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Servomex 700B Instruction Manual

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700B
Oxygen Analyser
Instruction Manual
Ref : 00700 / 001B / 9
Order as part No. 00700 001B

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Summary of Contents for Servomex 700B

  • Page 1 700B Oxygen Analyser Instruction Manual Ref : 00700 / 001B / 9 Order as part No. 00700 001B...
  • Page 2 NOTES...
  • Page 3 MAINTENANCE AND REPAIR OF THE ELECTRICAL UNITS IS TO BE UNDERTAKEN ONLY BY PERSONS FULLY AWARE OF THE DANGER INVOLVED AND WHO HAVE TAKEN ADEQUATE PRECAUTIONS. WARNING This 700B analyser is not suitable for use in hazardous areas without a suitable purge.
  • Page 4 CAUTION To maintain the analyser's performance only spares of suitable quality should be used to repair this analyser. These should be obtained from either Servomex, its associated companies or local agents. NOTICE Information in this manual is intended only to assist our customers in the efficient operation of our equipment.
  • Page 5 700B OXYGEN ANALYSER INSTRUCTION MANUAL CONTENTS SECTION INTRODUCTION ANALYSER DESCRIPTION INSTALLATION OPERATION MAINTENANCE FUNCTIONAL DESCRIPTION AND SPECIFICATION RECOMMENDED SPARES AND PARTS LIST APPENDICES APPENDIX INTERCONNECTIONS - OXYGEN ONLY INTERCONNECTIONS - OXYGEN AND COMBUSTIBLES CABLE SCHEDULES PURGE DETAILS...
  • Page 6 NOTES...
  • Page 7 INTRODUCTION TO 700B ........
  • Page 8 NOTES...
  • Page 9 Recommended spares and parts lists ANALYSER OVERVIEW The Servomex 700B Zirconia Oxygen analyser measures combustion and similar gases to provide an analysis of oxygen concentration. Where the relevant option is fitted, indication of the level of unburned combustibles is given.
  • Page 10 HAZARDOUS AREA USE The standard unpurged 700B is suitable only for use in safe areas. The 700B control unit and sensor head for installation in hazardous areas may also be purged. OPTIONS Options available include isolated analogue output and alarms, a data link, facilities for calculating and displaying flue gas temperature and combustion efficiency (using an external thermocouple).

  • Page 11: Table Of Contents

    SECTION 2 : ANALYSER DESCRIPTION LIST OF CONTENTS SECTION PAGE INTRODUCTION ............2.3 CONTROL UNIT DESCRIPTION .
  • Page 12 NOTES...

  • Page 13: Control Unit Description

    SECTION 2 ANALYSER DESCRIPTION 2.1. INTRODUCTION The analyser comprises two separate units, the sensor head and the control unit, which may be mounted up to 300m apart. Refer to Appendix 3. The sensor head mounts directly onto the flue with a probe tube which projects through the duct wall into the process gas to draw out a sample for analysis.

  • Page 14: Control Unit Functions

    interrogation of alarms which may arise within the analyser. If the temperature and efficiency option is fitted, flue gas temperature and combustion efficiency can be displayed. 2.2.3 Control Unit Functions The main board of the control unit inputs the analogue signals from the sensors via a 12 bit A to D converter.

  • Page 15: Sensor Head Description

    The oxygen and optional combustible sensors are mounted external to the flue. Sample gas is drawn through the sensors by means of an air driven aspirator. The oxygen content of the sample is measured with the well-proven Servomex zirconia cell. The optional combustibles sensor is a Constant Temperature Catalytic (CTC) sensor and is used to determine the level of combustible gases (expressed as carbon monoxide) in the sample stream.

  • Page 16: Sensor Head Flow Schematic

    Figure 2.2 Sensor Head Flow Schematic A small portion of the aspirator air supply is tapped via the capillary restrictor/flame trap (11) to provide a reference oxygen level in the reference side of the oxygen measuring cell (6). The total sample gas flow is monitored by the flow sensor (8) which initiates an alarm if the sample flow drops below a preset level.

  • Page 17: Air Regulator Units

    The terminal block on the sensor head contains voltage selector links to adapt the unit to the local supply voltage. AIR REGULATOR UNITS Three types of air regulator unit are available which are designed for different applications. In all cases inlet air pressure should be in the range 0.6 - 6 barg (10 - 100 psig). 2.4.1 Oxygen Only Analysers This is a simple air pressure regulator which controls the air pressure applied to the aspirator in...

  • Page 18: Mounting Flange

    Figure 2.3 Flow Schematic - Air Supply and Calibration Unit MOUNTING FLANGE The flue has to be fitted with a flange for attachment of the sensor head. The standard flanges are suitable for a skin temperature up to 350 C (662 F).

  • Page 19: Probe Tubes

    PROBE TUBES A wide range of probe tubes, with or without filters, is available. Servomex can advise on the choice of probe for a specific application. Standard probes include: Unsupported filter probes up to 1 metre long for a maximum flue gas temperature of...
  • Page 20 The analyser fault alarm will warn of the following: Low sample flow Sensor head under or over temperature Oxygen cell under or over temperature Oxygen cell output out of limits In addition to the volt-free contact alarm there are three non-isolated alarms for: Oxygen high Oxygen low Analyser fault (alarms as above)
  • Page 21 Assembly of 700B System ........

  • Page 22: Figure Page

    LIST OF CONTENTS (Continued) SECTION PAGE ASPIRATOR AIR SUPPLY ..........3.25 3.8.1 Air Regulator Set (Oxygen only analysers) .
  • Page 23 LIST OF ILLUSTRATIONS (Continued) FIGURE PAGE 3.7A Control Unit Signal Connections ..........3.15 Split Electrical Supply .
  • Page 24 NOTES...

  • Page 25: Introduction

    INSTALLATION INTRODUCTION 3.1.1 General This Section gives details on the installation of the Model 700B analyser and the various options which are available. Specific standards of safety are not included in this manual, since requirements of relevant authorities vary widely.

  • Page 26: Recommended Installation Procedure

    Cables must comply with local electrical safety requirements. Cable glands and unused gland holes should be weatherproof to IP standards, see Section 6.1.2.7. Adaptors are included to enable 20mm glands to be used. A gland kit for the 700B is available (part no. 00700999).

  • Page 27: Installation Of Control Unit And Option Cards

    Fully calibrate analyser and set up parameters as required. (Refer to sections 4.6 & 4.7) The analyser is now fully operational and should be left powered up continuously. Note : Where options are fitted, the additional installation, both mechanical and electrical, should be incorporated with the above as convenient.

  • Page 28: Interface Card

    3.2.2 Interface Card WARNING Disconnect the electrical supply before fitting this or any option card. Open the control unit case and plug the interface adaptor card (00722901) into the main board, making sure that the card is correctly orientated, see Figure 3.2 (this card will already be fitted if options were specified originally).

