Infrared Gas Analyzer OPERATING INSTRUCTIONS Model 7300A Infrared Gas Analyzer 7300 S E R IE S -R E D AN IN F R A A LY Z E R 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 7300A Copyright © 2000 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 917491580.
Infrared Gas Analyzer Technician Record Sheet The following data is recorded by the technitian at the end of the testing of the analyzer: APPLICATION (IMPURITY OF INTEREST):__________________ RANGE 1: FROM____________ TO___________ % / PPM (circle one) RANGE 2: FROM____________ TO___________ % / PPM (circle one) RANGE 3: FROM____________ TO___________ % / PPM (circle one) RANGE 4: FROM____________ TO___________ % / PPM (circle one) FILTER: __________________ CALIB_FACTOR: __________________ HARD_OFFSE
Model 7300A iv Teledyne Analytical Instruments
Table of Contents OPERATING INSTRUCTIONS Model 7300A Infrared Gas Analyzer Table of Contents General Purpose Teledyne Analytical Instruments i
Model 7300A Infrared Gas Analyzer Table of Contents 1 Introduction 1.1 1.2 1.3 1.4 1.5 Overview ........................................................................ 1-1 Typical Gas Applications ................................................ 1-1 Main Features of the Analyzer ....................................... 1-2 General .......................................................................... 1-3 NDIR Analyzer ...............................................................
Table of Contents 3 Start-up and Theory of Operation ......................................... 3-1 3.1 Preliminary ..................................................................... 3-1 3.2 NDIR Analyzer set-up .................................................... 3-1 3.2.1 Initial Set-up and Zeroing ...................................... 3-1 3.2.2 Operational Calibration ......................................... 3.2 3.3 Theory of Operation ....................................................... 3-2 3.3.
Model 7300A Infrared Gas Analyzer 4.4.2 Span Cal ................................................................ 4-19 4.4.2.1 Auto Mode Spanning ..................................... 4-19 4.4.2.2 Manual Mode Spanning ................................. 4-20 4.5 The Alarms Function ...................................................... 4-21 4.6 The Range Select Function ........................................... 4-23 4.6.1 Manual (Select/Define Range) Screen .................. 4-23 4.6.2 Auto Screen .......
Infrared Gas Analyzer Introduction 1 1.0 Introduction 1.1 Overview The Teledyne Analytical Instruments Model 7300A Analyzer, is a versatile microprocessor-based instrument. The manual covers the Model 7300A General Purpose 19” Panel/Rack mounted analyzer. Consisting of an Analysis section and Control Unit section. The 7300A Analyzer is for indoor or protected use in General Purpose environments only. 1.
1 Introduction 1.3 Model 7300A Main Features of the Analyzer The Model 7300A Infrared Gas Analyzer is sophisticated yet simple to use. The main features of the analyzer include: • A easy-to-use front panel interface that includes a red 5-digit LED display and a vacuum fluorescent display, driven by microprocessor electronics, that continuously prompts and informs the operator. • High resolution, accurate readings of concentration from low levels to 100%. Large, bright, meter readout.
Infrared Gas Analyzer Introduction 1 being measured. There is a direct correlation between absorption and the concentration of the component of interest in the liquid mixture. 1.5 NDIR Analyzer The Model 7300A contains an optical system consisting of an infrared (IR) source, sample cell, and detectors. In front of the thermopile detectors are four interference-type filters. These filters are designated the reference and measuring filters.
1 Introduction 1-4 Model 7300A Teledyne Analytical Instruments
Infrared Gas Analyzer Installation 2 2.0 Installation Installation of the Model 7300A Infrared Gas Analyzer includes: 1. Unpacking 2. Mounting 3. Gas connections 4. Electrical connections 5. Testing the system. 2.1 Unpacking the Analyzer/Inspection 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. 2.
2 Installation Model 7300A placed as close to the sample point as possible and bolted to its supporting surface. When installed as a system with enclosure (non-panel or rack mounted) a waterproof mastic should be liberally applied to the under surfaces of all supporting legs of the cubicle system before placing it in position and bolting it in place. 2.2.
Infrared Gas Analyzer Installation 2 2.2.4 Pipe Connections Refer to Appendix Piping Drawings for information about pipe connections. On special systems, consult the text in the manual that describes your particular sample system in detail. 2.2.5 Sample Delivery System The sample delivery system should be designed to operate reliably and must be of large enough capacity to avoid flow stops.
