Vaisala DPT146 Guide de l'utilisateur télécharger pdf (Page 21)

Chapter 3 _______________________________________________________ Functional Description

VAISALA ________________________________________________________________________ 19

advantage of sensor warming is the rapid response of dewpoint

measurement. A wet sensor and filter would otherwise result in a

dewpoint equal to ambient temperature (that is RH = 100 %).

If in spite of sensor warming the sensor gets soaked, it will recover fully

back to normal operation after it dries out.

NOTE

Sensor warming is not available if the transmitter has been ordered with

-485 only output.

BAROCAP® Technology

The BAROCAP® silicon capacitive absolute pressure sensor was

developed by Vaisala for barometric pressure measurement applications.

The BAROCAP® sensor has excellent hysteresis and repeatability

characteristics, low temperature dependence, and a very good long-term

stability. The ruggedness of the BAROCAP® sensor is outstanding and

the sensor is resistant to mechanical and thermal shocks. The pressure

measurement of the MPS1 multiparameter sensor is based on an

advanced RC oscillator and reference capacitors against which the

capacitive pressure sensor is continuously measured. The microprocessor

of the transmitter performs compensation for pressure linearity and

temperature dependence.

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Vaisala DPT146 Guide de l'utilisateur Page 21