RKI Instruments 65-2507RK - Manual (Page 12)

8 • 65-2507RK Oxygen Transmitter
15. Remove the voltmeter leads from the test points.
16. Secure the 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 oxygen transmitter. It includes daily, monthly, and quarterly
procedures.
Daily
Verify a display reading of 20.9% oxygen at the controller. Investigate significant changes
in the reading.
Monthly
This procedure describes a test to verify that the oxygen transmitter responds properly to
oxygen deficiency.
NOTE: Performing a response test on the oxygen 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. Verify that the display reading for the channel you are testing is 20.9% oxygen.
If the display reading is not 20.9% oxygen, set the fresh air reading of the transmitter
as described in “Start Up” on page 7 of this manual, then continue this procedure.
2. Set a voltmeter to measure in the millivolt (mV) range.
3. Remove the junction box cover, then plug the voltmeter leads into the test points on
the amplifier. Plug the positive lead into the test point labeled TP+; plug the negative
lead into the test point labeled TP-.
Performing the response test
1. Exhale into the bottom of the oxygen detector housing.
2. Stop exhaling into the bottom of the detector, then verify that the readings on the
voltmeter decreased from the normal reading (434 mV).
NOTE: If the reading does not decrease, calibrate the affected transmitter as described in
“Calibration” on page 12 of this manual.
3. Remove the voltmeter leads from the amplifier test points, then secure the junction
box cover to the junction box.
4. When the display reading rises above the decreasing alarm setpoint, return the
controller to normal operation.
Quarterly
Calibrate the oxygen transmitter as described in “Calibration” on page 12 of this manual.