  • Page 29: Installation Of Sensor Head And Probe Tube

    Figure 3.2 Fitting Option Cards INSTALLATION OF SENSOR HEAD AND PROBE TUBE 3.3.1 General The sensor head is designed with a flange to mount to the flue/process duct. It is essential that all the mounting bolts are tightened evenly during installation to prevent the sensor head tilting and thus causing a leak.

  • Page 30: Mounting Flange

    3.3.2 Mounting Flange Two mounting flange options are available for mating surface temperature up to 350°C. One flange is designed for use with flues where the wall is thick enough to permit the flange to be welded to it. The second flange is designed to be bolted to the flue wall where it is either inconvenient or too thin to permit welding.

  • Page 31: Mounting Flange Orientation

    The flange is then welded to the free end of this pipe. This pipe is not supplied by Servomex. For dimensions see Figure 3.5B. Note : When a length of tube is used on a circular duct it should be lagged to prevent problems occurring due to excessive heat loss to the atmosphere.

  • Page 32: Bolt-On Flange

    Figure 3.5B Mounting Flange Orientation - Circular Flue Ducting 3.3.5 Bolt-on Flange This flange may be bolted to the flue wall using screws into tapped holes or by using screws through clearance holes with securing nuts on the inner flue wall. Refer to figure 3.5C. Cut a hole 96mm in diameter in the wall of the flue.

  • Page 33: Sensor Head Orientation Details

    3.3.6 Sensor Head Orientation Details The preferred orientations of the sensor head are shown in Figure 3.6. If the sensor head is mounted in a non-preferred orientation the accuracy or service life may be reduced. Figure 3.6 Preferred Sensor Head Orientations SENSOR HEAD TO CONTROL UNIT INTERCONNECTION 3.4.1 General...

  • Page 34: Heater/Power Cable

    Ensure that link LK9 on the main circuit board is installed. See Figure 5.1 Ensure that terminals 9 and 10 on TB3 in the control unit are linked as shown in the wiring diagram in appendices 1 and 2. See Figure 5.1 If the auxiliary air option is used, the link LK1 on the combustibles card 00722925 must be removed.

  • Page 35: Signals Cable

    3.4.3 Signals Cable A cable with 5 twisted pairs is used for signals from the sensor head to the control unit . If the analyser has the combustibles option then 10 twisted pairs are required. Note: All the signal cables must have a braided overall screen or a foil overall screen and drain wire. On cables not connected to the sensor head, the screen should be terminated at the earth bus bar as shown in Figure 3.7A The cables connected to the sensor head should be terminated at the capacitive earth terminals on the ends of the earth bus bar as shown - two are provided, one for...

  • Page 36: Ac Electrical Supply

    3.4.4 AC Electrical Supply The analyser is not fitted with a switch for disconnecting the electrical supply. A suitable isolating switch must be installed by the user. Caution Ensure that the voltage selector links in the control unit and sensor head are correct for the supply voltage (see Figs 3.9 and 3.10).
  • Page 37 3.4.4.1 CE Marked Analyser The mains power connection to this instrument is made via an electrical filter unit attached to the bottom of the case. The power cable into this unit does not need to be screened. To connect the Control Unit to the mains supply: Isolate the mains supply at source.
  • Page 38 Figure 3.9 Supply Voltage Adjustment - Control Unit Figure 3.10 Supply Voltage Adjustment - Sensor Head 3.18...

  • Page 39: Output Connections

    OUTPUT CONNECTIONS 3.5.1 General CAUTION Connections to isolated output signal terminals should not exceed 30V RMS (42.4 V peak) or 60 V dc to earth when connected to associated equipment. Output cables must have an overall screen which must be connected to earth (ground) at one point only, preferably at the control unit .

  • Page 40: Isolated Outputs

    For operating external alarm annunciators a + 5V supply is available at terminal 4. Maximum current that can be taken is 100mA. See Figure 3.13. Figure 3.12 Non-isolated Combustibles Output Signal The relay is not supplied by Servomex. The selected relay must comply with the specification given for the alarm output and internal 5V supply.

  • Page 41: Isolated Oxygen Output And Alarm Card

    Current output: 0/4 - 20mA for range selected R (max) = 1000 ohms Max isolation voltage = 500V peak It is good practice for the current output loop to be connected either to earth (ground) or to within a low potential of earth. Figure 3.14 Isolated Oxygen and Combustibles Output Connections 3.5.4.2 Isolated Oxygen Output and Alarm Card (See Figure 3.15) The isolated oxygen output is available from TB11 terminals 3 and 4 for current and terminals 5...

  • Page 42: Data Link Card

    Alarm output: Open collector I (max) = 500mA V (max) = 24V VA (max) = 600mW Open circuit in alarm condition (see Figure 3,13) Figure 3.15 Isolated Oxygen Level and Alarm Connections DATA LINK CARD This card (see Figure 3.16) requires both output and input connections. The output is taken from TB30: Current loop: Terminals 1(+) and 2(-)

  • Page 43: Data Link

    Figure 3.16 Data Link Connections TEMPERATURE AND EFFICIENCY OPTION 3.7.1 Temperature and Efficiency Card Temperature can be in displayed in Celsius or Fahrenheit. For a Celsius display the link LK1 (located at the top left of the card) is removed. For a Fahrenheit display a link is fitted at LK1. The card is calibrated for Type K (Chromel-Alumel) thermocouples.

  • Page 44: Installation Of Flue And Inlet Air Thermocouples

    A second type K thermocouple may be connected to terminals 3 and 4 of TB40 to measure the temperature of the inlet air. Type K compensating cable can be supplied by Servomex, part no. 1582-0998 The outputs from the card are taken from TB41:...

  • Page 45: Aspirator Air Supply

    ASPIRATOR AIR SUPPLY Servomex supply three air regulator sets to control the air supply to the aspirator to the close tolerances necessary to ensure consistent and accurate operation of the analyser. The compressed air supply should be within the pressure range 0.6 - 10 barg (10 - 150 psig) and be clean dry and free of combustibles.
  • Page 46 Figure 3.19 Air Supply Regulator (oxygen only) 3.26...
  • Page 47 Figure 3.20 Air Supply Regulator (oxygen and combustibles) 3.27...
  • Page 48 3.28...

  • Page 49: Assembly Of Probe Tubes And Sensor Head

    Figure 3.21 Air Regulator Set (oxygen and combustibles analyser with auxiliary air). ASSEMBLY OF PROBE TUBES AND SENSOR HEAD 3.9.1 General There are many possible configurations for the probe assemblies but for clarity only the most commonly used versions are shown. It is recommended that the analyser should be powered-up before the sensor head is fitted to the flue.

  • Page 50: Unsupported Filter Probe

    The sensor head, as supplied, vents back to the flue. With the exception of the unsupported probe version, it is possible to vent to atmosphere providing the flue pressure is within +/- 50mmwg. To convert to vent to atmosphere the plug (14) in figure 3.23 and (10) in figures 3.24 and 3.25 should be removed and replaced in the vent hole on the front face of the sensor head.
  • Page 51 Item Description Part number Item Description Part Number Filter 2377-6777 Gasket 3931-6491 M10 washer 2131-7462 M10 stud 00022451A M10 nut 2247-8115 Tube coupling 2354-2060 Probe assembly 00714480A-B 00022471 Ferrule 1/4in 2354-8936 Figure 3.22 Installation of Unsupported Filter Probe 3.31...

