Extech Instruments CO200 User Manual page 6

P4.0: Factory Default Reset
Press the ▲ button in P1.0 three times to access P4.0 where you can reset the meter to its default
settings. Press SET and the meter will access P4.1 with a blinking "No". Press the ▲ to switch the
status to 'Yes' and then press either the SET button to confirm and continue or the ESC button to
abort the process.
Calibration
The meter is calibrated to a 400ppm CO
concern, or after one year of use, return the meter to Extech for calibration or continue below.
ABC (Automatic Baseline CO
ABC (Automatic Baseline Calibration) establishes a baseline calibration to eliminate the zero drift of
the infrared sensor. The ABC function is always "ON" when the meter is powered.
ABC is designed to calibrate the meter at the minimum CO
continuous monitoring (power on). It assumes that the area being tested receives fresh air with a
CO level of approximately 400ppm at some point during the monitoring period. Note that It is not
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suitable to use the CO200 in closed areas with consistently high CO
Manual CO Calibration
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Manual calibration is suggested to be done outdoors on a clear day with good ventilation and fresh
air where the CO
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humidity will affect the CO
CAUTION: Do not calibrate the meter in an atmosphere of unknown CO
calibrate in places crowded with people, pets, plants, or where high CO
such as near ventilation ducts or fireplaces.
Place the meter in the calibration area and switch it on. Press and hold the
SET, ▲, and ▼ buttons simultaneously for > 1 second to enter CO
calibration mode. "400ppm" and "CO
process.
The calibration will require approximately five (5) minutes. When the
calibration is complete, the blinking stops and the meter returns to the normal operating mode.
Press ESC to abort a calibration session (not recommended).
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Calibration)
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level is approximately 400 ppm. Do not calibrate on a rainy day because high
level in air.
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" will blink while the calibration is in
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concentration at the factory. If the accuracy becomes a
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reading detected over 7.5 days of
levels 24 hours a day.
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concentration. Do not
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concentrations may exist
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