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Pressure transmitter working principle

Author: Date:2012-10-18 22:49:33
1 Pressure transmitter
Resistance strain gauge is a strain change on the DUT converted into an electrical signal sensitive devices. It is a the piezoresistive strain transmitter major part of the. Application of resistance strain gauge metal resistance strain gages and semiconductor strain gauge two. Metal resistance strain gauges have the filamentous strain gauges and metallic foil-like strain gauge two. Is typically the strain gauge through a special binder close adhesion in the generated mechanical strain on the substrate, the resistance strain gauge with deformed when the base body by the force generating the stress changes, the resistance change of the strain gage, thereby change the voltage applied to the resistor.

2, Ceramic pressure transmitter
Principle corrosion resistant pressure transmitter is not a transfer of the liquid, the pressure acts directly on the front surface of the ceramic diaphragm, causes the diaphragm to produce a slight deformation of the thick film resistors printed on the back surface of the ceramic diaphragm, connected into a Wheatstone bridge (closed bridge), due to the piezoresistive effect of the varistor, so that the bridge to produce a pressure proportional to the height of the linear voltage signal is also proportional to the excitation voltage, a different calibration of a standard signal based on the pressure range of 2.0 / 3.0 / 3.3 mV / V, and strain sensor compatible. Laser calibration, the sensor has high temperature stability and time stability sensor comes with temperature compensation from 0 to 70 ° C, and the vast majority of media and direct contact.
    The ceramic material is a recognized high elasticity, anti-corrosion, anti-abrasion, impact and vibration. -40 To 135 ° C operating temperature range of the thermal stability characteristics of the ceramic and is a thick film resistor can make up, but also having a high-precision measurement and high stability. The degree of electrical insulation> 2kV, the output signal is strong, long-term stability. High features, low price ceramic sensor will be the development direction of the pressure transmitter.

3, Diffused silicon pressure transmitter
 The measured pressure medium acts directly on the sensor diaphragm (stainless or ceramic) so that the diaphragm produces a micro-displacement is proportional to the medium pressure, so that the resistance value of the sensor changes, and the electronic circuit detects this change, and the conversion output is a standard measurement signal corresponding to this pressure.