  • Page 52: Supported Filter Probe

    3.9.3 Supported Filter Probe The probe assembly is normally supplied in a range of lengths from 0.5m to 3.0m in 0.5m steps. The support and sample tubes may be cut to intermediate lengths. The length of the 1/4 inch O.D. probe tube required is equal to: Support Tube + Flange Assembly Length + 48 mm.
  • Page 53 Item Description Part number Item Description Part Number Shroud assembly 00714919 Gasket 'B' 3931-6491 Support tube assy 00714918A-F Filter 2377-6777 Sample tube 00714480A-F Ferrule 1/4in 2354-8936 00022471 Tube coupling 2354-2060 M10 stud 00022451B Vent plug 2348-8568 Gasket 'A' 3931-6617 M10 nut 2247-8115 M10 washer 2131-7462...

  • Page 54: High Temperature Probe

    3.9.4 High Temperature Probe See Figure 3.24. Fit four studs (7) and the gasket 'B' to the mounting flange. Ensure that the studs are fully screwed in. Assemble the probe tube to the vent flange using the sealing washer (5). Insert the probe tube in to the flue and secure using four nuts only and the box spanner provided.
  • Page 55 Item Description Part number Item Description Part Number Probe tube Sealing washer 2356-7562 High temp alloy 00714944A-D M10 stud 00022451B Ceramic, <1600C 00714909A-C M10 nut 2247-8115 Ceramic, <1800C 00714909D-F M10 washer 2131-7462 Gasket 'A' 3931-6617 Vent plug 2348-8568 Gasket 'B' 3931-6491 Vent flange 00714433...
  • Page 56 3.9.5 High Temperature Probes with Stand-off See Figure 3.25. Secure the stand-off (1) to the mounting flange using four M10 caphead bolts (6) and one of the gaskets 'B' (4). The stand-off must be used if the flue skin temperature is between 350°C and 500°C (662°F and 932°F).
  • Page 57 Item Description Part number Item Description Part Number Stand-off assembly 00714920A Sealing washer 2356-7562 Probe tube M10 stud 00022451B High temp alloy 00714944A-D M10 nut 2247-8115 Ceramic, <1600C 00714909A-C M10 washer 2131-7462 Ceramic, <1800C 00714909D-F Vent plug 2348-8568 Gasket 'A' 3931-6617 Vent flange 00714433...

  • Page 58: Calibrating Gases

    3.10 CALIBRATING GASES The following calibration gases must be available: Oxygen Sensor: Air point: Clean, dry air, free of combustibles. Plant compressed air may be used providing it is clean and free of water and oil vapour. End point: 0.3% O in N , nominal, is recommended (can be in the range 0.25 to 2.5% O ).

  • Page 59: Initial Start-Up

    Check that the calibration port is sealed to prevent air ingress. If an isolating valve is fitted it should be closed. Check that the correct electrical supply fuse (F2) in the control unit has been fitted. See 3.4.4. 3.12.1 Initial Start-up When the electrical supply is switched on, the display will indicate 'RESTART' shortly before displaying the message 'PROBE 713/4' which identifies the type of sensor head fitted.
  • Page 60 NOTES...
  • Page 61 SECTION 4 : OPERATION LIST OF CONTENTS SECTION PAGE GENERAL ............. . . 4.3 USE OF KEYPAD .
  • Page 62 CONTENTS (continued) SECTION PAGE CHANGING THE PASSWORD ..........4.35 ALARMS AND FAULTS .

  • Page 63: General

    The analyser can be requested, via the keypad, to display messages to aid fault diagnosis. Note: All instruments are despatched with the password set to: 000 If a new password is assigned make a note of it and store in a safe place. If it is lost, contact Servomex. USE OF KEYPAD 4.2.1 General The keypad (refer to Figure 4.3) is colour coded and annotated to simplify operation.
  • Page 64 KEY FUNCTIONS NORMAL OPERATION PROTECTED OPERATION Displays measured oxygen level Oxygen functions Displays measured combustibles level Combustibles function Displays efficiency Efficiency functions Displays flue gas temperature Flow functions Accesses calibration routines Accesses calibration routines Accesses parameter routines Accesses parameter routines First press will exit from the current activity Second press returns the Resets display to show oxygen...
  • Page 65 KEY FUNCTIONS NORMAL OPERATION PROTECTED OPERATION Invalid key Change a value Not Used Not Used Not Used Not Used Not Used Not Used Not Used Not Used Press to move onto another function in Press to move on to another function in a particular sequence a particular sequence Calibration mode : Invalid key...
  • Page 66 Figure 4.2 Keypad Function Overview...
  • Page 67 Figure 4.2 Keypad Function Overview...

  • Page 68: Analyser Operation Via The Keypad

    Figure 4.3 Keypad Layout ANALYSER OPERATION VIA THE KEYPAD Figure 4.2 shows in overview how the keypad command system is structured. Only principal displays are shown but the keypress sequences demonstrate how to move around the system, displaying the measurements, interrogating system alarms and faults and entering the password protected parameter and calibration routines.

  • Page 69: Restart

    is returned to the oxygen display by pressing 'Normal' twice. The message 'Saving Data' will appear briefly. 4.3.3 Restart This is the microprocessor initialisation procedure. It occurs: After Power Up or Power Fail. If main board reset button is pressed. If the processor 'Watchdog' circuit detects a processor malfunction.

  • Page 70: Display Modes

    DISPLAY MODES As standard the analyser indicates oxygen. Depending on options fitted it is also possible to display combustibles, flue temperature or efficiency, either alone or combined with the oxygen display. 4.4.1 Single Measurement DESCRIPTION DISPLAY MEANING Request the OXYGEN NN.N NN.N is the % oxygen measurement analyser to display displayed over the range 0.1 to 21.0%.

  • Page 71: Display

    4.4.2 Dual Display of Oxygen Level with Combustibles, Temperature or Efficiency This function is only available when the combustibles and/or temperature and efficiency options are fitted and it enables the operator to observe two measurements simultaneously. Dual displays do not time out to 'OXYGEN' display. On any `RESTART' the dual display will revert to `OXYGEN' display.

  • Page 72: Password Entry

    4.4.2.3 Oxygen and Efficiency Dual Display DESCRIPTION DISPLAY MEANING From a display of OXYGEN XY.Z XY.Z is current oxygen level. typically : To select oxygen EF.NN GAS Current efficiency reading NN%. The and efficiency fuel is gas. display. OUT OF See Section 4.4.1.
  • Page 73 DESCRIPTION DISPLAY MEANING Command the WRONG Indicates that the entered password analyser to accept was wrong. Displayed for 2.5 seconds the password. before reverting to oxygen reading. Check password and then recommence the entry routine. PARAMETER ? Parameter access selected, password correct, proceed to parameter sections of this manual.

