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Panametrics CGA 351 User Manual

Zirconium oxide oxygen analyzer
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CGA 351
Zirconium Oxide Oxygen Analyzer
User's Manual
910-199 Rev. D
panametrics.com
Aug 2021

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Summary of Contents for Panametrics CGA 351

  • Page 1 Flow CGA 351 Zirconium Oxide Oxygen Analyzer User’s Manual 910-199 Rev. D panametrics.com Aug 2021...
  • Page 3 AUTHORIZATION number (RA), and shipping instructions for the return of the instrument to a service center will be provided. 2. If Panametrics instructs you to send your instrument to a service center, it must be shipped prepaid to the authorized repair station indicated in the shipping instructions.
  • Page 4 Warranty [no content intended for this page] CGA 351 User’s Manual...

  • Page 5: Table Of Contents

    4.1.14 Calibrating the CGA 351 ........
  • Page 6 A.1.3 The CGA 351 Nernst Equation........

  • Page 7: General Information

    1.1.1 Introduction The CGA 351 monitors the oxygen content of any clean and dry gas stream. The analyzer can accurately measure oxygen levels from 0.1 ppm to 100% O , and can even measure oxygen content in reducing gases. This is accomplished with a precision, temperature-controlled, zirconium oxide (zirconia) oxygen sensor.
  • Page 8 400 ± 40 cc/min. • Furnace Bracket Sensor Furnace Flowmeter Flowmeter Oxygen Sensor Manifold Thermocouple Needle Valve Electrical Conduit Figure 2: Sensor Enclosure CGA 351 User’s Manual...

  • Page 9: The Sample System

    The Sample System In addition to the components supplied with the CGA 351, an external sample system may be required to ensure that the analyzer is fed a properly conditioned sample or calibration gas stream. In particular, the gas must be clean and dry, and it must be delivered to the analyzer at atmospheric pressure.
  • Page 10 A platinum coating on the end of the ceramic tube and the zirconium oxide oxygen sensor ensures that all oxidation/reduction reactions in the sample gas reach equilibrium. It is therefore possible to measure such parameters as excess oxygen in air/fuel mixtures and equilibrium oxygen in reducing atmospheres such as hydrogen. CGA 351 User’s Manual...

  • Page 11: The Zirconium Oxide Oxygen Sensor

    The Heater Control Circuit The oxygen sensor temperature in the CGA 351 is maintained by a heater, which is part of a complex temperature control loop. This circuit constantly monitors the temperature input from an RTD, compares it to the set point temperature, and turns the heater ON or OFF accordingly.
  • Page 12 PID loop is a very complex matter. As a result, randomly changing the P, and/or I parameters can seriously degrade the performance of the CGA 351. IMPORTANT: Always contact the factory before attempting to change the default P and/or I values. The submenu for performing these changes is password protected to prevent accidental changes.

  • Page 13: Installation

    Installation 2.1.1 Introduction This chapter provides a general description of the standard CGA 351 and gives directions on how to install and wire the analyzer for proper operation. Note: For information regarding component locations and/or wiring connections in an optional enclosure, see Appendix C.

  • Page 14: Choosing An Installation Site

    All environmental and installation factors should have been discussed with a Panametrics Sensing applications engineer or field sales person at the time the CGA 351 was ordered. Thus, the equipment should be suited to the application and the planned installation site. Before installing the unit, however, read the following guidelines to verify that the best installation site has been chosen for optimum instrument accuracy and reliability.

  • Page 15: Mounting The Cga 351

    The sample system should be located so that it is able to deliver a sample at a flow rate of 400 ±40 cc/min. For best results, mount the sample system as close as possible to the CGA 351. An ideal location would be on the same panel, just below the analyzer.