2 Installation Model 7300A 2.3.1 Primary Input Power The power cord receptacle and fuse block are located in the same assembly. Insert the power cord into the power cord receptacle. DANGER: POWER IS APPLIED TO THE INSTRUMENT'S CIRCUITRY AS LONG AS THE INSTRUMENT IS CONNECTED TO THE POWER SOURCE. THE STANDBY ON THE FRONT PANEL IS FOR SWITCHING POWER ON OR OFF TO THE DISPLAYS AND OUTPUTS ONLY. The standard power supply requires a 110 V ac, 50-60 Hz power source, or 220 V ac, 50-60 Hz power (optional). 2.3.
Infrared Gas Analyzer Installation 2 4–20 mA dc % Range: Current rises linearly with concentration, from 4 mA at 0 concentration to 20 mA at full scale. (Full scale = 100% of programmable range.) 4–20 mA dc Range ID: 8 mA = Range 1, 12 mA = Range 2, 16 mA = Range 3, 20 mA = Range 4.
2 Installation Model 7300A 6 7 8 9 10 0.6 0.7 0.8 0.9 1.0 13.6 15.2 16.8 18.4 20.0 To provide an indication of the range, the Range ID analog outputs are used. They generate a steady preset voltage (or current when using the current outputs) to represent a particular range. Table 2-4 gives the range ID output for each analysis range. Table 2-4: Analog Range ID Output—Example Range Range 1 Voltage (V) 0.25 Range 2 0.50 12 95-100% CO/N2 Range 3 0.75 16 0-100% CO/N2 Range 4 (Cal) 1.
Infrared Gas Analyzer Installation 2 System Alarm: Actuates when DC power supplied to circuits is unacceptable in one or more parameters. Permanently configured as failsafe and latching. Cannot be defeated. Actuates if self test fails. (Reset by pressing button to remove power. Then press again and any other button EXCEPT System to resume. Further detail can be found in chapter 4, section 4-5.
2 Installation Model 7300A Table 2-6: Remote Calibration Connections Pin 9 11 10 12 40 41 Function + Remote Zero – Remote Zero + Remote Span – Remote Span Cal Contact Cal Contact Remote Calibration Protocol: To properly time the Digital Remote Cal Inputs to the Model 7300A Analyzer, the customer's controller must monitor the Cal Relay Contact. When the contact is OPEN, the analyzer is analyzing, the Remote Cal Inputs are being polled, and a zero or span command can be sent.
Infrared Gas Analyzer Installation 2 2.3.3.4 Range ID Relays Four dedicated Range ID relay contacts. For any single application they are assigned to relays in ascending order. For example: if all ranges have the same application, then the lowest range is assigned to the Range 1 ID relay, and the highest range is assigned to the Range 3 ID relay. Range 4 is the Cal Range ID relay. Table 2-7 lists the pin connections. Table 2-7: Range ID Relay Connections Pin 21 38 22 39 19 18 34 35 2.3.3.
2 Installation Model 7300A 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.
Infrared Gas Analyzer Installation 2 Table 2-8: Commands via RS-232 Input Command Description as Immediately starts an autospan. az Immediately starts an autozero. rp Allows reprogramming of two System functions: APPLICATION (gas use) and ALGORITHM (linearization). st Toggling input. Stops/Starts any status message output from the RS-232, until st is sent again. Implementation: The RS-232 protocol allows some flexibility in its implementation.
2 Installation 2.5 Model 7300A Testing the System Before plugging the instrument into the power source: • Check the integrity and accuracy of the fluid 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 controlled accuracately and is maintained between 5 to 10 psig, according to the requirements of your process.
Infrared Gas Analyzer Installation 2 1. Introduce zero fluid and set zero as referred in section 4.4.1 NOTE: When calibrating from 0% to an upper concentration gas, obtain a zero gas (minus the analyte) that typically is as pure as the minimum resolution needed to control to. This usually meets or exceeds the minimum full scale accuracy of the measurement. 2. Introduce a span fluid and set the concentration of the span fluid. Refer to the span procedure in section 4.4.2.
2 Installation 2-14 Model 7300A Teledyne Analytical Instruments
Infrared Gas Analyzer Start-up and Operation 3.0 Start-up and Operation 3.1 Preliminary Before applying power to the system, TAI suggests that the electrical wiring installation be checked against the system input-output diagram. Proper attention to this preliminary check will prevent severe damage caused by wiring errors. Also, verify that all connections to the system have been made correctly. Refer to the system outline diagram for proper connections. 3.
