12 • Sample Draw Combustible Gas Detector
8. When the bag is full, unscrew the fixed flow regulator form the cylinder.
9. Close the clamp, then disconnect the sample tubing from the fixed flow regulator.
Performing the response test
1. Connect the calibration tubing from the gas collection bag to the inlet line at or near
the INLET fitting.
The sample draw detector’s pump automatically begins pulling the test sample from
the gas collection bag when you connect the tubing to the inlet line.
2. After approximately one minute, verify that the reading at the monitoring device
stabilizes within
±
10% of the concentration of the test sample. If the reading is not
within
±
10% of the test sample, calibrate the sample draw detector as described in the
Calibration section of this manual.
3. Remove the calibration tubing from the inlet line, then reconnect the inlet line.
Quarterly
Calibrate the sample draw detector as described in the “Calibration” section on page 16.
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended
action for problems you may encounter with the sample draw combustible gas detector.
NOTE:
This troubleshooting guide describes sample draw detector problems only. See
the instruction manual for monitoring device if it exhibits any problems.
Fail condition
Symptoms
•
The sample draw detector’s Fail light is on.
•
The monitoring device is indicating a reading well below zero.
•
The monitoring device is indicating a Fail condition.
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 or transmitter 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 detector and transmitter wiring are correct and secure. The Installation
section on page 7 describes detector wiring connections.
4. Calibrate the sample draw detector as described in the Calibration section on page 16.
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.