  • Page 74: Exit From A Parameter Or Calibrate Routine

    4.5.2 Exit From a Parameter or Calibrate Routine Note: This key sequence is shown in summary at the end of each protected routine. DESCRIPTION DISPLAY MEANING Last step in present Routine complete. Display has returned routine. to start of loop. If satisfied that all settings in this loop are as required, press `Normal' (Use `Continue' key to review list).

  • Page 75: Setting-Up Analyser And Outputs

    SETTING-UP ANALYSER AND OUTPUTS 4.6.1 Flow Alarm Trip Level Parameter The flow alarm trip level can be set to trip either at zero flow (<10%) or at low flow (approximately 20% of nominal full flow). Enter password for parameter functions. DESCRIPTION DISPLAY MEANING...

  • Page 76: Oxygen Output (Non-Isolated)

    DESCRIPTION DISPLAY MEANING Exit from this PARAMETER ? routine. Command analyser PARAMETER Data stored in permanent memory. to store data. then OXYGEN NN.N 4.6.2 Oxygen Output (non-isolated) Note: 1. If the isolated oxygen output and alarm card is fitted (00722911) then its output may be set differently to the standard, mainboard, non-isolated output.
  • Page 77 DESCRIPTION DISPLAY MEANING Select the required OX.RANGE MM Where MM is the new output range. oxygen output range. 2.5, 5, 10 or 25%O Command the OX.ZERO LIVE Analogue output for oxygen is analyser to accept 4 to 20 mA and 2 to 10V (TB2). the information and move onto the next function.

  • Page 78: Combustibles Output

    4.6.3 Combustibles Output Note : If the isolated oxygen and combustibles card (00722921) is fitted then the oxygen output is the same as the standard mainboard, non-isolated output and there is only one parameter setting routine for both outputs. Enter password for parameter functions. DESCRIPTION DISPLAY MEANING...
  • Page 79 DESCRIPTION DISPLAY MEANING Command the CO.ZERO LIVE Analogue output for combustibles is analyser to accept 4 to 20 mA and 2 to 10V (TB50). the information and move onto the next function. CO.ZERO TRUE Analogue output for combustibles is 0 to 20mA and 0 to 10V (TB50). Select live or true CO.ZERO LIVE zero for the...

  • Page 80: Oxygen Output (Isolated) And Alarms

    4.6.4 Oxygen Output (isolated) and Alarms Note: 1. This section also includes information on setting the standard, main board, non-isolated oxygen output. If the isolated oxygen output and alarm card is fitted (00722911) then its output may be set differently to the standard, mainboard, non-isolated output. Enter password for parameter functions.
  • Page 81 DESCRIPTION DISPLAY MEANING Select the required OX.AL.H.YY.Y Where YY.Y is the new setting of the high alarm level. high alarm, YY.Y will indicate OFF if the alarm is set to above 24.9% O Oxygen high alarm is then inoperative. Command the I.OX.RANGE XX Where XX is the isolated analogue analyser to accept output range information in % oxygen.
  • Page 82 DESCRIPTION DISPLAY MEANING Command the OX.ZERO LIVE Standard non-isolated output is analyser to accept 2 to 10V and 4 to 20 mA (TB2). this information and move onto the next function. OX.ZERO Standard non-isolated output TRUE is 0 to 10V and 0 to 20mA (TB2). Select live or true OX.ZERO LIVE Non-isolated analogue output for...

  • Page 83: Temperature And Efficiency Parameters

    4.6.5 Temperature and Efficiency Parameters Note: To change temperature reading from centigrade to fahrenheit make link LK1 (wire wrap plug adjacent to IC6) on temperature and efficiency option printed circuit board (00722914). Then press reset button on main board. Enter password for parameter functions. DESCRIPTION DISPLAY MEANING...
  • Page 84 DESCRIPTION DISPLAY MEANING Command the FT.ZERO LIVE Analogue output for flue temperature is analyser to accept 4 to 20 mA and 2 to 10V. (TB41). the information and move onto the next function. FT.ZERO Analogue output for flue temperature is TRUE 0 to 20 mA and 0 to 10V.
  • Page 85 DESCRIPTION DISPLAY MEANING Select the required F.T.ALARM Where MMM is the new setting of the alarm level. alarm level. MMM will indicate OFF if the alarm is set above 999 C or 1830 F. Command the AIR TEMP.NNN Where NNN is the air temperature used analyser to accept in the efficiency calculation when an the information and...

  • Page 86: Calibration

    CALIBRATION Calibration gases are specified in Section 3.10 Details of calibration gas connections, flow rates etc. are given in Section 3.11. If the combustibles is fitted and the combustibles sensor and or the combustibles card have been changed then the combustibles board must be adjusted and the correct sensor constant entered prior to combustibles calibration.

  • Page 87: Oxygen Sensor Air Point Calibration Procedure

    DESCRIPTION DISPLAY MEANING Command the FLOW 0 SET Flow zero point has been correctly set. analyser to calibrate the flow zero point. The analyser will CAL.ERROR Sensor not settled (output of flow time out after three sensor changed significantly during the minutes unless calculation).
  • Page 88 Select air as the CAL.GAS.AIR Air point calibration has been selected. calibration point. Press `Continue' AA.AA 20.95 Where AA.AA is the measured oxygen then connect a level calculated using existing data. supply of calibration 20.95 is the air calibration point. air to the calibration Providing stability is achieved within 9 inlet of the sensor...

  • Page 89: Oxygen Sensor End Point Calibration Procedure

    4.7.4 Oxygen Sensor End Point Calibration Procedure Enter password for calibration functions. DESCRIPTION DISPLAY MEANING CALIBRATE ? Calibration functions have been selected. Select oxygen CAL.PT.AIR Air point calibration has already been sensor calibration. performed so continue onto end point calibration. Select end point CAL.PT.N.NN Where N.NN is the calibration point...
  • Page 90 DESCRIPTION DISPLAY MEANING Press `Continue' BB.BB.M.MM Where BB.BB is the measured oxygen then connect a level calculated using existing data. supply of end point Providing stability is achieved within 9 calibration gas to minutes calibration can be completed. the calibration inlet at a flow rate of 600 After 8 minutes, an asterix will show on ml/min.

  • Page 91: Combustibles Sensor Zero Calibration Procedure

    4.7.5 Combustible Sensor Zero Calibration Procedure Enter password for calibration functions. DESCRIPTION DISPLAY MEANING CALIBRATE ? Calibration functions have been selected. Select combustibles CO.ZERO ? If only span calibration is required press sensor calibration. `Continue' to jump to start of span calibration routine.
  • Page 92 DESCRIPTION DISPLAY MEANING When the display is ZERO CAL OK The zero point calibration has been stable command the successful. analyser to recalculate and update the CAL.ERROR Indicates that the sensor output calibration data such changed during the calculation. Wait for that the measured stability and press `Enter' again.

