Vaisala DRYCAP DMT346 Guide de l'utilisateur télécharger pdf (Page 103)

Chapter 4 _________________________________________________________________ Operation

VAISALA_______________________________________________________________________ 101

The AutoCal is carried out if the following criteria for the

measurement environment are fulfilled:

- Relative humidity must be <10 %.

- Temperature must be 0<T<140 ºC.

- Humidity environment must be stable. The maximum change in the

dewpoint can be 2 ºC in 15 seconds.

NOTE

AutoCal cannot operate if the above conditions are not fulfilled.

If the adjustment in the AutoCal reaches a preset maximum value or if

the AutoCal correction fails, for example, because of unstable

conditions, a new AutoCal will take place later (if the automatic

AutoCal is turned on).

Automatic AutoCal

As a default, the automatic AutoCal in DMT345 and DMT346 is

turned on. In this mode, the calibration takes place automatically if the

dewpoint or temperature changes significantly, typically more than

10 ºC. However, if there are no changes in the conditions, the AutoCal

will take place repeatedly after one hour from the last AutoCal.

Manual AutoCal

To ensure that AutoCal has taken place for obtaining the most

accurate measurement in a very dry environment, you can perform

Autocal manually before measuring as follows:

1. Open the MAIN MENU by pressing any of the ▲▼◄► arrow

buttons.

2. Select Measuring, press the ►arrow button.

3. Select Manual AutoCal, press the ►arrow button.

4. Press START to start AutoCal. If the AutoCal conditions are

not fulfilled, a note appears on the display informing that the

calibration cannot be made.

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Vaisala DRYCAP DMT346 Guide de l'utilisateur Page 103