3 Start-up and Theory of Operation Model 7300A and sample flow between 0.1 to 0.6 SCFH (50-250 cc/min) . Zero standard gas must have a composition similar to sample, an ideally, contains none of the components of interest. Initialize a zero operation through the system menu. Refer to Section 4 for Electronics /Control Unit Modes and Functioning to navigate the zero menu. After the zero cycle is over, the instrument is not yet calibrated.
Infrared Gas Analyzer Start-up and Operation are not used during automatic sampling. 3.3 Theory of operation 3.3.1 General The non-dispersive infrared (NDIR) analyzer is one of the major components of the system. It employs the basic principles of spectroscopic analysis to measure a specific concentration of one gas in a multicomponent gas system.
3 Start-up and Theory of Operation Model 7300A These lamps are typically rated for 20,000 hours continuous operation when run in the DC mode (+5VDC). This collimated energy is directed through parallel infrared beams. The radiant energy passes through tubes containing a continuously flowing sample gas. As the beam passes through the reference tube, the energy of the beam is unattenuated and balanced which provides a standard of source energy output for comparison.
Infrared Gas Analyzer Start-up and Operation 3.4 Circuit Description The Teledyne Analytical Instruments IR bench is a multiple wavelength, single beam design. It uses a quadruple detector that consists of a specially designed, patented thermopile with small IR filters mounted in front of it to produce independent voltages. These correspond to the transmission of energy at each filter’s wavelength. They are amplified by special high stability operational amplifiers to produce the output of the device.
3 Start-up and Theory of Operation 3.5 Model 7300A Digital Signal Processing & Electronics The Model 7300A uses an 8031 microcontroller (Central Processing Unit—CPU) with 32 kB of RAM and 128 kB of ROM to control all signal processing, input/output, and display functions for the analyzer. System power is supplied from a universal power supply module designed (C65507) to be compatible with any international power source.
Infrared Gas Analyzer Start-up and Operation The CPU also provides appropriate control signals to the Displays, Alarms, and External Valve Controls, and accepts digital inputs for external Remote Zero and Remote Span commands. It monitors the power supply through an analog to digital converter as part of the data for the system failure alarm it performs timing and linearizing tasks too. The RS-232 port provides two-way serial digital communications to and from the CPU.
3 Start-up and Theory of Operation Model 7300A Figure I Linearizer Output Gas Concentration NDIR Bench Output Figure II Linearizer Input Piece-wise approximation is the method used to linearize the signal, i.e.
Infrared Gas Analyzer 3.7 Start-up and Operation AUTOMATIC FUNCTION (Optional) The events talking place during a zero cycle are as follows: l. The zero cycle starts with activation of the calibration contact. The analyzer outputs are held during the zero cycle. 2. The Auto Zero solenoid valve (optional) is activated and zero gas replaces the sample. (This valve may be internal or external to the Model 7300A enclosure). 3. At about minute one in the cycle.
3 Start-up and Theory of Operation 3-10 Teledyne Analytical Instruments Model 7300A
Infrared Gas Analyzer Operation 4 Operation 4.1 Introduction Although the Model 7300A 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 4.2 Model 7300A Using the Controls To get the proper response from these controls, press the desired key (ESCAPE or ENTER—DOWN or UP). To enter the screen menu, press any key. The item that is between arrows on the screen is the item that is currently selectable by pressing the ENTER enter key. In these instructions, to ENTER means to press the ENTER KEY, and to ESCAPE means to press the ESCAPE KEY.
Infrared Gas Analyzer Operation 4 SETUP MODE Span/Zero Off/On Span/Zero Timing PSWD Enter Password Change Yes/No LOGOUT Secure Sys & Analyze Only MODEL Show Model and Version SELF-TEST Self-Test in Progress AUTO-CAL Auto/Manual Span Select Span Value Set ZERO Auto/Manual Zero Select Zero in Progress ALARMS Select Range Gas Use Range RANGE Yes Change Password Verify Password Slef-Test Results SPAN Man Span/Zero Off/On Select Range Span in Progress % / ppm Select Setpoints & A
4 Operation Model 7300A 4.2.1.2 Setup Mode The MAIN MENU consists of 14 functions you can use to customize and check the operation of the analyzer. Figure 4-1 shows the functions available with the 7300A. They are listed here with brief descriptions: 1 AUTO-CAL: Used to define and/or start an automatic calibration sequence. 2 PSWD: Used to establish password protection or change the existing password. 3 LOGOUT: Logging out prevents unauthorized tampering with the analyzer settings.
