Vaisala PMB100 Bedienungsanleitung PDF herunterladen (Seite 5)

CHAPTER 2_______________________________________________________ PRODUCT DESCRIPTION

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CHAPTER 2

PRODUCT DESCRIPTION

The PMB100 for OEM applications is a new circuit board mountable

barometric pressure transducer that is designed to interface with an

AD converter and a microprocessor.

The PMB100 module is characterized over 800 to 1100 hPa (mbar)

pressure range and over –5 to +45C temperature range. It ouputs

pressure dependant voltage within 0 and 2.5 VDC along with a

reference voltage of 2.5 VDC. All pressure and temperature related

coefficients are given in a module specific certificate and also stored

in an incorporated EEPROM, which uses the I

C interface. All the user

needs to do is to measure the temperature of the module and the two

voltage outputs and then calculate the compensated pressure reading

using the coefficients. A final offset correction against a high-class

pressure standard is recommended as a final touch.

BAROCAP

pressure sensor

The PMB100 barometer modules use the BAROCAP

silicon

capacitive absolute pressure sensor. 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.

Thin film metallization

Silicon

Vacuum gap

Silicon

Glass

Silicon diaphragm

Figure 1 The BAROCAP

pressure sensor

The BAROCAP

pressure sensor consists of two layers of single

crystal silicon having a layer of glass between them. The thinner

silicon layer is etched on both sides to create an integrated vacuum

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Vaisala PMB100 Bedienungsanleitung Seite 5