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- 两线制压力变送器设计两线制变送器的原理是利用了4~20mA信号为自身提供电能。本文档详细介绍了两线制压力变送器的特点以及参考电路图-2-wire pressure transmitter 2-wire transmitter design principle is the use of the 4 ~ 20mA signal to provide power for itself. This document details the two-wire pressure transmitter f