Infrared Gas Analyzer Operation 4 15 OFFSET: This function helps set a non-zero offset to the zero calibration. It is useful when zeroing the analyzer with a background gas that is different than the sample. 16 CAL-INDEPD: Not generally accessed buy the end user. Forces analyzer to be in independent calibration mode. 17 STANDBY: Remove power to outputs and displays, but maintain power to internal circuitry. Any function can be selected at any time.
4 Operation Model 7300A If you do not wish to continue a function, you can abort the session by escaping . Escaping a function takes the analyzer back to the previous screen, or to the ANALYZE Function, depending on the function escaped. reproduced, at the appropriate point in the procedure, in a Monospaced type style. Push-button names are printed in Oblique type. 4.3.
Infrared Gas Analyzer Operation 4 4.3.3 Password Protection Before a unique password is assigned, the system assigns TAI by default. This password will be displayed automatically. The operator just presses the Enter key to be allowed total access to the instrument’s features. If a password is assigned, then setting the following system parameters can be done only after the password is entered: alarm setpoints, AUTO-CAL setup.
4 Operation Model 7300A Press Escape to move on, or proceed as in Changing the Password, below. 4.3.3.2 Installing or Changing the Password If you want to install a password, or change an existing password, proceed as above in Entering the Password. When you are given the opportunity to change the password: Change Password? =Yes =No Enter to change the password (either the default TAI or the previously assigned password), or press Escape to keep the existing password and move on.
Infrared Gas Analyzer Operation 4 When you have finished typing the new password, press Enter. A verification screen appears. The screen will prompt you to retype your password for verification. Enter PWD To Verify: A A A Use the UP/DOWN key to retype your password and use ENTER to scroll through the letters, and last enter will complete verification.
4 Operation Model 7300A 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. To initiate a self diagnostic test during operation, use the UP/DOWN key to scroll through the MAIN MENU to the SELFTEST and Enter. The screen will follow the running of the diagnostic. RUNNING DIAGNOSTIC Testing Preamp Cell When the testing is complete, the results are displayed.
Infrared Gas Analyzer Operation 4 Dpt Ø INPUT Ø.ØØ OUTPUT Ø.ØØ The leftmost digit (under Dpt) is the number of the data point being monitored. Use the UP/DOWN key to select the successive points. The INPUT value is the input to the linearizer. It is the simulated output of the analyzer. You do not need to actually flow gas. The OUTPUT value is the output of the linearizer. It should be the ACTUAL concentration of the span gas being simulated.
4 Operation Model 7300A Hard_offset_C=3015 (This is the raw DAC count of the Coarse zero adjustment. It should read between 0 and 4095) Hard_offset_F=2715 (This is the raw DAC count of the Fine zero adjustment. It should read between 0 and 4095) Current_gain = 4 (This is the gain the analyzer is on, it should read between 0 and 9) 4.3.9 Digital Filter Setup The 7300A analyzer has the option of decreasing or increasing the amount of filtering on the signal.
Infrared Gas Analyzer 6 7 8 9 10 Operation 4 160 320 640 1280 2360 The response time listed above can and will change depending on the application and they merely serve to illustrate the effect of the digital filter. The digital filter disengages if there is an upset that is more than 5% of full scale. As the reading comes within the range, the filter becomes active once again. 4.3.
4 Operation Model 7300A How the offset value is selected: To find out what the offset value should be, the intended zero calibration gas and the mix of the process background gas must be procured. This of course assumes that the zero gas and the process background gas are very different and that an offset will occur. 1.
Infrared Gas Analyzer Operation 4 Adjst output to 4ma to OK: -7 Use the Up or Down key to adjust the number on the VFD display. The range of this number is from –255 to 255. As this number changes, so should the reading of the ammeter. Adjust this number until the reading of the ammeter is, as close as possible, 4.00 madc.
4 Operation 4.4 Model 7300A The Zero and Span Functions (1) The Model 7300A can have as many as three analysis ranges plus a special calibration range (Cal Range); and the analysis ranges, if more than one, may be programmed for separate or identical gas applications. (2) If all ranges are for the same application, then you will not need the Cal Range. Calibrating any one of the ranges will automatically calibrate the others.
