12 • 65-2405RK-04 Combustible Gas Transmitter
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 10, then continue this procedure.
3.
Screw the regulator into the calibration cylinder.
4.
Use the flexible tubing coming from the calibration cup/splash guard to connect the
regulator to the calibration cup.
5.
Unscrew and remove the amplifier junction box’s cover from the junction box.
6.
Set a voltmeter to measure in the millivolt (mV) range.
7.
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.
8.
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
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 the length of time determined in “Determining Response
Time” on page 16.
3.
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 17 of this manual.
4.
Turn the regulator’s on/off knob clockwise to close the regulator.
5.
Unscrew the regulator from the calibration cylinder.
6.
Disconnect the calibration cup/splash guard’s flexible tubing from the regulator.
NOTE:
Do not disconnect the flexible tubing from the calibration cup/splash guard.
7.
Remove the voltmeter leads from the amplifier test points.
8.
Reinstall the amplifier junction box’s cover.
9.
When the controller display reading falls below the alarm setpoints, return the
controller to normal operation.
10. Store the components of the calibration kit in a safe place.
Quarterly
Calibrate the combustible gas transmitter as described in “Calibration” on page 17 of this
manual.
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