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| Characteristics of sensors and transmitters (2) |
| 2011-7-25 10:40:57 |
Characteristics of sensors and transmitters (2)
压力变送器也称差变送器，主要由测压元件传感器、模块电路、显示表头、表壳和过程连接件等组成。 1. Pressure transmitter is also called differential transmitter, which is mainly composed of load cell sensor, module circuit, display meter head, case and process connection. It can convert the received pressure signals such as gas and liquid into standard current and voltage signals, and supply them to secondary instruments such as indicator alarm, recorder, and regulator for measurement, instruction and process adjustment.
2. The measurement principle of the pressure transmitter is: the process pressure and the reference pressure are applied to both ends of the integrated silicon pressure sensitive element, and the differential pressure deforms the silicon wafer (the displacement is small, only μm level), so that the silicon wafer A fully dynamic Wheatstone bridge made with semiconductor technology drives an mV-level voltage signal proportional to pressure when driven by an external current source.
由于硅材料的强性极佳，所以输出信号的线性度及变差指标均很高。 3.Since the strength of the silicon material is excellent, the linearity and variation index of the output signal are high. During operation, 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 temperature drift with each other. The amplified signal is converted into a corresponding current signal by voltage-current conversion, and then subjected to non-linear correction, and finally a standard current-voltage signal corresponding to a linear relationship with the input pressure is generated.
压力变送器根据测压范围可分成一般压力变送器（0.001MPa～20MP3）和微差压变送器（0～30kPa）两种。 4. Pressure transmitters can be divided into general pressure transmitters (0.001MPa ～ 20MP3) and differential pressure transmitters (0 ～ 30kPa) according to the pressure measurement range.