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C7232A,B SENSOR AND CONTROLLER
CALIBRATION
Typically, calibration is unnecessary. No calibration kits are
available. However, if CO
2
chamber using a general gas purge device, the sensor can be
rezeroed:
IMPORTANT
Any CO
present during calibration skews the sensor
2
zero level resulting in incorrect CO
1. Once the sensor stabilizes, use a screwdriver to
connect the two MENU soldering pads.
2. The display should indicate CAL.
3. Execute the zero calibration by connecting the two
ENTER soldering pads.
4. The display should return to providing the measured
CO
level.
2
63-2571—4
gas can be purged from the sensor
level reports.
2
CHECKOUT
Perform a quick test of the unit with the unit powered:
1. Stand close to the unit and breathe air into the sensor.
2. Check the CO
ensure a strong rise.
3. When connected to a damper in a ventilation system,
the controller typically signals an increase in air flow.
6
level registered by the controller to
2
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