14 • 35-3001-06H-DIL Hydrogen/Oxygen Sample-Draw Detector
Performing the response test
1. Screw the fixed flow regulator into the hydrogen calibration cylinder.
2. Attach the gas bag tubing to the regulator on the hydrogen calibration cylinder.
NOTE:
A demand flow regulator cannot be used for the response test.
3. Turn the regulator’s on/off knob clockwise to open it. Fill the gas bag.
4. Turn the regulator’s on/off knob counterclockwise to close it.
5. Clamp the gas bag shut and disconnect it from the fixed flow regulator.
6. Connect the sample bag tubing to the end of the inlet line and release the clamp. Gas will begin
to flow.
7. After approximately one minute, verify that the hydrogen 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, LEL Sensor” on
page 19.
8. Remove the gas bag tubing from the inlet line.
9. Store the calibration kit in a safe place.
10. Exhale into the sample-draw detector’s inlet line.
11. Stop exhaling into the sample line, then verify that the oxygen reading at the controller
decreased.
12. If the reading does not decrease, calibrate the sample draw detector as described in
“Calibration, Oxygen Sensor” on page 21.
13. Reconnect the sample tubing to the inlet fitting.
Quarterly Calibration
Calibrate the sample-draw detector as described in “Calibration, LEL Sensor” on page 19 and
“Calibration, Oxygen Sensor” on page 21.
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.