  • Page 16: Wiring The Analyzer

    1.8 m (6 ft) of the unit. WARNING! To ensure safe operation of the CGA 351, the unit must be installed and operated as described in this manual. Also, be sure to follow all applicable local safety codes and regulations for installing electrical equipment.
  • Page 17 Connect the ground wire (white - #G) and any shields to either of the pins labeled G. This completes the wiring of terminal block TB2. Proceed to the next section to continue wiring the CGA 351. CGA 351 User’s Manual...
  • Page 18 Chapter 2. 2.1.5.3 Wiring the Line Power (TB3) Terminal block TB3 contains connections for the line power to the CGA 351. To wire the line power, complete the following steps: WARNING! Before proceeding with the section, verify that the line power has been turned off at the external disconnect device.
  • Page 19 6 3/4 (171) 14 1/4 (362) 11 1/2 9 1/2 (406) (292) (241) 3 1/2 (89) 6 3/8 (162) Ø1/2 (Ø12.7) 4pl Mounting Mounting Hole Plate (406) SIDE VIEW Note: Dimensions are in inches (millimeters). FRONT VIEW CGA 351 User’s Manual...
  • Page 20 FUSE Normally Open (Standard Mode) ALARM 1 Common FUSE Normally Closed (Failsafe Mode) Rating: Normally Open (Standard Mode) Type: Anti-Surge ALARM 2 Common 5 x 20 mm Size: Normally Closed (Failsafe Mode) Inputs Conduit Outputs/Power Conduit CGA 351 User’s Manual...

  • Page 21: Operation

    • taking measurements WARNING! To ensure safe operation of the CGA 351, it must be installed and operated as described in this manual. In addition, be sure to follow all applicable local safety codes and regulations for installing electrical equipment.

  • Page 22: User Program Security

    3.1.4 User Program Security The CGA 351 has been equipped with a User Program that permits the setup and calibration of the instrument for optimum performance in any specific application. However, to prevent accidental changes to critical system parameters, four levels of security are imposed on the various submenus within the User Program . These are: •...
  • Page 23 IMPORTANT: In some applications, portions of the User Program may be locked to prevent end user access. If this is the case, entrance to these submenus requires a special key sequence and a password (see page 16). CGA 351 User’s Manual...
  • Page 24 If either of the Temperature inputs is selected for display, °C and °F are available as the unit types. For the Sensor and Duty Cycle inputs, mV and pcnt, respectively, are the only available unit types. CGA 351 User’s Manual...
  • Page 25 Notice that the newly configured display shows the slot number and the input parameter on the top line, and the current live value along with the unit type are displayed in the center of the screen. Note: See “The [Opt-User] Menu” on page 46 for instructions on how to adjust the display contrast. CGA 351 User’s Manual...
  • Page 26 ARng value calculated above, AR-A = 0 and AR-B = 1, as shown in the table. After programming the Auto Ranges, the CGA 351 must be configured to properly handle the Auto Range output. To accomplish this, the following outputs must be reprogrammed: •...
  • Page 27 Use the [  ARng and [ ] keys to select the  AR-A AR-A option and press [ENTER]. AR-B POWER ENTER Note: The [ppm], [pcnt] and [AF] options are also available above. CGA 351 User’s Manual...
  • Page 28 User Program . Enter the User Program by pressing the [ESC] key. Table 17: Disp Notice that the fourth option, [Disp], is now available. Use the [] and [] keys to select [Disp] and press [ENTER]. POWER ENTER CGA 351 User’s Manual...
  • Page 29 POWER ENTER Although the meter is still collecting data, the digital display does not know which information to show. Simply re-select the appropriate input parameter, through the [Disp] menu option, to restore the digital display. CGA 351 User’s Manual...

  • Page 30: Converting Mv To Oxygen Concentration

    Therefore, it may sometimes be helpful to manually convert a reading from one form to another. Table 21 below provides such information for the full range of the CGA 351, at the typical operating temperature of 700°C.
  • Page 31 1: Cal Heater Security Level Key Sequence Password? Disp pcnt Unlocked Impedance Operator - Locked ESC, ENT, ESC Diag General - Locked ESC, ENT, ESC [*as selected in 1: Cfg menu] Factory - Locked ESC, ENT, ESC CGA 351 User’s Manual...
  • Page 32 CGA 351 User’s Manual...

