20 • 65-2397RK CO
2
Transmitter
6. Unscrew the regulator from the zero air calibration cylinder.
7. Leave the sample tubing connected to the regulator and the calibration cup.
Setting the Response Reading
1. Screw the regulator into the calibration cylinder. Verify that the calibration gas is representative of
the transmitter’s target gas.
2. Turn the regulator’s on/off knob counterclockwise to open the regulator.
3. Allow the calibration gas to flow for one minute and verify that the reading matches the response
reading (±2 mV) you determined earlier. If necessary, use the span pot on the amplifier to adjust
the reading to match the correct response reading.
4. Turn the regulator’s on/off knob clockwise to close the regulator.
5. Unscrew the regulator from the calibration cylinder.
Returning to Normal Operation
1. Remove the voltmeter leads from the amplifier test points.
2. Unscrew the calibration cup from the detector.
NOTE:
For convenience, leave the regulator and calibration cup connected by the sample tubing.
3. Secure the junction box cover to the junction box.
4. When the controller display reading falls below the alarm setpoints, return the controller to normal
operation.
5. Verify that the controller display reading decreases and stabilizes at a typical background CO
2
level. 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.
6. Store the components of the calibration kit in a safe and convenient place.
