Barometric Pressure

AWI's 7150 Digital Barometer Series, was designed to provide accurate pressure measurements over a wide range of environmental temperatures and pressures.  The fully compensated digital barometer is ideal for use in demanding automated weather station applications and is fully certified by the FAA.

The barometers use pressure transducers with silicon peizoresistive absolute pressure sensors.  The pressure sensors have excellent hysteresis and repeatability characteristics, low temperature dependence, and very good long term stability.  The pressure transducers used in the 7150 series are unparalleled in terms of durability and ruggedness.

Three models are available in the 7150 series, and they vary by the number of transducers that are present.  Additional pressure transducers allow for operational redundancy, and can be used to flag the digital barometer for maintenance or replacement.  All of the barometers in the 7150 series are available with either RS-232 or RS-485 communication.

For additional information and technical specifications, download our product data sheet.

The 11906 Series Digital Barometers are designed to make accurate pressure measurements in a number of environmental conditions.  Using capacitive, absolute pressure sensor technology, the 11906 series achieves excellent hysteresis as well as outstanding long-term stability.  By combining the sensor with AWI's quad-plate pressure port technology, venturi effects by wind speed are minimized contributing to the barometer's exceptional repeatability.  The 11906 series barometers are ideal for high performance applications such as aviation and meteorological studies.

When the pressure changes, the silicon diaphragm bends and changes the height of the vacuum gap in the sensor.  As the vacuum changes the capacitance of the sensor changes, which is measured and converted into a pressure reading.  The pressure sensor combines three powerful elements to obtain its superior performance.  These elements include, the use of single crystal silicon as a sensor material, the capacitive measurement principle, and the air sampling inlet.  Silicon offers great elasticity, low hysteresis, excellent repeatability, small temperature dependence, and superior long-term stability.  The design of the capacitive pressure sensor was maximized for a wide dynamic range and includes a built-in overpressure blocking mechanism.  Pressure sampling is accomplished through the quad-plate pressure port that negates any outside air effects through its unique air inlet design.

The 11906 Series of Digital Barometers continuously compensate for pressure linearity and temperature dependency.  Each barometer is calibrated through a scientifically valid chain of reference.  The traceability chain goes directly from the product up to the National Institute of Standards and Technology (NIST) with an unbroken chain of calibrations.  All barometers come with a factory calibration certificate with is NIST traceable.