1535 Relative Humidity Transmitter - Novatech Controls

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!14. ENTER SERVICE Enter the current ‘DAY’ of the month. Altering these DAY values will resetthe ‘RUN TIME’.15. SET RTD COMPENSATIONThis only needs to checked if an RTD is being used on terminals 10 &11.The input terminals number 10 &11 can be used for either an AD590 solidstate temperature sensor or an PT100 RTD temperature sensor.If an RTD temperature sensor is being used, the sensor calibration must bechecked.Measure the voltage between the screw terminals 2 & 9. Enter this valueon the keypad using the Option buttons.The accuracy of RTD sensor can be further improved by compensating forlead resistance. Add 0.01 volts to the value entered here for every 0.1Ω totallead resistance. (typically add 0.04 volts)The calibration should be checked after the installation, by comparing thedisplayed 'REF AIR' temperature with a calibrated temperature indicator.NOTE:The calibration must always be checked when using either the RGC-01 orRGC-02 reference air coolers because they are supplied with an RTDinstalled.NOTE: If an automatic purge or cal period occurs when the transmitter is switched to ‘SET-UP’ or ‘MAINT’ mode, theywill be delayed until run mode is selected. They will initiate immediately the mode selector is switched to ‘RUN’.5.6 D/A CALIBRATIONIf a cold start is performed (Section 2.14) then the D/A section of the transmitter will be automatically calibratedafter a thirty second delay. The D/A section should be manually re-calibrated after the instrument has been switchedon for 30 minutes and stabilised. This is achieved by pressing the ‘AUTO CAL’ button. This button should bepressed annually, or if the reference voltages are altered in ‘MAINT’, 5.5 items 6, 7,8 or 9. An ‘AUTO CAL’ willbe performed in one second after pressing the button. The transmitter outputs will fall to 0 mA for this one secondperiod. If a ‘D/A CAL’ error occurs during normal operation then a hardware fault should be suspected.Page 48NOVATECH HUMIDITY TRANSMITTER
!5.7 BACK-UP BATTERY REPLACEMENTThe back-up battery is contained within the module, plugged into socket IC2. It is rated for an average service life of38 years with power on, and for ten years with the power off. The battery is not re-chargeable and should bereplaced every three years with stored transmitters with power off or every ten years with transmitters which havehad the power on.After replacing the battery, re-enter all maintenance and set-up mode function's.5.8 ELECTRONIC REPAIRSElectronic schematics are included in Appendix 2. It is recommended that service be performed on a change-overcircuit board basis. A fast turn around or replacement service is available from accredited service agents.Other service aids, including a test ROM and input simulator are also available .NOVATECH HUMIDITY TRANSMITTER Page 49
Page 3 and 4: !USING THIS MANUALThe Novatech 1535
Page 5 and 6: !NOVATECH 1535 HIGH TEMPERATURE,PER
Page 7 and 8: !Heater VoltageHead TemperatureRefe
Page 9 and 10: !1.3 PURGE/CALIBRATION PANELSDue to
Page 11 and 12: !1.6 REFERENCE GAS DRIERA cooler is
Page 13 and 14: !FLOWSWITCHSOLENOIDVALVE(NOTE 4)PUM
Page 15 and 16: !1.12 AUTO CALIBRATION CHECKING-PRO
Page 17 and 18: !INSTALLATION &2COMMISSIONINGSECTIO
Page 19 and 20: !Figure 2.2 Probe Heater Safety Int
Page 21 and 22: !2.4 CONNECTING THE PROBE CABLEConn
Page 23 and 24: !2.6 CONNECTING THE REFERENCE GAS (
Page 25 and 26: !2.8 CONNECTING THE ALARMSThe alarm
Page 27 and 28: !2.11 CONNECTING REFERENCE GASA ref
Page 29 and 30: !2.15 REFERENCE GAS FLOW SWITCHEnsu
Page 31 and 32: !2.24 DUST IN THE DRIERThe preferre
Page 33 and 34: !OPERATOR FUNCTIONS (RUN MODE)3.1 D
Page 35 and 36: !3.3.2 SUMMARY OF ALARM RELAYSALARM
Page 37 and 38: !SET-UP MODE SUMMARY4.1 SET-UP MODE
Page 39 and 40: !4. DRIER HEATING Options:TYPE1. In
Page 41 and 42: !13. TIME BETWEEN Set the time betw
Page 43 and 44: !25. PRINTER BAUD RATE Select the c
Page 45 and 46: !TRANSMITTER MAINTENANCE5.1 MAINTEN
Page 47: !10. SET PROBE A new EMF offset mus
Page 51 and 52: !If the probe tests reveal less tha
Page 53 and 54: !APPENDICES1. PROBE EMF TABLES2. CI
Page 55 and 56: !MILLIVOLT TABLE WITH AIR REFERENCE

1535 Relative Humidity Transmitter - Novatech Controls

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