RKI Instruments 35-3001A-05-02 User Manual
Page 19
35-3001A-05-02 Carbon Dioxide Sample-Draw Detector • 15
•
The monitoring device is operating properly but indicates a reading well below zero or a
failure alarm.
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 and/or amplifier 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 and amplifier wiring is correct and secure. “Wiring the Carbon
Dioxide Sample-Draw Detector to a Controller” on page 10 describes sensor and amplifier
wiring connections.
4.
Calibrate the sample-draw detector as described in “Calibration” on page 19.
5.
If the fail condition continues, replace the sensor as described in “Replacing the Infrared
Carbon Dioxide Sensor” on page 16.
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.