14 • 65-2331-04 H
2
S Transmitter
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 25 PPM H
2
S and a fullscale setting of
100 PPM, the correct output is 200 mV.
200 (mV) = (25/100) 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 18.
3.
Verify that the reading is within ± 20% of the response reading you determined earlier.
NOTE:
If the readings are not within ± 20% of the correct response reading, calibrate the
affected transmitter(s) as described in the “Calibration” on page 19.
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 adapter/splash guard’s flexible tubing from the regulator.
NOTE:
Do not disconnect the flexible tubing from the calibration adapter/splash guard.
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.
Quarterly
Calibrate the H
2
S transmitter as described in “Calibration” on page 19. See the calibration
frequency discussion in “Calibration Frequency” on page 18 to determine if a quarterly
calibration schedule fits your needs.
