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The pressure transmitter is composed of three major categories to provide indications, indications, and adjustments such as indicator alarms, recorders, and conditioners.
The pressure transmitter is used to measure the level, density, and pressure of liquids, gases, or vapors, and then converted to a 4-20 mA signal output.
Differential pressure transmitter, also known as differential pressure transmitter, is mainly composed of load cell sensor, module circuit, display meter, case and process connector. It can convert the received gas, liquid and other pressure difference signals into standard current and voltage signals, and provide secondary instruments such as alarm indicators, recorders, and regulators for measurement, indication and process adjustment.
Differential pressure transmitter measurement principle is: the process pressure and reference pressure acting on the two sides of the integrated silicon pressure sensitive element, the differential pressure deformation of the wafer (displacement is very small, only μm level), so that the use of silicon The fully dynamic Wheatstone bridge made of semiconductor technology outputs an mV-level voltage signal proportional to pressure driven by an external current source. Since the silicon material has excellent strength, the linearity and variation index of the output signal are both high. At work, the pressure transmitter converts the measured physical quantity into a mV-level voltage signal and sends it to a differential amplifier that has a very high amplification and cancels temperature drift. The amplified signal is converted into a corresponding current signal by voltage-current conversion, and then subjected to a non-linear correction. Finally, a standard current-voltage signal having a linear relationship with the input pressure is generated.
Differential pressure transmitters can be divided into two types, general pressure transmitters (0.001MPa to 20MPA) and differential pressure transmitters (0 to 30kPa), depending on the pressure measurement range.
It is understood that with the social progress and economic development, pressure transmitters have been used more and more. What is the working principle of pressure transmitter?