What are the main types of pressure transmitter

Pressure transmitter is the most commonly used in the industrial application, a sensor is widely used in water conservancy and hydropower, railway transportation, intelligent buildings, production control, aerospace, military industry, petrochemical, oil, electric power, ships, machine tools, pipe, and many other industries.

pressure transmitter is used to measure the liquid level of liquid, gas or steam, density and pressure, and then the pressure signal into a 4 - 20 madc signal output. Mainly include the capacitance pressure transmitter and diffusion silicon pressure transmitter, ceramic pressure transmitter, strain type pressure transmitter, etc.

1。 Capacitive

when pressure is directly effect on the surface of measuring diaphragm, make diaphragm produces tiny deformation, high precision circuit of measuring diaphragm will this tiny deformation transformation become is proportional to the pressure of the highly linear, and the excitation voltage is proportional to the voltage signal, and then USES the special-purpose chip converts the voltage signal to industry standard 4 - The oma current signal or 1-2 5 v voltage signal.

because of using measuring diaphragm (IC internal include linear and temperature compensation circuit, so it can achieve high precision and high stability, transmitting circuit two wire system using special chip, can guarantee the output 4 - two wire system 2 the oma current signal, convenient field wiring.

2。 Diffusion silicon

the measured medium pressure directly ACTS on the sensor diaphragm ( Stainless steel or ceramic) , make diaphragm micro displacement is proportional to the medium pressure, the sensor's resistance to change, and use electronic circuit to detect the change, and the transformation output of a standard measurement signal corresponding to the pressure.

3。 Ceramic

pressure directly in front of the ceramic membrane surface, make the diaphragm produces tiny deformation, thick film resistors printed on the back of the ceramic diaphragm, connected into a wheatstone bridge, Bridge) , due to the piezoresistive effect of pressure-sensitive resistance, make the bridge produces a highly linear and is proportional to the pressure and the excitation voltage is proportional to the voltage signal.

4. Strain type

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. Resistance strain gauge used mostly metal resistance strain gauge and semiconductor strain gauge

two kinds. Metal resistance strain gauge and filamentous strain gauge and metal foil strain gauge. 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.