must be corrected. Press ESCAPE to return to the previous screen. Select and ENTER SET UP to Calibration Mode screen.
4 Operation Model 2000A-EU Note: Shut off the gas pressure before connecting it to the analyzer, and be sure to limit pressure to 40 psig or less when turning it back on. Readjust the gas pressure into the analyzer until the flowrate through the sensor settles between 50 to 200 cc/min (approximately 0.1 to 0.4 scfh). 4.4.1 Zero Cal The Zero button on the front panel is used to enter the zero calibration function. Zero calibration can be performed in either the automatic or manual mode.
Thermal Conductivity Analyzer Operation 4 Then, and whenever Slope is less than 0.01 for at least 3 min, instead of Slope you will see a countdown: 9 Left, 8 Left, and so fourth. These are software steps in the zeroing process that the system must complete, AFTER settling, before it can go back to Analyze. Software zero is indicated by S Zero in the lower right corner.
4 Operation Model 2000A-EU Generally, you have a good zero when Slope is less than 0.05 ppm/s for about 30 seconds. Once zero settling completes, the information is stored in the analyzer’s memory, and the instrument automatically returns to the Analyze mode. 4.4.1.3 Cell Failure Cell failure in the 2000 is usually associated with inability to zero the instrument with a reasonable voltage differential across the Wheatstone bridge.
Thermal Conductivity Analyzer Operation 4 arrow keys to toggle between AUTO and MAN span settling. Stop when AUTO appears, blinking, on the display. Select span mode: AUTO Press Enter to move to the next screen. Span Val: 2Ø.ØØ % To begin span Use the < > arrow keys to toggle between the span concentration value and the units field (%/ppm). Use the ∆ ∇ arrow keys change the value and/or the units, as necessary.
4 Operation Model 2000A-EU Once the span has begun, the microprocessor samples the output at a predetermined rate. It calculates the difference between successive samplings and displays this difference as Slope on the screen. It takes several seconds for the first Slope value to display. Slope indicates rate of change of the Span reading. It is a sensitive indicator of stability. ##### % O2 Air Slope=#### Span When the Span value displayed on the screen is sufficiently stable, press Enter.
Thermal Conductivity Analyzer Operation 4 In failsafe mode, the alarm relay de-energizes in an alarm condition. For non-failsafe operation, the relay is energized in an alarm condition. You can set either or both of the concentration alarms to operate in failsafe or non-failsafe mode. 3. Are either of the alarms to be latching? In latching mode, once the alarm or alarms trigger, they will remain in the alarm mode even if process conditions revert back to non-alarm conditions.
4 Operation • • • • Model 2000A-EU • Value of the alarm setpoint, AL–1 #### • Out-of-range direction, HI or LO • Defeated? Dft:Y/N (Yes/No) • Failsafe? Fs:Y/N (Yes/No) • Latching? Ltch:Y/N (Yes/No). To define the setpoint, use the < > arrow keys to move the blinking over to AL–1 ####. Then use the ∆∇ arrow keys to change the number. Holding down the key speeds up the incrementing or decrementing. To set the other parameters use the < > arrow keys to move the blinking over to the desired parameter.
Thermal Conductivity Analyzer Operation 4 4.6.1 Manual (Select/Define Range) Screen The Manual range-switching mode allows you to select a single, fixed analysis range. It then allows you to redefine the upper and lower limits, for the range. Press Range key to start the Range function. Select range mode: MANUAL Note: If all three ranges are currently defined for different application gases, then the above screen does not display (because mode must be manual).
4 Operation Model 2000A-EU The autoranging feature can be overridden so that analog output stays on a fixed range regardless of the contaminant concentration detected. If the concentration exceeds the upper limit of the range, the DC output will saturate at 1 V dc (20 mA at the current output). However, the digital readout and the RS-232 output of the concentration are unaffected by the fixed range. They continue to read beyond the full-scale setting until amplifier saturation is reached.
Thermal Conductivity Analyzer Operation 4 Ranges that work well together are: • Ranges that have the same lower limits but upper limits that differ by approximately an order of magnitude • Ranges whose upper limits coincide with the lower limits of the next higher range • Ranges where there is a gap between the upper limit of the range and the lower limit of the next higher range.
4 Operation Model 2000A-EU right corner, the abbreviation Anlz indicates that the analyzer is in the Analyze mode. If there is an * before the Anlz, it indicates that the range is linearized. 19.3 % O2 Air R: ØØ:Ø 17 *Anlz If the concentration detected is overrange, the first line of the display blinks continuously. 4.8 Programming CAUTION: The programming functions of the Set Range and Curve Algorithm screens are configured at the factory to the users application specification.
Thermal Conductivity Analyzer Operation 4 4.8.1 The Set Range Screen The Set Range screen allows reprogramming of the three analysis ranges and the calibration range (including impurity gas, background gas, low end of range, high end of range, and % or ppm units). Original programming is usually done at the factory according to the customer’s application. It must be done through the RS-232 port using a computer running a terminal emulation program.
