Vaisala DRYCAP DMT346 Guia do Utilizador descarregar pdf (Página 55)

Chapter 4 _________________________________________________________________ Operation

VAISALA________________________________________________________________________ 53

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 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 73 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.

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Vaisala DRYCAP DMT346 Guia do Utilizador Página 55