ABB 9438 User Manual
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Contents
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36APPENDIX B – CALIBRATION DIAGNOSTICSCal PulseExpose to Air Recovery PeriodTimeOutput Current (%)501000Mark(30 s to 5 min)Expose to AirOutput Current (%)50100Space(30 s to 5 min)0TimeFig. B.1 During CalibrationFig. B.2 Low Sensor EfficiencyThe transmitter can be configured to enable the current output signal to indicate certain calibration diagnostic information.If the option for diagnostics is selected within the Set Up Retransmission scrolls, then the current output will indicate when acalibration is taking place, and also will indicate if the sensor is giving Low Sensor Efficiency.B.1 During CalibrationThe current output value will be maintained during a calibration, but the output will pulse from the maintained value to 0%, dependingupon a programmable Cal Pulse period.The Calibration Pulse period can be programmed 15, 30, 45 seconds, 1, 2, 3, 4, 5 minutes.This will continue for the full duration of the calibration, exposing the sensor to air, and the recovery period.At the end of the recovery period, if the response is good, the instrument will go back on line and the current output will become live.B.2 Low Sensor EfficiencyIf the output from a sensor is found to be below a predetermined level during a calibration (i.e. Low Sensor Efficiency) the calibrationwill not be accepted. The current output immediately goes above the full scale value, and will continue to pulse on a programmableMark/Space basis.The time for the Mark and Space periods can be programmed separately to 30 seconds, 1, 2, 3…..10 minutes. |
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