65-2331-04 H
2
S Transmitter • 13
12. Unscrew the regulator from the zero air calibration cylinder.
13. Store the components of the calibration kit in a safe and convenient place.
14. Remove the voltmeter leads from the test points.
15. Secure the amplifier junction box cover to the junction box.
Maintenance
This section describes maintenance procedures. It includes preventive maintenance,
troubleshooting, and component replacement procedures.
Preventive Maintenance
This section describes a preventive maintenance schedule to ensure the optimum
performance of the H
2
S transmitter. It includes daily, monthly, and quarterly procedures.
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 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.
WARNING: Do not remove the detector housing cap or either of the junction box covers
while the circuits are energized unless the area is determined to be non-
hazardous. Keep the detector housing cap and junction box covers tightly
closed during operation.
3.
Screw the regulator into the calibration cylinder.
4.
Use the flexible tubing coming from the calibration adapter/splash guard to connect
the regulator to the calibration cup.
5.
Unscrew and remove the amplifier junction box’s cover from the junction box.
6.
Set a voltmeter to read in the millivolt (mV) range.
7.
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.
