the difference between pressure transmitter and temperature transmitter
2. Pressure transmitter
Pressure transmitter, also called differential transmitter, is mainly composed of pressure measuring element sensor, module circuit, display meter, watch case and process connection. It can convert the received gas, liquid and other pressure signals into standard current and voltage signals to provide secondary instruments such as indicating alarms, recorders, regulators, etc. for measurement, indication and process adjustment.
The measuring principle of the pressure transmitter is: 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 deform (the displacement is small, only μm level), so that semiconductors are used on the silicon wafer The fully dynamic Wheatstone bridge made by technology outputs a mV-level voltage signal proportional to the pressure under the drive of an external current source. Due to the excellent strength of the silicon material, the linearity and variation index of the output signal are very high. When working, the 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 can offset the temperature drift of each other. The amplified signal is converted into a corresponding current signal by voltage and current conversion, and then non-linear correction is performed to generate a standard current and voltage signal that is linearly corresponding to the input pressure.