  • Page 93: Combustibles Sensor Span Calibration Procedure

    4.7.6 Combustibles Sensor Span Calibration Procedure Note : Combustibles sensor zero calibration must be performed before span calibration. Enter password for calibration functions. DESCRIPTION DISPLAY MEANING CALIBRATE ? Calibration functions have been selected. Select combustibles CO ZERO ? Zero calibration has already been sensor calibration.
  • Page 94 DESCRIPTION DISPLAY MEANING Press `Continue'. A.AAA M.MMM Where A.AAA is the measured Then connect combustibles level calculated using combustibles span existing data. gas to the Providing stability is achieved within 9 calibration inlet at a minutes, calibration can be completed. flow rate of 600 ml/min.
  • Page 95 CHANGING THE PASSWORD Note: The password to the protected functions is factory set to: 000 Enter password for parameter functions. DESCRIPTION DISPLAY MEANING PARAMETER ? Parameter functions have been selected. Select the password PASS.CHANGE ? Password routine selected. routine. Where PPP is the existing password number.
  • Page 96 DESCRIPTION DISPLAY MEANING Exit from this PARAMETER ? routine. Command analyser SAVING DATA Data stored in permanent memory. to store new data then OXYGEN NN.N ALARMS AND FAULTS An alarm or fault condition is indicated by a flashing display. Alarms are user defined and relate to process variables. Faults are malfunctions of the analyser that may result in measurement errors.
  • Page 97 DESCRIPTION DISPLAY MEANING Press if alarms are FAULT N,N,N... Faults are present N is the position of present to identify the card which has generated the fault. any faults. DDDD..Where DDDD..is the fault display. Press as many times as necessary to identify any faults.
  • Page 98 NOTES 4.38...
  • Page 99 SECTION 5 : MAINTENANCE CONTENTS SECTION PAGE GENERAL ............. . . 5.3 5.1.1 Repair Equipment and Tools .
  • Page 100 CONTENTS (continued) SECTION PAGE MAINTENANCE OF THE SAMPLE PROBE ........5.30 5.5.1 Cleaning the Probe Tube .

  • Page 101: General

    CAUTION To maintain the analyser's performance only spares of suitable quality should be used to repair this analyser. These should be obtained from Servomex, its associated companies or local agents...

  • Page 102: Repair Equipment And Tools

    The circuit boards in the control unit are tested using specialised test equipment. Faulty boards should be replaced and returned to Servomex for repair, thus no circuit diagrams are included in this manual to enable board repair at component level.

  • Page 103: Fault Diagnosis

    FAULT DIAGNOSIS In the event of analyser failure, faults can be traced by the interpretation of the fault indications on the control unit display. The analyser has two levels of fault indication: one level is to aid fault finding via a self diagnostic display, the other level ( SYS FAIL N ) is to protect and shutdown the analyser if a severe...

  • Page 104: Self Diagnostic Faults

    The oxygen cell was grossly over temperature or thermocouple SYS. FAIL 8 circuit failure. Refer to section 5.2.2.1. The thermocouple has been incorrectly cabled. SYS. FAIL 9 Refer to section 5.2.2.1. SYS. FAIL 2 ' or ' SYS. FAIL 3 ' may also arise from electromagnetic interference due to poor screening or inadequate cabling.
  • Page 105 Self Diagnostic Fault List (not including data link option) Flashing Display Description WARMING UP The analyser has been started up within the last 40 minutes. CELL TEMP HIGH Zirconia cell temperature is more than 32C above the control temperature setpoint. CELL TEMP LO Zirconia cell temperature is more than 32C below the control temperature setpoint.
  • Page 106 Figure 5.1a Location of Components On Main Board...
  • Page 107 Figure 5.1b Location of components on Combustibles board...

  • Page 108: Cell Temp Hi Or Cell Temp Lo

    5.2.2.1 CELL TEMP HI or CELL TEMP LO CELL TEMP HI or CELL TEMP LO occur when the zirconia cell temperature is more than ±32C from its set point. Note: 1. If there are problems with the sample block temperature control this will also affect the zirconia cell temperature.

  • Page 109: Ox. Range Error

    This is not an analyser fault but a process problem. Prolonged operation under these conditions may have an adverse effect on the oxygen cell. In these circumstances contact Servomex. Check: 1. Check all cabling between controller and sensor head.

  • Page 110: Cal.fail

    5.2.2.2.2 Cell Output Voltage The cell output voltage, at a cell temperature of 725C, can be calculated from: where P is the percentage oxygen concentration. This equation assumes an offset of zero. Any offset observed at the air point should be added or subtracted according to its polarity. Figure 5.2 shows the cell output and its acceptable limits.
  • Page 111 Figure 5.2 Cell Output 5.13...

  • Page 112: Co.sens Flt

    5.2.2.5 CO. SENS FLT The combustibles sensor consists of two pellistors in a heated body. A detailed description of its operation is given in Section 6. On the combustibles board (00722925) there are four diagnostic indicators which identify the specific fault (see Figure 5.1b). These indicators are for: Combustibles sensor short circuit (pcb ident)
  • Page 113 Control Unit Function Description Normal Reading Terminals TB1: 3,7 Combustibles sensor heater fuse F5 (500mA) < 2 ohms 5.2.2.5.2 Sensor short circuit indicator on and/or sensor open circuit indicator on These indicators show if a problem exists with the combustibles sensors. Note: 1.

  • Page 114: Combustibles Board (00722925) Set Up Procedure

    5.2.2.6 Combustibles Board (00722925) Set Up Procedure This board is factory set. However if the combustibles sensor and or the combustibles board are changed then the following procedure must be carried out:- Set the combustibles sensor constant to 3. Refer to section 4.6.3. Connect a supply of calibration air to the calibration inlet of the sensor head at a flow rate of 600ml/min and allow sensor to stabilize.

  • Page 115: Cal.fail

    5.2.2.7 CAL.FAIL The CAL.FAIL display only occurs within the sensor calibration routine, refer to section 4.7. In the case of the combustibles sensor this indicates that with air as calibrating gas the voltage between TP6 and TP2 on the combustibles board is not between 0 and 5 volts. Similarly the CAL.FAIL display will also occur when using 1% carbon monoxide in air as a calibrating gas if the voltage between TP6 and TP2 on the combustibles card is not between 1 and 5 volts greater than the voltage measured at the same point using air as calibrating gas.

  • Page 116: T.sensor Fail

    Check cabling between sensor head and control unit. Check that the flow trip parameter is set to the most suitable for the application. On most 700B applications we recommend setting this to F. TRIP ZERO. Refer to section 4.6.1. Check that the aspirator air solenoid valve has opened.
  • Page 117 Check that with the aspirator air correctly set, as above, that there is a sample inlet flow of approximately 300 ml/min. If not, check for a blockage in the sample system. Investigate external and internal filter, inlet probe tubes, internal pipework, flametraps and finally the sample block.

