28 • 35-3001A-10 Oxygen/Carbon Monoxide Sample-Draw Detector
4. When the reading on the voltmeter stabilizes, verify that the reading matches the response reading
(±2 mV) you determined earlier.
5. If necessary, use the span potentiometer on the amplifier to adjust the reading to match the correct
response reading.
6. Disconnect the sample tubing from the inlet line.
7. Unscrew the regulator from the CO calibration cylinder.
Returning to Normal Operation
1. Wait approximately one minute to allow the CO reading to stabilize.
2. Remove the voltmeter leads from the amplifier test points.
3. Close the housing door.
4. Follow the instructions in the controller’s operator’s manual to exit the calibration mode.
5. Store the components of the calibration kit in a safe and convenient place.
