RKI Instruments 65-2422RK-05 User Manual
Page 19
65-2422RK-05 H
2
S Transmitter • 15
6.
Use the following formula to determine the correct test points output for the
calibrating sample.
Output (mV) = (calibrating sample/fullscale) X 400 + 100
For example, with a calibrating 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
Setting the Zero Reading
NOTE
If you can verify that the H
2
S transmitter is in a fresh air environment, you do not
need to apply zero air to the detector before adjusting the zero reading.
1.
Turn the regulator on/off knob counterclockwise to open it. Gas will automatically
begin to flow.
2.
Allow the gas to flow for two minutes.
3.
Verify a reading of 100 mV (± 2mV).
4.
If necessary, use the zero pot on the amplifier to adjust the reading to 100 mV (± 2mV).
5.
Unscrew the regulator from the zero air calibration cylinder.
Leave the sample tubing connected to the regulator and the calibration cup.
Setting the Response Reading
1.
Screw the regulator into the calibration cylinder. Verify that the calibration gas is
representative of the transmitter’s target gas.
2.
Turn the regulator on/off knob counterclockwise to open it.
3.
Allow the gas to flow for two minutes.
4.
Verify that the reading matches the response reading (± 2mV) you determined earlier.
5.
If necessary, use the span pot on the amplifier to adjust the reading to match the
correct response reading.
6.
Turn the regulator on/off knob clockwise to close it.
7.
Unscrew the regulator from the calibration cylinder.
8.
Unscrew the calibration cup from the detector.
NOTE:
For convenience, leave the components of the calibration kit connected by the
sample tubing.
Returning to Normal Operation
1.
Remove the voltmeter leads from the amplifier test points.
2.
Secure the junction box cover to the junction box.
3.
When the display reading falls below the alarm setpoints, return the controller to
normal operation.
4.
Verify that the controller display reading decreases and stabilizes at 0 ppm.
5.
Store the components of the calibration kit in a safe and convenient place.