Infrared Gas Analyzer Operation 4 If you want to calibrate ALL of the ranges at once (multiple application analyzers only), use auto mode zeroing in the Cal Range. Make sure the zero gas is flowing to the instrument. If you get a CELL CANNOT BE BALANCED message while zeroing skip to section 4.4.1.3. 4.4.1.1 Auto Mode Zeroing Observe the precautions in sections 4.4 and 4.4.1, above.Scroll to ZERO function buy using UP/DOWN control and enter the zero function mode.
4 Operation Model 7300A 4.4.1.2 Manual Mode Zeroing Scroll to Zero and enter the Zero function. The screen that appears allows you to select between automatic or manual zero calibration. Use the UP/DOWN keys to toggle between AUTO and MAN zero settling. Stop when MANUAL appears, blinking, on the display. Select zero mode: MANUAL Enter to begin the zero calibration. After a few seconds the first of three zeroing screens appears. The number in the upper left hand corner is the firststage zero offset.
Infrared Gas Analyzer Operation 4 b. Check for leaks downstream from the sensor, where contamination may be leaking into the system. c. Check flowmeter to ensure that the flow is no more than 200SCCM d. Check temperature controller board. e. Check gas temperature. If none of the above as indicated, the sensor may need to be replaced. Check warranty, and contact Analytical Instruments Customer Service. 4.4.2 Span Cal The Span button on the front panel is used to span calibrate the analyzer.
4 Operation Model 7300A ENTER will move the blinking field to units (%/ppm). Use UP/DOWN key to select the units, as necessary. When you have set the concentration of the span gas you are using, Enter to begin the Span calibration. ####.##% Slope=#.### CO2 Span 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.
Infrared Gas Analyzer Operation 4 is pressed, the Span reading changes to the correct value. The instrument then automatically enters the Analyze function. 4.5 The Alarms Function The Model 7300A is equipped with 6 fully adjustable set points concentration with two alarms and a system failure alarm relay. Each alarm relay has a set of form “C" contacts rated for 3 amperes resistive load at 250 V ac.
4 Operation Model 7300A 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. (See procedures, below.) If you are using password protection, you will need to enter your password to access the alarm functions.
Infrared Gas Analyzer • • • Operation 4 the number. Holding down the key speeds up the incrementing or decrementing. After the number (value) has been choosed, use Enter to move the desired parameter. Then use the UP/DOWN keys to change the parameter. Once the parameters for alarm have been set, Enter the alarm function again, and repeat this procedure for next alarm. To reset a latched alarm, go to Dft and then use either UP two times or DOWN two times. (Toggle it to Y and then back to N.
4 Operation Model 7300A Note: If all three ranges are currently defined for different application gases, then the above screen does not display (because mode must be manual). Instead, the VFD goes directly to the following screen. If above screen displays, use the UP/DOWN arrow keys to Select MANUAL, and press Enter. Select range to run > Ø1 Ø2 Ø3 CAL< Use the UP/DOWN keys to select the range: 01, 02, 03, or CAL. Then press Enter.
Infrared Gas Analyzer Operation 4 range readings are accurate UNLESS the application uses linearization over the selected range. The concentration ranges can be redefined using the Range function Manual screen, and the application gases can be redefined using the APPLICATION function, if they are not already defined as necessary. CAUTION: Redefining applications or ranges might require relinearization and/or recalibration.
4 Operation Model 7300A • • Ranges that overlap Ranges whose limits are entirely within the span of an adjoining range. Figure 4-2 illustrates these schemes graphically. Figure 4-2: Examples of Autoranging Schemes 4.7 The Analyze Function Normally, all of the functions automatically switch back to the Analyze function when they have completed their assigned operations. Pressing the Escape button in many cases also switches the analyzer back to the Analyze function.
Infrared Gas Analyzer Operation 4 If the concentration detected is over range, 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. These functions should only be reprogrammed by trained, qualified personnel. To program, you must: 1. Enter the password, if you are using the analyzer’s password protection capability. 2.
4 Operation Model 7300A In the autoranging mode, the microprocessor automatically responds to concentration changes by switching ranges for optimum readout sensitivity. If the upper limit of the operating range is reached, the instrument automatically shifts to the next higher range. If the concentration falls to below 85% of full scale of the next lower range, the instrument switches to the lower range. A corresponding shift in the DC concentration output, and in the range ID outputs, will be noticed.
