Vaisala DRYCAP DMT346 Betriebsanweisung Seite 104

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User's Guide _______________________________________________________________________
102 __________________________________________________________________ M210762EN-A
0504-049
Figure 47 Following AutoCal on the Display
5. Press EXIT to return to the basic display.
You can also activate Manual AutoCal by pressing both AUTOCAL
buttons on the transmitter motherboard. These are the same buttons as
the pressure set buttons, but when pressed simultaneously, they will
start the AutoCal procedure. See Figure 43 on page 74 for location of
the AUTOCAL/pressure set buttons.
If the AutoCal conditions are not fulfilled, a note appears on the
display informing that the calibration cannot be made.
Sensor Purge
Sensor Purge is available for DMT345 and DMT346. The Purge
should be carried out to achieve the shortest response times and the
best long-term stability.
Sensor Purge is an automatic procedure, in which the sensor is dried.
Thus, the sensor will response very fast when installing the probe
from an ambient to a dry gas. Sensor Purge also corrects the possible
gain drift caused by some chemicals, thus ensuring together with
AutoCal the best measurement accuracy and long-term stability.
As a default, the interval Purge and power-up Purge are turned on
automatically in DMT345 and DMT346. It is recommended not to
turn them off. The automatic sensor Purge can also be started
manually. If enabled, power-up Purge will start always about 10
seconds after reset. If the power is continuously turned on in the
transmitter, the automatic sensor Purge will be performed at an
interval of 24 hours.
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