Maintenance – RKI Instruments 65-2390RK User Manual
Page 12
8 • 65-2390RK 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 biannual
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 transmitter may cause alarms. Be
sure to put the controller into its calibration program 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 short piece of sample tubing to connect the
regulator to the calibration cup.
Preparing for the response test
1.
Place the controller into its calibration program 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 zero, set the zero reading of the transmitter as described
in “Start Up” on page 7 of this manual, then continue this procedure.
3.
Screw the calibration cup onto the bottom of the combustible detector.
4.
Use the calibration kit sample tubing to connect the regulator to the calibration cup.
5.
Set a voltmeter to measure in the millivolt (mV) range.
6.
Remove the junction box cover, then plug the voltmeter leads into the test points on
the amplifier.
Plug the positive lead into the test point labeled TP+; plug the negative lead into the
test point labeled TP-.