8 • 65-2405RK-05 Combustible Gas Transmitter
Maintenance
This section describes maintenance procedures. It includes preventive maintenance,
troubleshooting, and component replacement procedures.
Preventive Maintenance
This section describes a preventive maintenance schedule to ensure the optimum
performance of the combustible gas transmitter. It includes daily, monthly, and quarterly
procedures.
Daily
Verify a display reading of 0 %LEL at the controller. Investigate significant changes in the
display reading.
Monthly
This procedure describes a test to verify that the combustible gas transmitter responds
properly to the target gas.
WARNING: The controller is not an active gas monitoring device during the response
test procedure.
NOTE:
Performing a response test on the combustible gas transmitter may cause alarms.
Be sure to put the controller into its calibration mode or disable external alarms
before performing this test.
NOTE:
The following procedure assumes the use of a calibration kit which includes a
calibration gas cylinder, a 0.5 LPM fixed flow regulator with an on/off knob, a
calibration cup for the detector, and a length of sample tubing.
Preparing for the response test
1.
Place the controller into its calibration mode or disable external alarms.
2.
Verify that the controller display reading for the channel you are testing is 0 %LEL.
If the display reading is not 0 %LEL, set the zero reading of the transmitter as
described in “Start Up” on page 7, then continue this procedure.
WARNING: Do not remove the junction box cover while the circuits are energized
unless the area is determined to be non-hazardous. Keep the junction box
cover tightly closed during operation.
3.
Unscrew and remove the junction box cover.
4.
Set a voltmeter to read in the millivolt (mV) range.
5.
Plug the voltmeter leads into the test points on the amplifier. Plug the positive lead
into the red (+) test point; plug the negative lead into the black (-) test point.
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