RKI Instruments 65-2424RK - Manual (Page 12)

8 • 65-2424RK H
2
S Transmitter
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 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 on/off knob counterclockwise to open it. The sample will begin to
flow.
2. Hold the calibration cup against the H
2
S sensor’s face. Leave the rubber boot and
sealing spacer on the sensor when calibrating. Hold the cup on gently to allow gas to
escape and avoid pressurizing the sensor’s sensing face.
3. When the reading on the voltmeter stabilizes, after approximately two minutes, 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
transmitter as described in the Calibration section of this manual.
4. Turn the regulator on/off knob clockwise to close it.
5. Remove the calibration cup from the sensor face.
6. Unscrew the regulator from the calibration cylinder.
7. Remove the voltmeter leads from the test points.
8. Secure the cover to the enclosure.
9. When the display reading falls below the alarm setpoints, return the controller to
normal operation.
Quarterly
Calibrate the H
2
S transmitter as described in the Calibration section of this manual.
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended
action for problems you may encounter with the H
2
S transmitter.
NOTE: This troubleshooting guide describes transmitter problems only. See the
controller operator’s manual for problems you may encounter with the
controller.
Fail Condition
Symptoms
• The controller indicates a fail condition.
Probable causes
• The transmitter wiring is disconnected or misconnected.
• The transmitter’s zero reading is low enough to cause a fail condition.
• The transmitter is malfunctioning.