12 • 35-3001-05-03 Carbon Dioxide Sample-Draw Detector
3. After approximately one minute, verify that the reading at the controller stabilizes within
± 20% of the concentration of the test sample. If the reading is not within ± 20% of the test
sample, calibrate the sample-draw detector as described in “Calibration” on page 16.
4. Remove the calibration tubing from the inlet fitting, then reconnect the sample tubing to the
inlet fitting.
5. Store the calibration kit in a safe place.
Biannual Calibration
Calibrate the sample-draw detector as described in “Calibration” on page 16.
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 Carbon Dioxide Sample-Draw
Detector to a Controller” on page 8 describes sensor wiring connections.
4. Calibrate the sample-draw detector as described in “Calibration” on page 16.
5. If the fail condition continues, replace the sensor as described in “Replacing the Infrared
Carbon Dioxide Sensor” on page 13.
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
