65-2397RK CO
2
Transmitter • 13
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 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, 0-9,000 ppm, and 0-5% volume detectors will display a reading in a fresh
air environment because they have low ranges. The 0-20% volume, 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.
Biannually
Calibrate the CO
2
transmitter as described in “Calibration” on page 19 of this manual.