  • Page 33: Setup And Calibration

    POWER ENTER As an aid in programming the CGA 351, refer to the menu map, Figure 3-1 on page 25. Proceed directly to the appropriate section to set up and/or calibrate the analyzer. 4.1.3 The [Cal] Menu After entering the User Program , access the [Cal] submenu to set the following parameters: •...

  • Page 34: Setting Up The Alarm Relays

    Chapter 4. 4.1.4 Setting Up the Alarm Relays To set up the CGA 351’s external alarm relays, corresponding to the wiring terminals on TB1, proceed as follows: Table 23: Disp Use the [] and [] keys to select [2: Cal] and press 1: Cal [ENTER].
  • Page 35 The meter now automatically returns to the “Alarm-Features” prompt. Either press [ESC] until you exit the User Program or proceed to the appropriate section to continue setting up the alarms. 4.1.4.2 Setting the Trip Value Enter the alarm setup menu (see page 28) and proceed as follows: CGA 351 User’s Manual...
  • Page 36 When done, press [ENTER]. POWER ENTER The meter now automatically returns to the “Alarm-Features” prompt. Either press [ESC] until you exit the User Program or proceed to the appropriate section to continue setting up the alarms. CGA 351 User’s Manual...
  • Page 37 When done, press [ENTER]. POWER ENTER The meter now automatically returns to the “Alarm-Features” prompt. Either press [ESC] until you exit the User Program or proceed to the appropriate section to continue setting up the alarms. CGA 351 User’s Manual...
  • Page 38 Press [ENTER] when done. Trip Reset POWER ENTER The meter now automatically returns to the “Alarm-Features” prompt. Either press [ESC] until you exit the User Program or proceed to the appropriate section to continue setting up the alarms. CGA 351 User’s Manual...
  • Page 39 Use the [] and [] keys to select the desired operating Non Fail-Safe mode and press [ENTER]. Fail-Safe POWER ENTER The meter now automatically returns to the “Alarm-Features” prompt. Press [ESC] until you exit the User Program . CGA 351 User’s Manual...

  • Page 40: Setting The Temperature Controls

    Chapter 4. 4.1.5 Setting the Temperature Controls To configure the temperature control circuits of the CGA 351, complete the following instructions. CAUTION! Improper temperature controls settings can seriously degrade the performance of the instrument. Never change these settings without specific instructions from the factory.
  • Page 41 [Yes] and press [ENTER]. POWER ENTER The meter now automatically returns to the “Temp. Control” prompt. Either press [ESC] until you exit the User Program or proceed to the appropriate section to continue setting up the temperature control. CGA 351 User’s Manual...
  • Page 42 [Yes] and press [ENTER]. POWER ENTER The meter now automatically returns to the “Temp. Control” prompt. Either press [ESC] until you exit the User Program or proceed to the appropriate section to continue setting up the temperature control. CGA 351 User’s Manual...
  • Page 43 [Yes] and press [ENTER]. POWER ENTER The meter now automatically returns to the “Temp. Control” prompt. Either press [ESC] until you exit the User Program or proceed to the appropriate section to continue setting up the temperature control. CGA 351 User’s Manual...
  • Page 44 [ENTER]. POWER ENTER The meter now automatically returns to the “Temp. Control” prompt. Either press [ESC] until you exit the User Program or proceed to the appropriate section to continue setting up the temperature control. CGA 351 User’s Manual...
  • Page 45 [Yes] and press [ENTER]. POWER ENTER The meter now automatically returns to the “Temp. Control” prompt. Either press [ESC] until you exit the User Program or proceed to the appropriate section to continue setting up the temperature control. CGA 351 User’s Manual...
  • Page 46 [Yes] and press [ENTER]. POWER ENTER The meter now automatically returns to the “Temp. Control” prompt. Either press [ESC] until you exit the User Program or proceed to the appropriate section to continue setting up the temperature control. CGA 351 User’s Manual...
  • Page 47 34, and proceed as follows: IMPORTANT: Restoring the default values invalidates the existing calibration. It will be necessary to recalibrate the meter (see “Calibrating the CGA 351” on page 62) before reliable readings are obtained. CGA 351 User’s Manual...
  • Page 48 [] and [] keys to select Cancel [Yes] and press [ENTER]. POWER ENTER [ESC] until you exit the User Program . The meter now automatically returns to the “Temp. Control” prompt. Press CGA 351 User’s Manual...