  • Page 118: Flue T.c.fail

    Control unit Function Description Normal Reading Test points TP4, TP1 Aspirator air turned off, no sample flow. 20 - 30mV typical* (Main board) TP4, TP1 Aspirator air on and set to pressure written on the 30 - 40mV typical* sensor head printed circuit board. Wait two minutes to stabilise.

  • Page 119: Repair Of The Control Unit

    The repair of printed circuit boards at component level is not recommended and it is normal to trace faults on these boards by substitution. This section covers the removal of these boards so that any faulty ones can be replaced and returned to Servomex for repair. Refer to figure 3.2 for identification and relationship of parts.

  • Page 120: Removal Of The Interface Adaptor Board

    Do not move the board from side to side extensively to remove it as this may damage the connector on the interface adaptor board. Refit in the reverse order to above - Note - Ensure that option cards 00722925 (combustibles) and 00722911 (isolated O output) are not fitted above one another.

  • Page 121: Repair Of The Sensor Head

    REPAIR OF THE SENSOR HEAD This section covers removal and replacement of the major components in the sensor head. Refer to Figure 5.3 for identification and relationship of all parts. It is recommended that anti-seize compound is used on certain gas connectors. This is detailed in the appropriate places below.
  • Page 122 Figure 5.3 Exploded view - sensor head 5.24...
  • Page 123 Figure 5.3 Exploded view - sensor head 5.25...

  • Page 124: Removal Of The Internal Filter

    5.4.2 Removal of the Internal Filter Remove the calibration pipe and filter assembly (20) by undoing and removing the two M6 socket cap screws (40) Note the type and position of the three gaskets associated with the filter (61). One (78) is located at the bottom of the filter hole in the sample block.

  • Page 125: Removal Of The Oxygen Sensor

    Disconnect the combustibles detector and compensator wiring from TB5 (see Appendix 2). The combustibles sensor and body (C) can now be removed. Re-assemble in the reverse order using a draw wire to pull the sensor leads into the terminal box. 5.4.5 Removal of the Oxygen Sensor CAUTION...

  • Page 126: Removal Of The Flow Sensor

    5.4.6 Removal of the Flow Sensor Carry out steps 1 to 3 of Section 5.4.3. Undo the 1/8 OD flow sensor coupling to oxygen cell reference assembly (23). Disconnect the flow sensor wires from terminal block TB5 (see Appendix 1) Withdraw the flow sensor.

  • Page 127: Removal Of Thermocouple Reference Assembly And Thermistor

    Note: If both heaters have been disconnected, when re-assembling, check carefully which leads belong to which heater before reconnecting to TB4 in accordance to the wiring diagram (See Appendix 1). The sample block is maintained at 200°C by two cartridge heaters, each rated at 120 volts 150 watt.

  • Page 128: Removal Of The Aspirator Assembly

    Dust entering the probe tube from the process. This will only occur if the external filter is damaged or a filter is not fitted. Check this filter or consult Servomex about fitting one. 5.30...

  • Page 129: Replacement Of The Probe Tube

    Corrosion blockages are due to the process sample falling below its dew-point temperature and condensing. This will only occur if the sensor head has not been correctly installed. Ensure that there are no cold spots along the length of the inlet tube. These may be due to mounting the sensor head on a stand-off.

  • Page 130: Retro-Fitting Of The Combustibles Sensor Kit (00714998)

    RETRO-FITTING COMBUSTIBLES SENSOR KIT (00714998) (See Figure 5.3). Turn off the electrical supply to the analyser and allow the sensor head to cool. Remove and discard the auxiliary air blanking nut (32) from the sensor head cover (18) and remove the cover. Refer to section 5.4.1. Remove and discard the combustibles sensor blanking tube (A).

  • Page 131: Servicing Of Air Filter/Regulator Unit

    Switch on the analyser and allow it to warm up and stabilize. Set up the combustibles board, 00722925 referring to section 5.2.2.6. Referring to section 4.7, calibrate the oxygen and combustibles sensors. Set in the combustibles parameter as required referring to section 4.6.3. SERVICING OF AIR FILTER/REGULATOR UNIT At monthly intervals, check all filter bowls and filters.
  • Page 132 NOTES 5.34...
  • Page 133 SECTION 6 : FUNCTIONAL DESCRIPTION AND SPECIFICATION CONTENTS SECTION PAGE SENSOR HEAD AND CONTROL UNIT ........6.3 6.1.1 Introduction .
  • Page 134 TEMPERATURE AND EFFICIENCY CARD (00722914) ......6.16 6.6.1 Description ............6.16 6.6.2 Functional Description .

  • Page 135: Sensor Head And Control Unit

    Clean dry air, free of combustibles. Plant compressed air may be used providing it is clean and free of water and oil vapour. Supply pressure (if Servomex regulators are used): 0.6 to 10 barg (10 to 150 psig) Consumption: Less than 2.5 litres/min at N.T.P. For regulation specification at Sensor Head, refer...

  • Page 136: Accuracy (Typical)

    6.1.2.4 Accuracy (typical) Under constant conditions and directly after span and air point calibration, the following accuracy will be achieved: Oxygen Output: ±0.1% oxygen up to 10% oxygen ±2.5% of reading between 10% and 21% oxygen Combustibles output: ±5% of range selected on factory calibration gases NOTE: Accuracy is defined as the net effect of non-repeatability and non-linearity.

  • Page 137: Alarms

    Oxygen alarm and system fault outputs are available via the isolated oxygen output and alarm module (refer to Section 6.4). The combustibles level alarm is available on the combustibles version of the 700B as follows: Range: 0-4.99% CO + OFF (0.01% steps)

  • Page 138: External Dimensions

    6.1.2.8 External Dimensions See outline dimensional drawings : Figures : 6.1 Control Unit 6.2 Sensor Head Weight: Sensor Head Unit: 9.0kg (20 lb) excluding probe tube Control Unit: 11.5kg (25.31 lb) 6.1.2.9 Materials of Construction Sensor Head: Terminal Box: Zinc coated mild steel with epoxy powder paint finish Heated Unit: Zinc chromated mild steel with heat resistant paint finish, aluminium reinforced calcium silicate, 303 and 316 stainless...
  • Page 139 Figure 6.1 Control Unit Dimensions...
  • Page 140 Figure 6.2 Sensor Head Dimensions...

  • Page 141: Probes/Response Times

    PROBES/RESPONSE TIMES 6.2.1 INTRODUCTION Response time depends upon probe type and length. There are essentially 5 categories of probe: < 500°C, Filter probes, unsupported < 500°C, Filter probes, supported < 1000°C, High temperature alloy probes < 1600°C, Ceramic probes < 1800°C, Ceramic probes All data given in this Section refers to the Vent to Flue Options and are typical times only.

  • Page 142: Response Times

    Sample average temperature: If the average temperature of the sample gas in the probe tube can be established or estimated by measuring temperature profile along the tube, use column 2 to find the appropriate correction factor. 6.2.2 RESPONSE TIMES Table 2 Probe Type Description DV lag...

