9.3.2 Performing an AutoCal in ambient
Not available on AcuDews with an upper range (wet-end) above 0°C, 32°F or
6032ppm(v).
After allowing the sensing element to stabilize, the following
sequence should be followed:
Locate and remove the large screw from the side of the AcuDew. The screw
is retained by the sealing gasket.
Power down the AcuDew by removing the connector from the top of the
AcuDew.
Re-apply power to the AcuDew.
Within 90 seconds of re-applying power turn the potentiometer clockwise.
This action will start the automatic AutoCal process.
Note: There is no need to turn the potentiometer any further. The process
is fully automatic.
The AutoCal will be completed almost immediately and the upper range
(either -20°C or 0°C) will be displayed depending upon the range of the
AcuDew being verified.
Return the screw covering the potentiometer.
9.4 Known Moisture Level AutoCal – Method 2
Note: The only AutoCal method available to AcuDews with a mA upper range (wet-
end) above 0°C, 32°F or 6032ppm(v).
Pre-conditioning the AcuDew for Known Moisture Level AutoCal
There are 2 types of “Known Moisture Level” AutoCals that can be performed. The
only difference is at the pre-conditioning stage of the AutoCal procedure.
AutoCal against known gas or salt solutions.
AutoCal in normal location.
9.4.1 Pre-conditioning against a known gas or salt solutions
To perform this type of AutoCal, the AcuDew sensing element needs to be stable
with reference to the known gas/salts moisture levels. To ensure this is the case it
is necessary to remove the AcuDew from its normal location and place in known
gas/salts solution. Leave the AcuDew powered up in this location until equilibrium
is achieved.
9.4.2 Performing an AutoCal against a known gas or salt solutions
This type of AutoCal is used when the customer has the ability to correct the
AcuDew calibration against a known gas or salt solutions.
1.
2.
3.
4.
5.
6.
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