Infrared Gas Analyzer Operation 4 Note: The ranges must be increasing from low to high, for example, if Range 1 is set to 0–10 % and Range 2 is set to 0–100 %, then Range 3 cannot be set to 0–50 % since that makes Range 3 lower than Range 2. Ranges, alarms, and spans are always set in either percent or ppm units, as selected by the operator, even though all concentration-data outputs change from ppm to percent when the concentration is above 9999 ppm.
4 Operation Model 7300A Algorithm setup: VERIFY SETUP UP/DOWN to select and Enter VERIFY to check whether the linearization has been accomplished satisfactorily. Dpt Ø INPUT Ø.ØØ OUTPUT Ø.ØØ The leftmost digit (under Dpt) is the number of the data point being monitored. Use the UP/DOWN keys to select the successive points. The INPUT value is the input to the linearizer. It is the simulated output of the analyzer. You do not need to actually flow gas. The OUTPUT value is the output of the linearizer.
Infrared Gas Analyzer Operation 4 From the MAIN MENU Screen— 1. Use UP/DOWN to select ALGORITHM , and Enter. 2. Select and Enter SETUP. 3. Select MANUAL from the Calibration Mode Select screen. Dpt 1 INPUT Ø.ØØ OUTPUT Ø.ØØ The data entry screen resembles the verify screen, but the gas values can be modified and the data-point number cannot. Use the UP/DOWN key to set the INPUT value for the lowest concentration into the first point. ENTER to move to OUTPUT field.
4 Operation Model 7300A Note: The span gas use to span the analyzer must be >90% of the range being analyzed. Before starting linearization, perform a standard calibration. See section 4.4. To enter data: From the MAIN MENU screen— 1. Use UP/DOWN to select ALGORITHM , and Enter. 2. Select and Enter SETUP. 3. Enter AUTO from the Calibration Mode Select screen. The Auto Linearize Mode data entry screen appears. 1.95 % CO2 Input(Ø) :2.00 5.
Infrared Gas Analyzer Operation 4 tivity of the binary gas, the analyzer would normally be set up so that the 100% oxygen (0% argon) concentration would correspond to the zero level (4mA 0 V) of the output signal. Then, 85% oxygen (15% argon) would correspond to 20mA (1 V) in the signal output. It may be convenient for the user to have the outputs reversed so that the 85-100% oxygen level outputs a 4-20mA (0-1 V) signal respectively.
4 Operation Model 7300A Select STANDBY to restart the system. 4.9.3 Gain Preset NOTE: This function will apply only for the analizer that has multiple range and non-linearity. For nonlinear application, the signal produced by the infrared detector, will not correspond to the actual gas concentration. The amplification of each range will not agree, therefore, the gain must be preset in order for the signal to read linearly. To set the gain, the following must be performed in sequence.
Infrared Gas Analyzer Maintenance 5 5.0 Maintenance Aside from normal cleaning and checking for leaks at the gas connections, routine maintenance is limited to replacing filter elements and fuses, and recalibration. WARNING: SEE WARNINGS ON THE TITLE PAGE OF THIS MANUAL. 5.0 Replacing the Fuse Remove Power to Unit before replacing the fuse. 1. Place small screwdriver in notch, and pry cover off, as shown in Figure 5-1. Figure 5-1: Removing Fuse Block from Housing 2.
5 Maintenance Model 7300A 4. Reassemble Housing as shown in Figure 5-1. American Fuses European Fuses Figure 5-2: Installing Fuses 5.1 Routine Maintenance The 7300A should be inspected on a regular schedule to be determined by the maintenance personnel. The system filter and analyzer measurement cell should be maintained as required by the quality of the sample. Periodic calibration of the system will assure accurate analysis of the sample gas and will also indicate the need for maintenance.
Infrared Gas Analyzer Maintenance 5 5.3 NDIR Analyzer Measurement Cell The Infrared Analyzer contains an auto zero circuit which automatically zeroes the analyzer. This zeroing compensates for dirt in the sample cell and, under normal circumstances, will compensate for very large amounts of contamination in the cell. If there is a need for removing the cell and cleaning it, follow this procedure: A) Turn off power to the analyzer and open the optical bench housing.
