Vaisala INTERCAP HMDW80 SERIES Especificações descarregar pdf (Página 150)

148

Pressure

/ TECHNOLOGY DESCRIPTION

Vaisala BAROCAP® Sensor for Measuring

Pressure

BAROCAP in Brief

▪

Over 25 years of accurate

pressure measurement

▪

Silicon-based capacitive

sensor for absolute pressure

measurement

▪

Barometric pressure range

500...1100 hPa

▪

50...1100 hPa pressure range

available for industrial

applications

▪

Process pressure measurement

range 1...10 bar

▪

NIST-traceable pressure

measurement

BAROCAP’s Unique Benefits

▪

Low hysteresis, high

repeatability

▪

Superior long-term stability

▪

Tolerates harsh conditions

First introduced in 1985, Vaisala BAROCAP

is a silicon-based micromechanical pressure sensor

that offers reliable performance in a wide variety of applications, from meteorology to industrial

measurements. Combining two powerful technologies – single-crystal silicon material and

capacitive measurement – BAROCAP sensors feature low hysteresis combined with excellent

accuracy and long-term stability.

How It Works

BAROCAP is a micromechanical

sensor that uses dimensional changes

in its silicon membrane to measure

pressure. As the surrounding

pressure increases or decreases, the

membrane bends, thereby increasing

or decreasing the height of the

vacuum gap inside the sensor. The

opposite sides of the vacuum gap act

as electrodes, and as the distance

between the two electrodes changes,

the sensor capacitance changes.

The capacitance is measured and

converted into a pressure reading.

The BAROCAP sensor’s properties

– good elasticity, low hysteresis,

excellent repeatability, low

temperature dependence, and

superior long-term stability – are

the result of its single-crystal silicon

material. The capacitive structure

gives the sensor its wide dynamic

range and provides a built-in

mechanism for overpressure blocking.

Typical Applications for

Barometric Pressure

Measurement

Barometric pressure measurement

has a wide variety of applications

within meteorology. Pressure data is

required for estimating the amount

of precipitable water vapor in the

atmosphere. Typical applications

include weather stations, data buoys,

GPS meteorology, and environmental

data logging. Barometric pressure

measurement is also used in hydrology

and agrology applications.

Barometric pressure data is also

required in several industrial

applications. It is measured in pressure-

sensitive industrial equipment, such as

laser interferometers and lithography

systems, aviation applications, and

in exhaust-gas analysis. Metrological

applications include laboratory

pressure standard measurements

and environmental monitoring in

calibration laboratories.

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