The AcuDew is supplied with an AutoCal feature, which allows the calibration
span of the transmitter to be adjusted. The AutoCal feature is controlled by an
adjustable potentiometer located under the weatherproof guard.
Note: The AcuDew must be powered by an AcuTrak or AcuVu or some other
device able to supply 4 to 20mA loop power.
Note: For pressure compensated AcuDew Transmitters (i.e. PPMv ranges)
contact Shaw Moisture Meters for assistance.
9.2 Types of AutoCal
There are 2 different types of AutoCal that can be performed on the AcuDew.
These are: -
1. Method 1 = Ambient AutoCal.
Not available on AcuDews with an upper range (wet-end) above 0°C, 32°F
or 6032ppm(v)
.
2. Method 2 = Known Moisture Level AutoCal.
9.3 Ambient AutoCal – Method 1
Not available on AcuDews with an upper range (wet end) above 0°C, 32°F or
6032ppm(v).
9.3.1 Pre-conditioning the AcuDew for ambient AutoCal
To perform an ambient AutoCal, the AcuDew sensing element needs to be
stable with reference to the ambient moisture levels. To ensure this is the case
it is necessary to remove the AcuDew from its normal location and place in an
ambient location that is not subject to turbulent air flow. Leave the AcuDew
powered up in this location for at least 10 minutes.
ACAL adjusts slope of curve.
Sensor Reading 100%
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