  • Page 143: Principles Of Operation

    6.3.1 OXYGEN SENSOR The Servomex (R) zirconia sensor (Figure 6.3) is manufactured using yttria stabilised zirconia. When this material is heated to a temperature above 600°C it will conduct oxygen ions. The oxygen ion conductivity increases exponentially with temperature. The sensor consists of a disc of yttria stabilised zirconia mounted in a tube of the same material.

  • Page 144: Flow Sensor

    The output of the cell is given by the Nernst equation: where 20.95 and P are the oxygen contents of air and the sample respectively (%). For the nominal cell temperature of 725°C: (RT/nF) = 21.50mV Hence the cell output is given by: E = 21.50ln(20.95/P)mV.
  • Page 145 experience the same variations in ambient conditions and as oxidation does not occur on the passive bead the presence of combustible gas is indicated by a difference in temperature between the two beads. This can be measured by comparing the resistances of the coils or the currents passing through them.
  • Page 146 Figure 6.4 Relationship between Flue Gas Components, Combustion Efficiency and Fuel/Air Ratio 6.14...

  • Page 147: Isolated Output And Alarm Card (00722911)

    ISOLATED OUTPUT AND ALARM CARD (00722911) 6.4.1 DESCRIPTION This option card provides isolated current and voltage analogue outputs for the oxygen signal and relay contacts for general alarm. Non-isolated outputs are also provided for oxygen high, oxygen low and instrument failure alarms. The card can be fitted in any of the option positions on the interface adaptor card.

  • Page 148: Temperature And Efficiency Card

    6.4.2.4 5V Output - for operation of alarms Maximum current: 100 mA NOTE: The current and voltage outputs are not isolated from each other. DUAL ISOLATED CURRENT OUTPUT MODULE (00722921) 6.5.1 Description This option card provides isolated current output for the oxygen and combustibles signals. These outputs can be selected via the keypad and this card may be fitted in any of the option position on the interface adaptor card.

  • Page 149: Functional Description

    6.6.2 FUNCTIONAL DESCRIPTION This card accepts an input from the thermocouple which is placed in the flue gas stream. An optional inlet thermocouple may be fitted to measure the air temperature to the burner. If this thermocouple is not fitted, the equation used for calculating efficiency will use a value for air temperature entered via the keypad.

  • Page 150: Current Output (Efficiency)

    Measurement Range Flue temperature: 0-1000°C with 1 C resolution or 32-1832°F with 1 F resolution Note: Accuracy is limited by thermocouple calibration Air Inlet Temperature -20°C to 150°C with 1°C resolution or -4°F to 302°F with 1°F resolution Accuracy of Temperature Reading The flue temperature input accuracy has been optimised for a type K thermocouple in the range of 160°C to 250°C to obtain ±2°C accuracy.

  • Page 151: Alarm

    6.6.3.5 Voltage Output (Flue Gas Temperature) Output: 0 to 10V or 2 to 10V (keypad selected) Range: 0 to 500°C or 0 to 1000°C (Centigrade calibrated) 0 to 1000°F or 0 to 2000°F (Fahrenheit calibrated) Output Impedance: Less than 1 ohm Maximum Output: 5mA at 10V Short Circuit Protection: Output is limited to a safe value of approximately 5mA...

  • Page 152: Location And Function Of Dipswitches

    6.7.2 LOCATION AND FUNCTION OF DIPSWITCHES Figure 6.5 Location and Function of Dipswitches 6.20...

  • Page 153: Protocol Setting

    Table 1 Setting the Format Position of switches No of bits Parity No of stop bits EVEN EVEN NONE NONE EVEN 6.7.3 PROTOCOL SETTING There are two ways in which the datalink can be used: To connect to a remote dumb terminal acting as a parallel keypad and display (option A). Set dipswitch 6 to option A.

  • Page 154: Operation - Option A

    Transmission distance: RS232C and RS423 - up to 500 metres at baud rates between 300 and 4800 Current loop - up to 500 metres at baud rates between 300 and 9600 6.7.5 OPERATION - OPTION A 6.7.5.1 Option A Enables a dumb terminal, or a computer emulating a dumb terminal, to behave as a remote parallel keypad and display.

  • Page 155: Echo Facility

    90 seconds. This feature is selected by dipswitch 1 on the board. 6.7.5.4 Messages This facility is normally used by Servomex engineers when carrying out remote servicing. It allows defined messages to be displayed on the control unit by transmission of a single character from the dumb terminal.

  • Page 156: Data Transmission Format

    NOTE: Characters are not transmitted from the analyser in a continuous train. There may be a gap of up to 10 ms between characters. Worst case times for transmission of requested information are as follows: Option B - 5 seconds Option C - 500 ms This assumes a transmission rate of 300 baud and the use of a checksum.
  • Page 157 Table 3 ASCII Commands for Option B ASCII Data Required Format Command Oxygen Oooooo Cccccc Tttttt Eeeeee Combustibles Temperature of flue C or %Eff % Efficiency (as set on PCB) Fault status for FOff mainboard and six option cards Mainboard Option cards.
  • Page 158 ASCII Data Requested Format Command Oxygen cell Z ttttt temperature in - temp in Oven temperature B 11111 - temp (no units) Oxygen sensor zero z xxxxx calibration point - Zero point calibration point (O Oxygen sensor span s xxxxx calibration point - Span calibration point (O Flow sensor zero...
  • Page 159 6.7.6.3 Interpretation of Fault and Alarm Messages The interpretation of the fault and alarm messages depends on knowing which option card is fitted in each option location. By entering the ASCII code "o" this information will be given. Each option card has its own set of faults and alarm messages which are interpreted as follows: Table 4 Fault Messages...

  • Page 160: Self Testing Facility

    Table 6 ASCII Commands for Option C ASCII Code Data Requested Format Measured oxygen level 00021.0 Flue temp %001000 C or F depending on setting of link on T&E card) Air inlet temp I000020 Efficiency E000075 Measured combustibles C04.800 Alarm/fault status D0000AF (alarms &...

  • Page 161: List Of Illustrations

    SECTION 7 : RECOMMENDED SPARES AND PARTS LIST CONTENTS SECTION PAGE RECOMMENDED SPARES ..........7.3 7.1.1 General .
  • Page 162 Figure 7.1 Component Location - Control Unit...

  • Page 163: Control Unit Dimensions

    SECTION 7 : RECOMMENDED SPARES AND PARTS LIST RECOMMENDED SPARES 7.1.1 General The quantities given in the following recommended spares list are based on experience and our normal service support. If the analyser is being used where minimal down-time is required then the quantities must be adjusted accordingly.
  • Page 164 Figure 7.2 Sensor Head - Exploded View...
  • Page 165 Figure 7.2 Sensor Head - Exploded View...

  • Page 166: Sensor Head

    7.1.3 Sensor Head Refer to figure 7.2 Item Description No. of Analysers Part Number Number Zirconia Oxygen Sensor 00703000 Combustibles Sensor and Housing 00706701 Assembly (Heaters and Temperature Sensors are not included) Flow Sensor (See Note) 00705000 Flame Trap 00022907 Cartridge Heaters, Sample Block 2653-1159 Cartridge Heaters, Combustibles Block...