  • Page 49: Auto Range Analog Output

    • units for each range (ppm or pcnt) • zero and span points for each range After the Auto Range feature has been programmed, the two CGA 351 Alarms will indicate the specific range that is currently active. 4.1.6.1 Factory Defaults For convenience, the CGA 351 is preprogrammed at the factory with Auto Range default values that are suitable for many applications.
  • Page 50 ENTER Note: If a number less than 1 is entered above, the setting will default to 1 Auto Range. If a number greater than 4 is entered above, the setting will default to 4 Auto Range. CGA 351 User’s Manual...
  • Page 51 When done, 1..4  press [ENTER]. POWER ENTER The above step will be repeated as many times as necessary to complete the table for the total number of ranges selected on page 44. CGA 351 User’s Manual...

  • Page 52: The [Opt-User] Menu

    Table 73: User Use the [] and [] keys to select [Fault Alarm] and Fault Alarm press [ENTER]. Analog Output Contrast POWER ENTER Note: The [Backlight] and [Comm] options are also available in the above list box. CGA 351 User’s Manual...

  • Page 53: Setting Up The Analog Output

    4.1.9 Setting Up the Analog Output To set up the CGA 351’s analog output, enter the User Program (see page 27) and proceed as follows: Table 75: Disp Use the [] and [] keys to...
  • Page 54 Zero Trim: adjust the actual output to equal the low end of the analog output range. • Span Trim: adjust the actual output to equal the high end of the analog output range minus the zero setpoint. Proceed to the appropriate sub-section to program the desired analog output feature. CGA 351 User’s Manual...
  • Page 55 The 0-2V option is software-selected and therefore there is no need for hardware modifications to output 0-2 volts DC. The meter now automatically returns to the “Analog Output” prompt. Either press [ESC] until you exit the User Program or proceed to the appropriate section to continue setting up the analog output. CGA 351 User’s Manual...
  • Page 56 Press [ENTER] when done. POWER ENTER The meter now automatically returns to the “Analog Output” prompt. Either press [ESC] until you exit the User Program or proceed to the appropriate section to continue setting up the analog output. CGA 351 User’s Manual...
  • Page 57 Press [ENTER] when done. POWER ENTER The meter now automatically returns to the “Analog Output” prompt. Either press [ESC] until you exit the User Program or proceed to the appropriate section to continue setting up the analog output. CGA 351 User’s Manual...
  • Page 58 The meter now automatically returns to the “Analog Output” prompt. Either press [ESC] until you exit the User Program or proceed to the appropriate section to continue setting up the analog output. CGA 351 User’s Manual...
  • Page 59 Using the procedure under Testing the Analog Output on page 52, reset the Test Percent to its normal value. Either press [ESC] until you exit the User Program or proceed to the appropriate section to continue setting up the analog output. CGA 351 User’s Manual...
  • Page 60 Using the procedure under Testing the Analog Output on page 52, reset the Test Percent to its normal value. Either press [ESC] until you exit the User Program or proceed to the appropriate section to continue setting up the analog output. CGA 351 User’s Manual...

  • Page 61: Adjusting The Display Contrast

    [ESC] until you exit the User Program or proceed to the appropriate section of this chapter to continue programming the analyzer. 4.1.11 Setting the Display Backlight To set the LCD display backlight, enter the User Program , as described on page 27, and proceed as follows: CGA 351 User’s Manual...

