RKI Instruments 65-2434RK - Manual (Page 11)

65-2434RK CO Transmitter • 7
10. If necessary, use a flat-blade screwdriver to adjust the zero pot until the voltmeter
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 CO transmitter. It includes daily, monthly, and quarterly procedures.
Daily
Verify a display reading of 0 PPM CO at the controller. Investigate significant changes in
the display reading.
Monthly
This procedure describes a test to verify that the CO transmitter responds properly to
carbon monoxide.
NOTE: Performing a response test on the CO 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. Assemble the calibration kit as described in the Calibration section of this manual.
4. Set a voltmeter to measure in the millivolt (mV) range.
5. 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-.
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 50 PPM CO and a fullscale setting of