  • Page 167: Sample Probes

    7.1.4 Sample Probes The following recommended spares are for standard probes only. If a special probe has been supplied please refer to manual addendum or consult Servomex. 7.1.4.1 Unsupported Filter Probe, Stainless Steel, Upto 500°C Refer to figure 7.3 Item Description No.
  • Page 168 7.1.4.2 Supported Filter Probe Stainless Steel Upto 500°C Refer to Figure 7.4 Item Description No. of Analysers Part Number Number Filter 2377-6777 Filter Nut 00022471 Ferrule 1/4" O.D. for Probe Tube 2354-8936 Probe Tube for Insertion Lengths of : 0.5 MR 00714480A 1.0 MR 00714480B...
  • Page 169 7.1.4.3 High Temperature Probes upto 1800°C Refer to figure 7.5 Item Description No. of Analysers Part Number Number Probe < 1000 C Alloy 0.5 MR 00714944A 1.0 MR 00714944B 1.5 MR 00714944C 2.0 MR 00714944D Probe < 1600 C Ceramic 0.5 MR 00714909A 1.0 MR...

  • Page 170: Parts List

    Parts List 7.2.1 Control Unit Refer to Figure 7.1 Item Number Description Part Number *Interface Adaptor Card S0722901 Main Microprocessor Card S0722902 Display Card 00722903 *Isolated Output and Alarm Card 00722911 *Data Link Card S0722913 *Temperature and Efficiency Card 00722914 *Combustibles Card S0722925 *Isolated Oxygen and Combustibles Card...

  • Page 171: Sensor Head

    7.2.2 Sensor Head Refer to figure 7.2 Item Number Description Part Number Flame Trap 00022907 Zirconia O Cell 00703000 Flow Sensor 00705000 Thermostat Assembly, Over Temp, N/C 00711909 Thermostat Assembly, N/O <185 00711925 Cover, Terminals 00714528 Union Screw (M14 x 1.25) 00714425 Union Screw (M12 x 1.25) 00714426...
  • Page 172 Item Number Description Part Number Blanking plug+nut+washer M20Insulator, 2512-8484 Ceramic bead spacer 2513-8137 Washer, cable clamping M4 2515-8324 Thermistor 2651-7124 Cartridge heater 120V, 150W 2653-1159 Insulation liner, cover 3912-7024 Insulation, terminal box 3921-7426 Gasket PTFE 9.5mm ID 3931-7090 Gasket (134OD 90 ID) 3931-6578 Gasket (21 OD 13.5ID) 3931-6718...

  • Page 173: Sample Probes

    7.2.3 Sample Probes Parts list information for standard probes may be found in section 3.9 of this manual. For information on special probes, please refer to the manual addendum or consult Servomex. 7.13...
  • Page 174 NOTES 7.14...
  • Page 175 Appendices Appendix 1 ..........Interconnections - Oxygen Only Appendix 2 .
  • Page 176 NOTES...
  • Page 177 Appendix 1 Interconnections - Oxygen Only A1.1...
  • Page 178 A1.2...
  • Page 179 A1.3...
  • Page 180 NOTES A1.4...
  • Page 181 Appendix 2 Interconnections - Oxygen and Combustibles A2.1...
  • Page 182 A2.2...
  • Page 183 A2.3...
  • Page 184 NOTES A2.4...
  • Page 185 Appendix 3 Cable Schedules A3.1...
  • Page 186 This Schedule is to be used as an installation and check document and should be witnessed by engineer(s) responsible. Performance may be degraded if installation practice varies from this schedule. Refer to Servomex for particular enquiries. INSTALLATION SUPPLY VOLTAGE___________ VOLTS_______ Hz 1) CHECK THAT INSTRUMENT(S) VOLTAGE TAPPINGS ARE CORRECT...
  • Page 187 Cut back and insulate free end of screen. Drawn M.L. Issue Checked Approved No CS 00700B Date 05/93 Date 20.08.98 Date 20.08.98 Sheet Sheet 3 of 8 SERVOMEX CABLE SCHEDULE CABLE DESCRIPTION Cable Function Cable No 1 A3.3...
  • Page 188 Cable Glands 2 off 2512-1647 Indiv. Screen Special Cable See Note on Sheet 2 O/All Screen Maximum Loop Resistance 36 ohms Conductor Cross Section (mm Maximum Separation (metres) Servomex Part Number 0.5 (16/0.2) 1566-8633 TERMINATION 'A' TERMINATION 'B' 00714 Sensor Head Conductor Ident...
  • Page 189 Outer Sheath Indiv. Screen Special Cable See Note on Sheet 2 O/All Screen Maximum Loop Resistance <4 ohms Conductor Cross Section (mm Maximum Separation (metres) Servomex Part Number 1.0 (32/0.2) 1566-8431 1.5 (30/0.25) 1566-8448 2.5 (50/0.25) 1566-8455 TERMINATION 'A' TERMINATION 'B'...
  • Page 190 Indiv. Screen Special Cable See Note on Sheet 2 O/All Screen Maximum Loop Resistance --- ohms Conductor Cross Section (mm Maximum Separation (metres) Servomex Part Number 0.8 (1/0.8) 1582-0998 TERMINATION 'A' CABLE 5 TERMINATION 'B' Temperature & Efficiency Flue Gas Thermocouple...
  • Page 191 Outer Sheath Indiv. Screen Special Cable See Note on Sheet 2 O/All Screen Maximum Loop Resistance <6.0 ohms Conductor Cross Section (mm Maximum Separation (metres) Servomex Part Number 0.5 (16/0.2) 1566-8657 ---- ---- TERMINATION 'A' TERMINATION 'B' 714 Sensor Head...
  • Page 192 Indiv. Screen Special Cable See Note on O/All Screen Maximum Loop Resistance <4 ohms Sheet 2 Conductor Cross Section (mm Maximum Separation (metres) Servomex Part Number 1.0 (32/0.2) 1566-8431 TERMINATION 'A' TERMINATION 'B' 714 Sensor Head 722 Controller PCB 00714901A...
  • Page 193 Special Cable See Note on O/All Screen Maximum Loop Resistance --- ohms Sheet 2 Conductor Cross Section (mm Maximum Separation (metres) Servomex Part Number 1.0 (32/0.2) 23 @ 110 VAC 1566-8215 1.0 (32/0.2) 55 @ 240 VAC 1566-8215 TERMINATION 'A'...
  • Page 194 NOTES A3.10...
  • Page 195 Appendix 4 Purge Details CONTENTS Section Page A4.1 General ............. . . A4.2 A4.2 Requirements .
  • Page 196 A4.2 Requirements The 700B series sensor heads have a purge inlet, purge outlet and a pressure sense port (see figure 6.2). The pressure sense port is a requirement for sensing the over pressure when using a pneumatic purge control unit.

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