RKI Instruments 65-2442RK - Manual (Page 13)

65-2442RK PPM Hydrogen Transmitter • 9
6. Remove the junction box cover, then 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.
7. 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 1,000 ppm hydrogen and a fullscale setting of 2,000
ppm hydrogen, the correct output is 300 mV.
300 (mV) = (1000/2000) X 400 +100
Performing the response test
1. Screw the regulator into the calibration cylinder.
2. Turn the regulator knob counterclockwise to open the regulator.
3. Allow the gas to flow for one minute.
4. 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.
5. Turn the regulator knob clockwise to close the regulator.
6. Unscrew the regulator from the calibration cylinder.
7. Unscrew the calibration cup from the detector.
NOTE: For convenience, leave the regulator and calibration cup connected by the
humidifier tube.
8. Remove the voltmeter leads from the amplifier test points.
9. Reinstall the junction box cover.
10. When the controller display reading falls below the alarm setpoints, return the
controller to normal operation.
11. Store the components of the calibration kit in a safe place.
Biannual
Calibrate the ppm hydrogen transmitter as described in “Calibration” on page 15.