管道中流体流量的测量同工业生产过程中温度、压力、液位等的测量一样,是一个重要的方面。各种测量仪表中,使用最多的是差压变送器。目前,供选用的种类很多,正在生产的有:从简单的液注式和机械式的现场指示计直至气动或电动的各种位移平衡式和力平衡式的变送器。而在电动位移式中用于位移检测的有:电感式、应变片式和电容式变送器。 Measurement of fluid flow in pipes is as important as measurement of temperature, pressure, liquid level, etc. in industrial processes. A variety of measuring instruments, the most used is the differential pressure transmitter. Currently there are a large number of options available and production is underway: ranging from simple liquid and mechanical field gauges to pneumatic or electric displacement and force balance transducers. In the electric displacement for displacement detection are: inductive, strain gauge and capacitive transmitter.