5 Maintenance Model 7300A Table 5-1: Self Test Failure Codes Power 0 1 2 3 OK 5 V Failure 15 V Failures 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 >0 OK Amplifier failure high offset (number is a code that pinpoint which gains are at fault). Detector 5.5 0 OK 1 Failed (open filament, short to ground, no power.
Infrared Gas Analyzer Maintenance 5 Figure 5-3: Cell Assembly WARNING: HAZARDOUS VOLTAGES EXIST ON CERTAIN COMPONENTS INTERNALLY WHICH MAY PERSIST FOR A TIME EVEN AFTER THE POWER IS TURNED OFF AND DISCONNECTED.
5 Maintenance Model 7300A 5.6 Troubleshooting 5.7 General This section contains information on the assembly and the electronic sections of the Model 7300A Infrared Analyzer. The sample-handling sections of the system are statistically low failure items and only require the maintenance as pertinent to sample system operation (plugging, flowrates, leaks, etc.).
Infrared Gas Analyzer Maintenance 5 5.8 TROUBLE SHOOTING CHART SYMPTOM A. Unit does not turn ON when actuating Power Switch (Motor does not turn). CORRECTIVE ACTION (a) Check AC voltage at inlet for correct voltage. Reset breaker or switch to supply power to receptacle. (b) Check power to terminal strip located inside cabinet. CAUTION: Terminal strip contains 90-220volt line voltage which can be hazardous. Check for loose connection to one of the terminal board lugs; replace as required. B.
5 Maintenance C. Meter reads Negative (with zero gas flowing through analyzer) Model 7300A (a) ZERO control may be misadjusted. Adjust control to bring indication up to zero. (refer to Section 4). (b) If zero indication unattainable with ZERO control centered, monitor TP6 on preamp board. (c) Check that infrared source is operating. If no light check source element resistance and connections. D. Meter Up Scale or Overscale (a) Redo full calibarion. (b) Check for obstruction in sample beam path.
Infrared Gas Analyzer Maintenance 5 (b) Chopper hitting housing. (c) Noisy detector. (d) AC pickup at printed circuit board. (e) Optical unit not grounded to cabinet. (f) Detector connections loose. (g) Faulty preamplifier board. (h) Contamination in cell.
5 Maintenance 5-10 Model 7300A Teledyne Analytical Instruments
Infrared Gas Analyzer Appendix Appendix A-1 Specifications 7300A Digital Control Portion: Ranges: Three Programmable Ranges, field selectable within limits (application dependent) and Auto Ranging Display: 2 line by 20 alphanumeric VFD accompanied by 5 digit LED display Signal Output: 4-20mADC iso or 0-1 VDC negative ground Alarm: Dual Alarm Relay Mounting: General Purpose Operating Temperature: 5-45oC (41-113oF) Sample Temperature: 5-45oC (41-113oF) Accuracy: ±2% of full scale at constant temperature L
Appendix Model 7300A 7300 Specifications Chemical and petrochemical processes • Combustion and flue gas processes • Pulp and paper • Vapor recovery systems • Enhanced oil recovery Gas Analysis CO2 0-2% to 0-100% CO 0-10% to 0-100% CH4 0-10% to 0-100% C2 to C5 0-5% to 0-100% Food, agriculture, medical • Metals, ceramics and heat treating atmospheres Liquid Analysis Aromatics 0-5% up to 0-100% MTBE, ETBE, TAME 0-20% Methanol, Ethanol 0-15% Isobutanes 0-75% Benzene 0-5% • Landfill gas power stations • Em
Infrared Gas Analyzer Appendix Recommended 2-Year Spare Parts List NOTE: Part list may or not be part of your system, due to the wide range of applications implicated.
Appendix Model 7300A ATTACHMENT 7300A Quote "Exceptions" and "GAS PHASE Conditions" for this application: 1 2 3 4 5 6 7 8 9 A-4 Response Time is proportional to sample system design for take-off distance, process pressure, line size, by-pass flow design, deadvolumes/tee's, sample cell volume and instrument electronics. We assume no particulates that could plug the lines or contaminate the optical components. Control the pressure in the measuring sample cell to within 0.
Infrared Gas Analyzer Appendix 10 If condensables occur, such as moisture, acid gases, solvents, etc., sample system materials may be compromised for corrosion resistance integrity. Special materials may be required. 11 Teledyne is not responsible for applying a general purpose instrument in a hazardous area or where a flammable gas is brought to an analyzer above its lower explosive limit and the area has been classified as general purpose.