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Chapter 4 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 63
CHAPTER 4
OPERATION
This chapter contains information that is needed to operate this product.
Getting Started
Within a few seconds after power-up the led on the cover of the
transmitter is lit continuously indicating normal operation. When the
transmitter is turned on the first time, the language selection window
opens: Select the language with ▲▼ arrow buttons and press the
SELECT button (the left-hand button).
The pressure has an effect on humidity calculations and accuracy.
Therefore, accurate calculations can be achieved only when the ambient
pressure is taken into consideration. See section Pressure Compensation
Setting on page 92 for instructions on how to set the pressure.
Start-up time for DMT345/346 transmitter is in total about 6 minutes.
The outputs (serial and analog) are activated 3 seconds after powering up
the transmitter. In addition, 10 seconds after the measurement the outputs
will freeze for about 6 minutes due to the sensor self diagnostics
procedure (Sensor Purge and AutoCal). The frozen output value will be
the value the transmitter reached during the 10 seconds of measurement.
After the self diagnostics procedure the outputs are operational again.
Display/Keypad
Basic Display
Display shows you the measurement values of the selected quantities in
the selected units. You can select 1 ... 3 quantities for the numerical
basic display (see section Changing Quantities and Units on page 89).
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