Vaisala DRYCAP DMT340 SERIES Guia do Utilizador descarregar pdf (Página 131)

Chapter 4 ________________________________________________________________ Operation

VAISALA ______________________________________________________________________ 131

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 DMT340 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 check 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.

0706-014

Figure 70 Following AutoCal on the Display

5. Press EXIT to return to the basic display.

You can also perfom Autocal manually by using the pressure set and

check buttons on the motherboard. By pressing both buttons

simultaneously, Autocal is performed, see Figure 64 on page 102.

Sensor Purge

Sensor Purge is a feature available for the DMT340 M-sensor. The Purge

should be carried out to achieve the shortest response times and the best

long-term stability.

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Vaisala DRYCAP DMT340 SERIES Guia do Utilizador Página 131