RKI Instruments 35-3000RK-LEL - Manual (Page 15)

35-3000RK-LEL Combustilbe Gas Sample-Draw Detector • 15
Fail condition
Symptoms
• The sample-draw detector’s Fail light 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 bypass valve or flow
adjust potentiometer.
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
Combustible Gas Detector to a Controller” on page 10 describes sensor wiring
connections.
4. Calibrate the sample-draw detector as described in “Calibration” on page 18.
5. If the fail condition continues, replace the sensor as described later in this section.
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 if functioning properly.
3. If necessary, set the correct flow rate with the bypass valve or flow adjust
potentiometer.
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.