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Barometric pressure sensor

Introduction

This is a thermal conductivity barometric pressure sensor that uses a highly sensitive thin-film thermistor, and detects atmospheric pressure by detecting differences in thermal conductivity due to atmospheric pressure differences.
Thermal conductivity barometric pressure sensors exhibit output changes when the thermal conductivity of the ambient atmosphere differs from atmospheric pressure. The output signal shows linearity with respect to the atmospheric pressure of the measurement environment, and can measure pressures from 0.15 Pa vacuum to 100 kPa atmospheric pressure, and even 350 kPa pressurized air.
Thermal conductivity sensors using thermistors are temperature- and humidity-dependent, so the actual circuit design must take these characteristics into account when making temperature and humidity corrections.

Appearance of barometric pressure sensor (reference shape)

Features

– Uses highly sensitive and responsive thin-film thermistors (1005M t=0.1mm)
(High precision achieved by high-precision pairing of thin-film thermistors)
– Low power consumption is achieved by keeping the heating temperature at or below 50℃ (atmospheric pressure environment)
– Continuous measurement is possible, enabling constant monitoring of atmospheric pressure

Measurement circuit (for vacuum)

Example of barometric pressure sensor characteristics

– Barometric pressure sensor: Example of output characteristics of pressure detection

Diagram of relationship between pressure and output voltage

It is possible to measure atmospheric pressure over a wide range.

 

– Barometric pressure sensor: Temperature dependence of output characteristics

Temperature characteristics chart for barometric pressure sensor

The output of the barometric pressure sensor is temperature dependent.

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