  • Page 62: Setting Up The Serial Port

    This completes the adjusting of the display backlight. Either press [ESC] until you exit the User Program or continue programming. 4.1.12 Setting Up the Serial Port To set up the serial port, enter the User Program , as described on page 27, and proceed as follows: CGA 351 User’s Manual...
  • Page 63 When the desired rate is highlighted, press [ENTER]. 1200 2400 POWER ENTER 4.1.12.3 Entering the Number of Data Bits At the following prompt, enter the number of data bits in each data string. CGA 351 User’s Manual...
  • Page 64 Either press [ESC] until you exit the User Program or proceed to the appropriate section of this chapter to continue programming the meter. IMPORTANT: Check to make sure the communication parameters selected match the settings on the computer. CGA 351 User’s Manual...

  • Page 65: Setup And Security Settings

    Setup Use the [] and [] keys to select the desired action and Load Slot press [ENTER]. Load Main Erase Slot POWER ENTER Note: The [Erase Main] option is also available in the above list box. CGA 351 User’s Manual...
  • Page 66 This completes the setting up of the option card slot. To exit the User Program, disconnect and reconnect power to system. Follow the same procedure to add or remove additional option cards. CAUTION! Be careful when using Erase Slot or Erase Main to make sure the information is no longer needed. CGA 351 User’s Manual...
  • Page 67 After responding to any of the above options, the meter now automatically returns to the “Opt” prompt. This completes the setting of the option slots and the security levels. Either press [ESC] until you exit the User Program or proceed to the appropriate section of this chapter to continue programming the meter. CGA 351 User’s Manual...

  • Page 68: Calibrating The Cga 351

    Chapter 4. 4.1.14 Calibrating the CGA 351 To calibrate the CGA 351 analyzer, the following steps must be completed: • introduce the chosen calibration gas • regulate the calibration gas flow rate • adjust the calibration setting as required Proceed with the instructions in this section to calibrate the analyzer.
  • Page 69 Figure 3 on page 3 for an acceptable arrangement. Each CGA 351 is tagged with its optimum calibration gas flow rate, based on the testing performed during its factory calibration. Typically, this value will be 400 ± 40 cc/min.
  • Page 70 Adjusting the Calibration Setting After the calibration gas flow to the CGA 351 has been established, as described in the previous sections, the calibration gas setting may be adjusted as necessary. To adjust the heater setting, complete the following steps:...
  • Page 71 [] and [] keys to 000.00 increment the value. When done, press [ENTER]. POWER ENTER Table 121: PPM.. Invalid Output Use the [] and [] keys to select [Yes] and press Modifying value may [ENTER]. cause invalid output POWER ENTER CGA 351 User’s Manual...

  • Page 72: Checking The Current Settings

    The CGA 351 may now be placed back into service. 4.1.15 Checking the Current Settings To aid in monitoring the operation of the CGA 351, a built-in diagnostics routine is included in the User Program . To access this submenu, proceed as follows: CGA 351 User’s Manual...
  • Page 73 [] and [] keys to select [1: Cal] and press [ENTER]. 2: Cal POWER ENTER Table 129: Setup Diag Use the [] and [] keys to select [Diag] and press [ENTER]. Slct Cal Menu Item POWER ENTER CGA 351 User’s Manual...
  • Page 74 The four values shown above represent the current setpoint, proportional band, integration time, and maximum duty cycle. The meter now automatically returns to the “Diag” prompt. This completes the viewing of the heater settings. Press [ESC] until you exit the User Program . CGA 351 User’s Manual...

