RKI Instruments 35-3000RK-LEL/O - Manual (Page 16)

12 • 35-3000RK-LEL/O Sample-Draw Detector
Performing the response test
1. Screw the demand flow regulator into the combustible gas calibration cylinder.
2. Connect the calibration tubing from the regulator to the INLET fitting. Gas will begin
to flow.
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 the Calibration
section.
4. Remove the calibration tubing from the INLET fitting.
5. Store the calibration kit in a safe place.
6. Exhale into the sample-draw detector’s INLET fitting.
7. Stop exhaling into the sample line, then verify that the readings at the controller
decreased.
8. If the reading does not decrease, calibrate the sample draw detector as described in
the Calibration section.
9. Reconnect the incoming sample line to the INLET fitting.
Quarterly Calibration
Calibrate the sample-draw detector as described in the Calibration section.
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 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 Detector
to a Controller” on page 8 describes sensor wiring connections.
4. Calibrate the sample-draw detector as described in the Calibration section.
5. If the fail condition continues, replace the sensors as described later in this section.