RKI Instruments 65-2330RK User Manual
Page 13
65-2330RK H
2
S Transmitter • 9
Daily
Verify a display reading of 0 ppm H
2
S at the controller. Investigate significant changes in
the display reading.
Monthly
This procedure describes a test to verify that the H
2
S transmitter responds properly to
hydrogen sulfide. It describes the test using a calibration kit that includes a calibration
cup, calibration gas, sample tubing, and a fixed flow regulator with an on/off knob.
NOTE:
Performing a response test on the H
2
S transmitter may cause alarms. Be sure to
put the controller into its calibration program or disable external alarms before
performing this test.
Preparing for the response test
1.
Place the controller into its calibration program or disable external alarms.
2.
Verify that the controller display reading for the channel you are testing is 0 ppm.
If the display reading is not zero, set the zero reading of the transmitter as described
in the Start Up section of this manual, then continue this procedure.
3.
Unscrew and remove the junction box cover.
4.
Set a voltmeter to read in the millivolt (mV) range.
5.
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.
6.
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
7.
Screw the regulator into the calibration cylinder.
8.
Use the sample tubing to connect the regulator to the calibration cup.
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 two minutes, then 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 “Calibration” on page 13.
3.
Turn the regulator’s on/off knob clockwise to close the regulator.
4.
Unscrew the regulator from the calibration cylinder.
5.
Unscrew the calibration cup from the H
2
S detector.
6.
Remove the voltmeter leads from the amplifier test points.