RKI Instruments 35-3001-06-01 - Manual (Page 17)

35-3001-06-01 Combustible Gas/Oxygen Sample-Draw Detector • 13
2. Connect the calibration tubing from the demand flow regulator to the inlet fitting. Gas will
begin to flow.
3. After approximately one minute, verify that the combustible gas 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, IR
LEL Sensor” on page 17.
NOTE: If a combustible gas cylinder with a balance of nitrogen is used, the oxygen reading
should decrease to 0% or very close to 0%. If it does, you do not have to perform the
breathing test in step 6.
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 oxygen reading at the controller
decreased.
8. If the reading does not decrease, calibrate the sample draw detector as described in
“Calibration, Oxygen Sensor” on page 18.
9. Reconnect the sample tubing to the inlet fitting.
Quarterly Calibration
Calibrate the sample-draw detector as described in “Calibration, IR LEL Sensor” on page 17 and
“Calibration, Oxygen Sensor” on page 18.
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 9 describes sensor wiring connections.