  • Page 75: Service And Maintenance

    • a faulty sensor furnace • missing sensor furnace voltage Use this section to troubleshoot any malfunction in the CGA 351. Refer to Figure 5 on page 87, and complete the following sections in the sequence indicated. Note: For information regarding component locations and/or wiring connections in an optional enclosure, see Appendix C.
  • Page 76 If an open loop (OL) is measured at the oxygen sensor clips, recheck the wiring and try again. If the OL reading repeats, contact the factory for assistance. Note: A cold sensor will always indicate an open loop (OL). CGA 351 User’s Manual...
  • Page 77 If a voltage reading other than those listed above is obtained, refer to Figure 4 and/or Table 5 on page 6 to determine the operating temperature of the sensor furnace. A standard CGA 351 operates at a temperature of 700°C.
  • Page 78 29.5841 19.8462 30.0002 21.9783 30.4153 24.1073 30.8296 24.5322 31.2429 24.9566 31.6553 25.3805 32.0668 25.8039 32.4773 26.2267 34.5150 26.6489 36.5278 27.0705 38.5154 27.4914 1000 40.4775 27.9115 1050 42.4131 28.3309 1100 44.3206 28.7494 1150 46.1973 29.1672 1200 48.0401 CGA 351 User’s Manual...
  • Page 79 Voltage Reading Recommended Action approximately Defective digital display unit - replace full line voltage the digital display (see page 84). There is no power reaching the sensor furnace - proceed with the next step. no voltage present CGA 351 User’s Manual...

  • Page 80: Oxygen Measurement Errors

    Refer to Figure 5 on page 87 for the location of the oxygen sensor clips, and check for a short circuit in the contact clip wiring (two wires touching). If this does not correct the problem, proceed to the next section. Note: For information regarding component locations and/or wiring connections in an optional enclosure, see Appendix C. CGA 351 User’s Manual...
  • Page 81 0.00 mV reading. A voltage reading of 0.00 mV should be obtained, to correspond with the 20.93% oxygen reading. If any voltage other than 0.00 mV is measured, the digital display is defective. Contact the factory for assistance. CGA 351 User’s Manual...
  • Page 82 This will give a reading that may be less than the expected amount of oxygen. To fix the problem, remove the source of the contamination. If the sample gas is not contaminated with hydrocarbons, recalibrate the oxygen sensor. See Calibrating the CGA 351 on page 62, for the correct procedure. 5.1.3.4 Oxygen Reading Too High This condition is most likely caused either by poor quality reference air, a leak in the plumbing or an oxygen sensor that is too cool.
  • Page 83 • The easiest way to check the sensor temperature is to calibrate the oxygen sensor as described in “Calibrating the CGA 351” on page 62. The calibration procedure includes instructions for adjusting the sensor furnace temperature, if necessary. If the problem has not been resolved by the steps in this section, contact the factory for assistance.

  • Page 84: Calibration Responses

    5.1.4 Calibration Responses Chapter 4, Setup and Calibration , describes the procedures for calibrating the CGA 351 in great detail. However, the response of the unit to the calibration procedures can provide valuable clues to potential problems with the installation. The three most common situations are described in this section.
  • Page 85 Reinstall both clips onto the oxygen sensor body. Close the cover on the sensor enclosure. Recalibrate the oxygen sensor as described in “Calibrating the CGA 351” on page 62. This completes the replacement of the oxygen sensor clips. CGA 351 User’s Manual...
  • Page 86 Connect the inlet and outlet process fittings to the bottom of the sensor enclosure. Close the cover on the sensor enclosure. Calibrate the new oxygen sensor as described in “Calibrating the CGA 351” on page 62. This completes the replacement of the oxygen sensor assembly.
  • Page 87 Close the covers on both enclosures. Energize the main power to the meter and calibrate the oxygen sensor (see “Calibrating the CGA 351” on page 62). This completes the replacement of the thermocouple.
  • Page 88 80 (starting with step 3). Close the cover on the sensor enclosure. Reconnect the main power to the unit and recalibrate the oxygen sensor (see Calibrating the CGA 351 on page 62). This completes the replacement of the sensor furnace.
  • Page 89 • controller card • option card(s) Proceed directly to the appropriate section to replace any of the above components. Note: For information regarding component locations and/or wiring connections in an optional enclosure, see Appendix C. CGA 351 User’s Manual...
  • Page 90 Reconnect the main power to the analyzer. Refer to Chapter 3, Operation , and Chapter 4, Setup and Calibration , to reprogram the new digital panel meter. The CGA 351 is now ready to be placed back into service. Replacing the Controller Card To replace a defective controller card, complete the following steps: CGA 351 User’s Manual...

