Alpha Moisture Systems SADPmini2 - Calibration; Autocal

SADPmini2 User Manual
26
6 Calibration
Field verifications of the range span may be performed periodically, every two to three
months, to ensure correct operation between laboratory calibrations and correcting for
any deviation. These functions can also be used to verify operation of the instrument if
confirmation of an unexpected result is required.
NOTE
Time and Date must be set prior to calibration because the Time and Date of the
calibration is saved with the calibration data
6.1 AutoCal
The AutoCal facility uses the fact that each sensor is designed and manufactured to give
no further increase in response when it reaches its maximum moisture level. For
example, a SADPmini2 with a full-scale value of 0 °C dewpoint will read 0 °C dewpoint
when exposed to a gas with this moisture concentration and will continue to read 0 °C
dewpoint as the moisture concentration rises above 0 °C dewpoint. The SADPmini2 can
therefore be adjusted to read 0 °C dewpoint on any gas with a moisture concentration
wetter than 0 °C dewpoint, ambient air for instance, thus setting the span to match the
original calibration.
1. Select the Settings icon ① from the Navigation Carousel to display the Settings
screen.
2. Using the navigation keys highlight the CAL settings ②.
3. Select OK ③ to display the Calibration screen. NOTE the AutoCal dialogue ④ box
will be highlighted automatically.
4. Select OK ③ to access the AutoCal function.
5. Extend the Desiccant Head as shown ⑤.
6. Select OK ③.
7. Select OK ③ to start the AutoCal procedure ⑥.
8. The SADPmini will display the AutoCal procedure in progress ⑦ and AutoCal
procedure complete screen ⑧ when finished.
9. Select OK ③.
10. Close the Desiccant Head as shown ⑨.
11. Select BACK (10) twice to return to the Settings Screen.