The working principle of the commonly used differential pressure transmitter

Differential pressure transmitter is a kind of common measuring instruments, are widely used in water conservancy and hydropower, intelligent building, railway transportation, production control, ships, aerospace, oil Wells, military industry, petrochemical, electric power, machine tools, and other fields. Ceramic differential pressure transmitter, pressure resistance type differential pressure transmitters are two types of commonly used products, differential pressure transmitter engineering today is to introduce the working principle of the two kinds of commonly used differential pressure transmitter, hope you can help to you.

1, the working principle of the ceramic differential pressure transmitter

ceramics is no liquid transfer differential pressure transmitter, pressure is directly in front of the ceramic membrane surface, and then make the diaphragm produces tiny deformation, thick film resistors printed on the back of the ceramic diaphragm, connected into a wheatstone bridge, due to the piezoresistive effect of pressure-sensitive resistance, can be compatible and strain thermocouple sensor. With a laser calibration, thermocouple sensor has the very high temperature stability and time stability, thermocouple sensor with temperature compensation 0 ~ 70 ℃, and can direct contact with most of the media.

ceramics is a recognized as wear resistance, high elasticity, resistance to corrosion, shock and vibration of the material. Thermal stability properties of ceramics and its thick film resistance temperature range up to - can make it work 40 ~ 135 ℃, and with high precision, high stability of the measurement. Electrical insulation level & gt; 2 kv, the output signal is strong, long-term stability is good. High characteristics, low price of ceramic thermocouple sensors will be the development direction of differential pressure transmitter.

2, the working principle of the piezoresistive differential pressure transmitter of type

in the decompression resistance type differential pressure transmitter, we first meet resistance strain slice of this element. Resistance strain gauge is a thing to be tested on the strain change into an electrical signal sensitive device. It is a piezoresistive type is one of the main part of strain transducer. Usually will strain gauge through the special adhesive agent and adhesive on the produce mechanical strain matrix, when the matrix stress when the stress changes, the resistance strain gauge also together to produce deformation, which changes the resistance strain gauge, to make the change on the resistance of voltage.

for differential pressure transmitter, it is the main working principle of the measured medium or direct effects on the pressure of thermocouple sensor diaphragm ( Stainless steel or ceramic) , make diaphragm micro displacement is proportional to the medium pressure, make the thermocouple sensor resistance changes, and then with electronic circuit to detect the change, and the transformation output of a standard measurement signal corresponding to the pressure.

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