  • Page 91: Recommended Spare Parts

    Reconnect the main power to the analyzer. Refer to Chapter 3, Operation , and Chapter 4, Setup and Calibration , to reprogram the new digital panel meter. The CGA 351 is now ready to be placed back into service. Replacing the Option Card...
  • Page 92 Chapter 5. Table 137: Spare Parts List - CGA 351 Part Number Description 703-1350 Basic I/O PCB 703-1361-01 Quad Alarm PCB (32K EPROM) 703-1376 CGA351 Sensor PCB 703-1362 CGA351 Interconnect PCB CGA 351 User’s Manual...
  • Page 93 Ceramic Block Manifold Sensor Furnace View A-A Sensor Furnace (bottom) Mounting Plate Inlet Fitting Thermocouple Sensor Upper Clip Sensor Lower Clip Mounting Screw Mounting Bracket 6 pl Inlet Fitting Mounting Screw Outlet Fitting Mounting Plate (bottom view) CGA 351 User’s Manual...
  • Page 94 CGA 351 User’s Manual...

  • Page 95: Specifications

    Background Gas Variation Effect: Sample gas must be clean, dry and free of combustibles. For best results, use the same background gas for calibration. Standard factory calibration is 5 ppm O in N Enclosures: NEMA 4X/IP66, stainless steel CGA 351 User’s Manual...

  • Page 96: Operating Specifications

    Warm Up Time : 30 minutes Calibration Gas : certified mixtures of 5 ppm O in N 6.1.3 Ordering Information The information below shows how the CGA 351 Analyzer Part Number is configured from the options specified. CGA351- CGA 351 User’s Manual...
  • Page 97 Voltage 3 = 220 VAC 4 = 240 VAC 1 = Standard Design on wall mount plate Package 2 = Rack Mount Inlet/Outlet 1 = 1/4 inch tube fitting Tube Fitting 2 = 6mm tube fitting CGA 351 User’s Manual...
  • Page 98 Chapter 6. [no content intended for this page] CGA 351 User’s Manual...

  • Page 99: The Nernst Equation

    A.1.1 Introduction The CGA 351 zirconium oxide oxygen analyzer uses the Nernst Equation to calculate the oxygen content of the sample gas. When a Yttrium-doped zirconium oxide ceramic is heated to a temperature above 650°C, it becomes an electrolytic conductor, as vacancies in the crystal lattice permit oxygen ions to diffuse into the ceramic.

  • Page 100: The Cga 351 Nernst Equation

    The CGA 351 Nernst Equation The Nernst Equation specifically applicable to the CGA 351 analyzer is obtained by substituting the above values into the general equation, converting the natural logarithm to the common logarithm (base 10) and converting the units for E to millivolts.
  • Page 101 100,000 ppm 10,000 ppm 1000 ppm 100 ppm 10 ppm 1 ppm Oxygen Concentration Figure A-4: Oxygen Sensor Output at 700°C The CGA 351 Nernst Equation (cont.) Table 138: ppm to mV Conversion at 700°C 305.122 229.995 215.757 290.591 229.421 215.463 282.090...
  • Page 102 210.325 239.388 219.997 210.098 238.496 219.638 209.874 237.640 219.286 209.652 236.817 218.939 209.432 236.026 218.598 209.215 235.264 218.263 209.000 234.528 217.933 208.787 233.817 217.608 10.0 208.576 233.130 217.288 232.464 216.972 231.819 216.662 231.193 216.356 230.586 216.054 CGA 351 User’s Manual...

  • Page 103: Ce Mark Compliance

    Appendix B. CE Mark Compliance B.1.1 Overview For CE Mark compliance, the CGA 351 zirconium oxide oxygen analyzer must meet both the EMC and LVD directives. IMPORTANT: CE Mark compliance is required only for units used in EEC countries. B.1.2 EMC Compliance For EMC compliance, the electrical connections must be shielded and grounded as shown in Table 139 below.
  • Page 104 Appendix B. CGA 351 User’s Manual...

