Extech Instruments CO230 User Manual page 8

P4.0 AUTOMATIC BASELINE CALIBRATION (ABC) ON/OFF
ABC (Automatic Baseline Calibration) is used to implement a
baseline CO
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the next section (Calibration) for instructions on performing the
calibration. The ABC function defaults to the ON state. To disable
this feature: press ▲/DP WB while in P3.0 mode (or MXN/AVG/▼
when in P1.0 mode) to access the P4.0 settings. Press SET to enter
P4.1. The screen will flash "en" in the lower display. To disable the
ABC function press ▲/DP WB or MXN/AVG/▼ until "dis" is
displayed on the LCD. Press SET to save the settings or CAL/ESC to
exit without saving and return to P4.0.
Calibration
CO CALIBRATION
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The meter is factory calibrated to a 400ppm CO
concentration.
NOTE: The meter should be returned to Extech for calibration once
per year or whenever the accuracy of the meter is in question.
CAUTION: Do not calibrate the meter in an atmosphere of unknown
CO concentration.
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There are 2 options for calibration; Automatic Baseline Calibration
and Manual Calibration; see below
AUTOMATIC CO
Automatic Baseline Calibration (ABC) will calibrate the meter at the
minimum CO
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monitoring. The ABC default is ON. To disable the ABC function,
please refer to the P4.0 Setup mode section above. Perform the
calibration in a well ventilated area with a CO
calibration to eliminate the zero drift of the sensor. See
BASELINE CALIBRATION (ABC)
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reading detected during 7 days of continuous
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level near 400ppm.
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8
standard
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