4 Operation Model 2000A-EU Use the < > arrow keys again to move the blinking to APPLICATION and press Enter. Select rng to set appl: > Ø1 Ø2 Ø3 CAL < Use the ∆∇ arrow keys to increment/decrement the range number to 0, 1, 2, or 3, and press Enter. Imp: Ø2 Bck: N2 FRØ TO1ØØ % Use the < > arrow keys to move to Imp: (impurity), Bck: (background), FR: (from—lower end of range), TO: (to—upper end of range), and PPM or %. Use the ∆∇ arrow keys to increment the respective parameters as desired.
Thermal Conductivity Analyzer Operation 4 ized during calibration, to ensure a straight-line input/output transfer function through the analyzer. Each range is linearized individually, as necessary, since each range will usually have a totally different linearization requirement. Before setting the algorithm curve, each range must be Zeroed and Spanned. To linearize the ranges, you must first perform the four steps indicated at the beginning of section 4.8 Programming.
4 Operation Model 2000A-EU Select algorithm mode : AUTO There are two ways to linearize: AUTO and MANUAL: The auto mode requires as many calibration gases as there will be correction points along the curve. The user decides on the number of points, based on the precision required. The manual mode only requires entering the values for each correction point into the microprocessor via the front panel buttons. Again, the number of points required is determined by the user. Note: Before performing section 4.
Thermal Conductivity Analyzer Operation 4 Repeat the above procedure for each of the data points you are setting (up to nine points: 0-8). Set the points in unit increments. Do not skip numbers. The linearizer will automatically adjust for the number of points entered. When you are done, Press ESCAPE. The message, Completed. Wait for calculation, appears briefly, and then the main System screen returns.
4 Operation Model 2000A-EU st st to the analyzer from the computer. If started through the front panel, turn the instrument off and back on. Press the Enter key twice to return to the Analyze mode. 4.9 Special Function Setup 4.9.1 Output Signal Reversal Some applications require a reversal of the output signals in order for the 4-20mA and 0-1 V DC output signals to correspond with the low and high end of the concentration range.
Thermal Conductivity Analyzer 4. Operation 4 Press ENTER key. NOTE: If the inverting has been setup, “i” shall display on the left bottom corner. Otherwise, the left bottom corner display ”n”. If more that one range as specified as inverting output, repeat steps 1 to 4. 4.9.3 Special - Polarity Coding NOTE: This setup will be identified only when performing GAS TEST or calculation. The formula 1 will determine the range(s) is required polarity coding.
4 Operation Model 2000A-EU 6. Press and hold the RIGHT key for approximate 5 to 7 seconds. 7. Select AUTO and set the reading to span gas level. Press ENTER key. Repeat steps 1 to 7 if more than two ranges need to be setup.
Thermal Conductivity 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 fuses, and recalibration. For recalibration, see Section 4.4 Calibration. WARNING: SEE WARNINGS ON THE TITLE PAGE OF THIS MANUAL. 5.2 System Self Diagnostic Test 1. Press the System button to enter the system mode. 2. Use the < > arrow keys to move to More, and press Enter. 3.
5 Maintenance Model 2000A-EU Preamp 0 1 2 3 OK Zero too high Amplifier output doesn't match test input Both Failed Cell 5.3 NOTE: 0 OK 1 Failed (open filament, short to ground, no power.) 2 Unbalance (deterioration of filaments, blocked tube) VFD Display Vaccum Fluorescent Display is used. It does not need contrast adjustment. If you cannot read anything on the VFD, especially after first powering up, check thead VFD cable is not loose. 5.4 Fuse Replacement 1.
Thermal Conductivity Analyzer Maintenance 5 3. Replace fuse as shown in Figure 5-2. 4. Reassemble Housing as shown in Figure 5-1. American Fuses European Fuses Figure 5-2: Installing Fuses 5.5 Major Internal Components The Cell Compartment and Front Panel PCBs are accessed by unlatching and swinging open the front panel, as described earlier. The balance of the PCBs are accessed by removing the rear panel retaining screws and sliding out the entire subassembly. See Figure 5-3, below.
5 Maintenance X Model 2000A-EU X X X X X X X X X Figure 5-3: Rear Panel Retaining Screws To detach the rear panel, remove only those screws marked with an X. Figure 5-4: Locations of Printed Circuit Board Assemblies See the drawings in the Drawings section in back of this manual for details.
Thermal Conductivity Analyzer 5.6 Maintenance 5 Cell, Heater, and/or Thermistor Replacement The Thermal Conductivity Cell, with its Heater and Thermistor, is mounted inside the insulated cell compartment, just behind the analyzer's front panel access door. To remove the one of these components, you must first slide the entire Cell Compartment out of the analyzer through the front panel access door as described in the procedure below.
