RKI Instruments 65-2424RK - Manual (Page 11)

65-2424RK H
2
S Transmitter • 7
reading is 100 mV (±2 mV).
11. Turn the regulator on/off knob clockwise to close it.
12. Remove the calibration cup from the sensor face.
13. Unscrew the regulator from the zero air calibration cylinder. For convenience, leave
the sample tubing connected to the regulator and the calibration cup.
14. Store the components of the calibration kit in a safe and convenient place.
15. Remove the voltmeter leads from the test points.
16. Secure the cover to the enclosure.
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 a calibration
cup, calibration gas, sample tubing, and a fixed flow regulator with an on/off knob. RKI
Instruments, Inc. recommends using a 0.5 LPM (liters per minute) fixed flow regulator.
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.
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. Screw the regulator into the calibration cylinder.
4. Use the sample tubing to connect the regulator to the calibration cup.
5. Set a voltmeter to measure in the millivolt (mV) range.
6. Remove the enclosure cover, then plug the voltmeter leads into the test points on the
amplifier PCB.
Plug the positive lead into the test point labeled CAL+; plug the negative lead into the
test point labeled CAL-.