RKI Instruments 65-2398RK - Manual (Page 14)

10 • 65-2398RK Combustible Gas Transmitter
5. Use the calibration kit sample tubing to connect the regulator to the calibration cup.
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 one minute.
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 15 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. Unscrew the calibration cup from the detector.
NOTE: For convenience, leave the regulator and calibration cup connected by the
sample tubing.
7. Remove the voltmeter leads from the amplifier test points.
8. Reinstall the junction box 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.
Biannually
Calibrate the combustible gas transmitter as described in “Calibration” on page 15 of this
manual.