22
•
Maintenance
35-3010RKA-04H Sample-Draw Detector Head
Maintenance
This section describes maintenance procedures. It includes preventive maintenance procedures.
This section also includes procedures to troubleshoot the sample-draw detector, replace
components of the sample-draw detector, and adjust the low flow setting.
Preventive Maintenance
This section describes a preventive maintenance schedule to ensure the optimum performance of
the sample-draw detector. It includes daily and quarterly procedures.
Daily
1. Verify that the pilot light is on.
2. Verify that the flowmeter indicates a flow rate of approximately 1.2 SCFH.
If necessary use the bypass valve or flow adjust potentiometer to adjust the flow rate to 1.2
SCFH.
3. Verify a reading of 0% LEL for the hydrogen channel (100 mV at the LEL transmitter test
points) and 20.9% for the oxygen channel (434 mV at the oxygen transmitter test points).
Investigate significant changes in the reading.
Quarterly
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 gas detector.
NOTE:
This troubleshooting guide describes sample-draw detector problems only. See the
instruction manual for the controller if it exhibits any problems.
Fail Condition
Symptoms
• The sample-draw detector’s Fail light is on.
• The controller is operating properly but indicates a reading well below zero on one or
more channels.
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.
