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The Difference Between The Working Principle Of Differential Pressure Transmitter And Pressure Transmitter
Nov 01, 2018

Below we briefly understand the difference between the working principle of the differential pressure transmitter and the pressure transmitter.

Pressure transmitter principle

The pressure transmitter is mainly composed of a load cell sensor (also called a pressure sensor), an amplifying circuit and a supporting structural member. It can convert the physical pressure parameter changes such as gas and liquid measured by the load cell sensor into electrical signals (such as 4~20mA, etc.) to provide indications, alarms, recorders, conditioners and other secondary instruments for display, indication and Adjustment.

Pressure transmitters are 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 transmitters are also called differential pressure transmitters. They are mainly composed of load cell sensors, module circuits, display heads, case and process connectors. It can convert the received gas, liquid and other pressure difference signals into standard current and voltage signals to supply secondary instruments such as alarms, recorders, regulators, etc. for measurement, indication and process adjustment. Differential pressure transmitter principle

The measurement principle of the differential pressure transmitter is that the process pressure and the reference pressure respectively act on the two ends of the integrated silicon pressure sensitive element, and the differential pressure causes the silicon wafer to be deformed (the displacement is small, only μm level), so that the silicon wafer is used. A fully dynamic Wheatstone bridge made of semiconductor technology outputs an mV-level voltage signal proportional to the pressure driven by an external current source. Due to the excellent strength of the silicon material, the linearity and variation index of the output signal are high. In operation, the differential pressure transmitter converts the measured physical quantity into a mV-level voltage signal and sends it to a differential amplifier with a high amplification factor that cancels the temperature drift. The amplified signal is converted into a corresponding current signal by voltage and current conversion, and then subjected to nonlinear correction, and finally a standard current voltage signal linearly corresponding to the input pressure is generated.

The above is the simple difference between the differential pressure transmitter and the pressure transmitter in the working principle.