Extech Instruments IAQ320 User Manual page 11

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Settings Menu
If the ALC 3.0 and 3.1 thresholds are set to the same value, the yellow light
bar action is disabled.
6.5 Temperature Units
Press the '+' button to toggle the ℃/℉ temperature units.
6.6 Beeper Enable/Disable
Press the '+' button to toggle the beeper ON/OFF.
6.7 Pressure Compensation
Use the '+' button to adjust the compensation from 600 to 1100 hPa (default is
1013).
This setting allows you to calibrate the meter at one altitude and use it at a dif-
ferent altitude, with no affect on accuracy.
Note that hPa stands for hecto-pascal which is a unit of pressure equal to one
millibar (1 hPa = 1 mb). The default setting of 1013 represents the pressure at
sea level.
6.8 Automatic CO Baseline Calibration (ABC)
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This process is enabled by default. To disable it, use the '+' button.
When enabled, the meter will record the lowest CO reading over the previous
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7 days and use it as the 400 ppm calibration reference. This reduces long-
term drift, but is not suggested for use in hospitals, green houses, wineries,
and other areas with poor ventilation.
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#NAS100144; r. AC/95652/95652; en-US