RKI Instruments 65-2395RK-CH4 - Manual (Page 12)

8 • 65-2395RK-CH4 Methane Transmitter
8. Allow the gas to flow for one minute.
9. Verify a voltmeter reading of 100 mV (±2 mV).
10. If necessary, use a small flat-blade screwdriver to adjust the zero pot until the
voltmeter reading is 100 mV (±2 mV).
11. Turn the regulator’s on/off knob clockwise to close it.
12. Unscrew the calibration cup from the detector.
13. Unscrew the regulator from the zero air calibration cylinder. For convenience, leave
the sample tubing connected to the regulator and the calibration cup.
14. Store the components of the calibration kit in a safe and convenient place.
15. Remove the voltmeter leads from the test points.
16. Secure the junction box cover to the junction box.
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 %Vol. at the controller. Investigate significant changes in the
display reading.
Monthly
This procedure describes a test to verify that the methane 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 methane 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 %Vol.
If the display reading is not 0 %Vol., set the zero reading of the transmitter as
described in “Start Up” on page 7, then continue this procedure.