  • Page 105: Optional Enclosures

    Chapter 2, Installation, will still apply in general terms, some of the details may vary for different enclosure types. C.1.2 Rack Mount Installation The CGA 351 analyzer is available in a rack mount enclosure for installation in a standard 19” electronics rack (see Figure 6 below). Figure 6: CGA 351 Rack Mount Version C.1.2a...
  • Page 106 Connecting the Sample System For the best results, the sample system should be mounted as close to the CGA 351 analyzer as possible. See Figure 7 below for the location of the Swagelok fittings on the rear panel, and complete the following steps: Using 1/8”...

  • Page 107: C.1.3 Rack Mount Operation

    To connect line power to the rack mount CGA 351 analyzer, use the power cable supplied with the unit. Plug one end of the cable into the connector on the rear panel and the other end into the power source, then flip the power switch to the “on”...
  • Page 108 Replace the fuses with new ones of the same type and rating. See Chapter 6, Specifications , for the correct fuse to use. Reinsert the fuse holders, making sure the arrows are pointing down, and close the fuse access door. The Rack Mount CGA 351 may now be placed back into service. Fuse Access Door Fuse Holder...
  • Page 109 17.15 (436) 18.44 (468) Dimensions are in inches (millimeters). 19.78 (502) 18.67 (474) 18.25 (464) 0.90 (23) 7.00 5.25 6.75 (178) (133) (171) 19.00 (483) CGA 351 User’s Manual...
  • Page 110 Normally Open (Standard Mode) Black ALARM 2 Common White/Red Normally Closed (Failsafe Mode) White/Red C G + NO C NC NO C NC COMM 4-20mA ALARM 1 ALARM 2 HEATER 90-265 VAC MAIN PRINTED CIRCUIT BOARD CGA 351 User’s Manual...
  • Page 111 Output Terminal Block Gas Fittings Zirconia Oxygen Analyzer Main Printed Circuit Board Sensor Enclosure (see Figure 5-2) WARNING: Hot surfaces Digital Panel Meter Sample Meter Bypass Meter CGA 351 User’s Manual...
  • Page 112 CGA 351 User’s Manual...
  • Page 113 Oxygen Errors ..........74 CGA 351 User’s Manual...
  • Page 114 Stop Bits..........58 CGA 351 User’s Manual...
  • Page 115 DECLARATION CONFORMITY Panametrics Limited Shannon Industrial Estate Shannon, County Clare Ireland declare under our sole responsibility that the CGA351 Clean Gas Analyzer CGA350GP Clean Gas Analyzer CGA350X Clean Gas Analyzer CGA350D Display Unit TMO2D Display and Control Unit to which this declaration relates, are in conformity with the following standards: •...
  • Page 116 DECLARATION CONFORMITE Panametrics Limited Nous, Shannon Industrial Estate Shannon, County Clare Ireland déclarons sous notre propre responsabilité que les CGA351 Clean Gas Analyzer CGA350GP Clean Gas Analyzer CGA350X Clean Gas Analyzer CGA350D Display Unit TMO2D Display and Control Unit rélatif á cette déclaration, sont en conformité avec les documents suivants: •...
  • Page 117 KONFORMITÄTS- ERKLÄRUNG Wir, Panametrics Limited Shannon Industrial Estate Shannon, County Clare Ireland erklären, in alleiniger Verantwortung, daß die Produkte CGA351 Clean Gas Analyzer CGA350GP Clean Gas Analyzer CGA350X Clean Gas Analyzer CGA350D Display Unit TMO2D Display and Control Unit folgende Normen erfüllen: •...
  • Page 119 Customer Support Centers U.S.A. The Boston Center 1100 Technology Park Drive Billerica, MA 01821 U.S.A. Tel: 800 833 9438 (toll-free) 978 437 1000 E-mail: mstechsupport@bakerhughes.com Ireland Sensing House Shannon Free Zone East Shannon, County Clare Ireland Tel: +353 61 470200 E-mail: mstechsupport@bakerhughes.com Copyright 2021 Baker Hughes company.

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