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电容式压力变送器的原理
Principle of Capacitive Pressure Transmitter
当压力直接作用在测量膜片的表面，使膜片产生微小的形变，测量膜片上的高精度电路将这个微小的形变变换成为与压力成正比的高度线性、与激励电压也成正比的电压信号，然后采用专用芯片将这个电压信号转换为工业标准的4-20mA电流信号或者1-5V电压信号。
When the pressure acts directly on the surface of the diaphragm, the diaphragm produces tiny deformation. The high-precision circuit on the diaphragm transforms this tiny deformation into a voltage signal which is highly linear to the pressure and proportional to the excitation voltage. Then the voltage signal is converted into an industrial standard 4-20mA current signal or a 1-5V voltage signal using a special chip.