65-2405RK-05 Combustible Gas Transmitter • 9
6.
Use the following formula to determine the correct test points output for the test
sample.
Output (mV) = (calibrating sample/fullscale) X 400 + 100
For example, with a test sample of 50 %LEL and a fullscale setting of 100 %LEL, the
correct output is 300 mV.
300 (mV) = (50/100) X 400 +100
7.
Screw the calibration cup onto the bottom of the detector.
8.
Screw the regulator into the calibration cylinder.
9.
Use the calibration kit sample tubing to connect the regulator to the calibration cup.
Performing the response test
1.
Turn the regulator’s on/off knob counterclockwise to open the regulator. Gas will
begin to flow.
2.
Allow the gas to flow for one minute, then verify that the reading is within ± 20% of
the response reading you determined earlier.
NOTE:
If the reading is not within ± 20% of the correct response reading, calibrate the
transmitter as described in “Calibration” on page 13 of this manual.
3.
Turn the regulator’s on/off knob clockwise to close the regulator.
4.
Unscrew the regulator from the calibration cylinder.
5.
Unscrew the calibration cup from the detector.
6.
Remove the voltmeter leads from the amplifier test points.
7.
Reinstall the junction box cover.
8.
When the controller display reading falls below the alarm setpoints, return the
controller to normal operation.
9.
Store the components of the calibration kit in a safe place.
Quarterly
Calibrate the combustible gas transmitter as described in “Calibration” on page 13 of this
manual. See the calibration frequency discussion in “Calibration Frequency” on page 12 to
determine if a quarterly calibration schedule fits your needs.
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended
action for problems you may encounter with the combustible gas transmitter.
NOTE:
This troubleshooting guide describes transmitter problems only. See the
controller operator’s manual for problems you may encounter with the
controller.
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