Working principle of pressure transmitter
Release time：2017-01-10 Clicks：2482
Capacitive pressure transmitter
When the pressure acts directly on the surface of the measuring diaphragm, the diaphragm will produce small deformation, high-precision measurement circuit on this tiny patch of deformation converted into a highly linear proportional to the pressure, and the excitation voltage is proportional to the voltage signal, then using a dedicated chip this voltage signal is converted to an industry standard 4-20mA current signal or voltage signal 1-5V.
Due to the use of standardized measuring diaphragm integrated circuit contains an internal linear and temperature compensation circuit, it is possible to achieve high accuracy and stability, transmission circuit using a dedicated two-wire chips, will ensure that the two-wire 4-20mA current signal easy field wiring.
Diffused silicon pressure transmitter
Measured medium pressure directly on the sensor diaphragm on (stainless steel or ceramic), the diaphragm to produce micro-displacement is proportional to the medium pressure, so that the sensor resistance value changes, and electronic circuit detects this change and converting the output of a standard measurement signal corresponding to this pressure.
Ceramics pressure transmitter
Pressure directly on the front surface of the ceramic diaphragm, the diaphragm will produce slight deformation of the piezoresistive effect, thick film resistors printed on the back of the ceramic diaphragm, connected into a Wheatstone bridge (closed Bridge), varistor , so that the bridge to produce a highly linear proportional to the pressure, and the excitation voltage is proportional to the voltage signal.
Strain gauge pressure transmitter
Resistance strain gauge is a strain variation on the DUT to convert electrical signals into a sensitive device. It is a major component of the piezoresistive strain transducer. Resistance strain gauge most widely used metal resistance strain gauge and semiconductor strain gauge two kinds. Metal resistance strain gauges have filamentous strain gauge and metal foil-like strain gauge two kinds. Usually a strain gauge closely bonded by a special adhesive and agents in the produce mechanical strain matrix, when the matrix by the force generating stress, strain gauges can together produce deformation, strain gauge resistance change, so applied to the resistor voltage changes.
