RKI Instruments 35-3001A-13-XX, Operator'S Manual

Page: 19 / 29

35-3001A-13-XX CO
2
/CO Sample-Draw Detector • 19
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended action for problems you
may encounter with the sample-draw detector.
NOTE: This troubleshooting guide describes sample-draw detector problems only. See the controller
Operator’s Manual if the controller exhibits any problems.
Fail Condition
Symptoms
• The sample-draw detector’s Fail LED is on.
• The monitoring device is operating properly but indicates a reading well below zero.
Probable causes
• 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.
• The sensor wiring is disconnected or misconnected.
Recommended action
1. At the sample-draw detector, set the correct flow rate with the sensor flow control valve.
2. If you cannot set the correct flow rate, check the sample lines for obstructions or kinks.
3. Verify that the sensor wiring is correct and secure. “Wiring the Sample-Draw Detector to a Controller” on
page 15 describes sensor wiring connections.
4. Calibrate the sample-draw detector as described in “Calibration, IR CO
2
Sensor” on page 25 and
“Calibration, CO Sensor” on page 26.
5. If the fail condition continues, replace the sensor(s) as described in “Replacing Components of the Sample-
Draw Detector” on page 20.
6. If the fail condition continues, contact RKI Instruments, Inc. for further instruction.
Slow or No Response/Difficult or Unable to Calibrate
Symptoms
• 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.