5 Maintenance Model 2000A-EU b. Remove analyzer from its mounting, and remove gas fittings from the gas ports on the bottom of the analyzer, so that nothing projects from the ports. c. Remove the Cell Compartment retaining screws identified in Figure 5-5. You will have to unlatch and swing open the front panel door to remove the front screws. d. Carefully pull the Cell Compartment out through the front of the analyzer. There is enough length to the cell's electrical wiring to allow this. e.
Thermal Conductivity Analyzer Maintenance 5 c. Turn the uncovered Cell Block assembly over so that the bottom faces you. The black rectangular block with four screws is the Heater Block. Separate the Heater Block and Insulator from the Cell Block by removing the four screws. Leave the Heater Block electrical connections connected. d. Remove the four screws from each of the black plates that hold the Cell. The Cell is sandwiched between the plates. You should now be able to slide the Cell free. e.
5 Maintenance Model 2000A-EU d. The Heater is fastened to the Heater Block by a set screw as well as the silicone sealing compound. The Thermistor is fastened only by the silicone sealer. (1) To remove the Heater, use a 1/16 ″ Allen wrench to loosen the Thermistor set screw. Then, grasp BOTH Heater wires firmly, and pull the Heater slowly out of the Heater Block, breaking the silicone seal. Do not allow any foreign matter to enter the empty duct.
Thermal Conductivity Analyzer Maintenance 5 For mounted instruments, DO NOT wipe the front panel while the instrument is controlling your process. Clean the front panel as prescribed in the above paragraph. 5.
5 Maintenance 5-10 Model 2000A-EU Teledyne Analytical Instruments
Thermal Conductivity Analyzer Appendix Appendix A-1 Specifications Ranges: Three ranges plus a cal range, field selectable within limits (application dependent) and Auto Ranging Display: 2 line by 20 alphanumeric VFD accompanied by 5 digit LED display Accuracy: ±1% of full scale for most binary mixtures at constant temperature ±5% of full scale over operating temperature range once temperature equilibrium has been reached Response Time: 90% in less than 50 seconds System Operating Temperature: 32°F to 12
Appendix Models 2000A-EU System Power Requirements: 110 VAC, 50-60Hz Dimensions: 7.5”H x 10.8 “w X 13.
Thermal Conductivity Analyzer Appendix A-2 Recommended 2-Year Spare Parts List Qty Part Number Description 1 C65507A Back Panel Board 1 C62371A Front Panel Board 1 C65098 Preamplifier Board 1 C73870D Main Computer Board 1 B68772 Temp Control Board 1* F9 Fuse, 1 A, 250 V, 3AG, Slow Blow, (US) 2* F1275 Fuse, 1 A, 250 V, 5 × 20 mm, T—Slow Blow, (European) 1 CP1798 Plug, 50 pin D-sub Connector 1 CP1802 Shielded Cable Clamp 50 CP1799 Solder Cup Contact, for CP1798 _____________
Appendix Models 2000A-EU CALIBRATION PROCEDURE FOR Models 2000 & 2010 ANALYZER ForTURBINEGENERATORAPPLICATION The ranges for this analyzer are: Range 1: 0-100% Air in CO2 Range 2: 0-100% H2 in CO2 Range 3: 80-100% H2 in Air Cal Range: 0-20% N2-H2 The following instructions show how to calibrate each range in the analyzer independently. If all ranges must be calibrated using the Cal range, go to the cal range calibration section and following the instructions.
Thermal Conductivity Analyzer Appendix 7 Press the SPAN button, press the arrow > hold it until OK appears on the upper right corner of the VFD display. 8 You have the option to select AUTO or MANual. AUTO lets the analyzer adjust itself and may take longer while in MANual mode the operator has only to press Enter when he thinks the reading is stable enough. Set the Span value to 100.00%.
Appendix Models 2000A-EU 6 When the analyzer finishes the zero, feed the span gas and purge for the time needed to get readings that are leveled. Feed H2 to the analyzer. 7 Press the SPAN button, press the arrow > hold it until OK appears on the upper right of the VFD display. 8 You have the option to select AUTO or MANual. AUTO lets the analyzer adjust itself and may take longer while in MANual mode the operator has only to press Enter when he thinks the reading is stable enough.
Thermal Conductivity Analyzer Appendix Now the analyzer will do the final step which is the Software zero adjustment. No input is required and the analyzer will return automatically to the Analyze mode when done. 6 When the analyzer finishes zero, feed span gas and purge for the time needed to get readings that are leveled. Feed 90% H2 in air to the analyzer. 7 Press the SPAN button, press the arrow > hold until OK appears on the upper right corner of the VFD display.
Appendix Models 2000A-EU Now the analyzer will do the final step which is the Software zero adjustment. No input is required and the analyzer will return automatically to the Analyze mode when done. 5 When the analyzer finishes the zero, feed the span gas and purge for the time needed to get readings that are leveled. Feed 10% Air in H2 (90% H2 in air) to the analyzer 6 Now select the SPAN function from the main menu and press Enter. If you want to calibrate only the Cal Range: select MANual.