Vaisala PTU200 Series User's Guide download pdf (Page 7)

CHAPTER 2_______________________________________________________ PRODUCT DESCRIPTION

VAISALA __________________________________________________________________________ 3

CHAPTER 2 PRODUCT DESCRIPTION

The PTU200 transmitter combines three measurement parameters:

pressure, temperature and humidity. The applications of the PTU200

range from calibration laboratory environmental condition monitoring

to laser interferometer active wavelength compensation and GPS

meteorological measurements.

The PTU200 transmitters are available with one or two pressure

transducers. Three different kinds of sensor heads can be used with

PTU200: HMP45A-P, HMP45D and Pt100.

The PTU200 transmitters use a RS232 or RS485 (optional) serial

interface and they are available also with a local display.

In outdoor applications, it is recommended to use the PTU200MIK

mounting kit with the PTU200 transmitters. In addition, a mounting

tripod is available to support the PTU200MIK in temporary field

installations.

Pressure measurement

The PTU200 series transmitters use a BAROCAP

silicon capacitive

absolute sensor developed by Vaisala for barometric pressure

measurement applications. The measurement principle of the PTU200

series digital transmitters is based on an advanced RC oscillator and

three reference capacitors against which the capacitive pressure sensor

and the capacitive temperature compensation sensor are continuously

measured. The microprocessor of the transmitter performs

compensation for pressure linearity and temperature dependence.

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Vaisala PTU200 Series User's Guide Page 7