RKI Instruments 65-2397RK - Manual (Page 13)

65-2397RK CO
2
Transmitter • 9
7. Turn the regulator’s on/off knob counterclockwise to open it. Gas will begin to flow.
8. Allow the gas to flow for one minute.
9. Verify a voltmeter reading of 100 mV (±2 mV).
10. If necessary, use a small flat-blade screwdriver to adjust the zero pot until the
voltmeter reading is 100 mV (±2 mV).
11. Turn the regulator’s on/off knob clockwise to close it.
12. Unscrew the calibration cup from the detector.
13. Unscrew the regulator from the 100% nitrogen 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 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 CO
2
transmitter. It includes daily, monthly, and biannual procedures.
Daily
Verify a display reading at the controller of the background concentration of CO
2
. Typical
background concentrations of CO
2
vary from about 300 to 600 ppm (0.03 to 0.06 %volume)
depending on location. The 0-5,000 ppm and 0-5 %volume detectors will display a reading
in a fresh air environment because they have low ranges. The 0-50 %volume and 0-100%
volume detectors will not display a reading in fresh air because their ranges are too large.
Investigate significant changes in the display reading.
Monthly
This procedure describes a test to verify that the CO
2
transmitter responds properly to the
target gas.
WARNING: The controller is not an active gas monitoring device during the response
test procedure.
NOTE: Performing a response test on the CO
2
transmitter may cause alarms. Be sure to
put the controller into its calibration mode or disable external alarms before
performing this test.
NOTE: The following procedure assumes the use of a calibration kit which includes a
calibration gas cylinder, a 0.5 LPM fixed flow regulator with an on/off knob, a
calibration cup for the detector, and a length of sample tubing.