18 • 35-3001A-04-02 Carbon Monoxide Sample-Draw Detector
3. Verify that the sensor wiring is correct and secure. “Wiring the Sample-Draw Detector to a
Controller” on page 14 describes sensor wiring connections.
4. Calibrate the sample-draw detector as described in “Calibration” on page 24.
5. If the fail condition continues, replace the sensor as described in “Replacing Components of
the Sample-Draw Detector” on page 19.
6. If the fail condition continues, contact RKI Instruments, Inc. for further instruction.
Slow or No Response/Difficult or Unable to Calibrate
Symptoms
•
The sensor responds slowly or does not respond during the monthly response test.
•
Unable to accurately set the zero or response reading during the calibration procedure.
•
The sensor requires frequent calibration.
Probable causes
•
The calibration cylinder is low, out-dated, or defective.
•
If a demand flow regulator calibration kit is used, the demand flow regulator is not functioning
properly.
•
The sample-draw detector’s flow rate is too low because of an obstructed sample line, failed
pump, etc.
•
The sample-draw detector is malfunctioning.
Recommended action
1. Verify that the calibration cylinder contains an adequate supply of a fresh test sample.
2. If a demand flow regulator calibration kit is used, use a different demand flow regulator to
determine if the original one is functioning properly.
3. If necessary, set the correct flow rate with the sensor flow control valve.
4. If you cannot set the correct flow rate, check the sample line for obstructions or kinks.
5. If the calibration/response difficulties continue, replace the sensor as described later in this
section.
6. If the calibration/response difficulties continue, contact RKI Instruments, Inc. for further
instruction.
Unexplained Readings
Symptoms
Controller shows carbon monoxide readings when there is no carbon monoxide present.
Probable causes
The charcoal filter is saturated and is no longer scrubbing out interfering gases.
Recommended action
Replace the charcoal filter.
