RKI Instruments 65-2340RKSS - Manual (Page 13)

65-2340RKSS Toxic Gas Transmitter • 9
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 toxic gas transmitter. It includes daily, monthly, and quarterly
procedures.
Daily
Verify a display reading of 0 ppm at the controller. Investigate significant changes in the
display reading.
Monthly
This procedure describes a test to verify that the toxic gas transmitter responds properly
to the target gas. 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. See Table 3
on page 14 to determine the correct calibration cup and regulator for the required flowrate
for your detector.
WARNING: Failure to use the recommended calibration cup and calibration gas flow
rate will result in an inaccurate reading.
NOTE: Performing a response test on the toxic gas transmitter may cause alarms. Be sure
to put the controller into its calibration mode or disable external alarms before
performing this test.
Preparing for the response test
1. Place the controller into its calibration mode 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 0 ppm, set the zero reading of the transmitter as described
in “Start Up” on page 8, then continue this procedure.
3. Unscrew and remove the junction box cover.
4. Set a voltmeter to read in the millivolt (mV) range.
5. 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.
6. Use the following formula to determine the correct test points output for the test
sample.
Output (mV) = (test sample/fullscale) X 400 + 100
For example, with a test sample of 0.5 ppm and a fullscale setting of 1.00 ppm, the
correct output is 300 mV.
300 (mV) = (.50/1.00) X 400 +100
7. Unscrew the splashguard from the housing cap. Make sure the housing cap remains
screwed firmly onto the housing body.
8. Screw the regulator into the calibration cylinder.