Electro-pneumatic converter is a kind of equipment that converts electrical signal to pneumaticsignal, and is the essential key device in automatic process control system.
电—气转换器是一种完成由电信号到气信号转换的装置，是自动化过程控制系统中不可或缺的关键设备。
2
When a pneumatic transmission system is employed, the measurement signal is converted into pneumaticsignal by the transmitter scaled from 0 to 100 percent of the measured value.
当使用启动传送系统时，测量信号就由变送器将比例为0% ~ 100%的测量值转换成气动信号。
3
Fairchild's Model 21 is an adjustable ratio Pneumatic Relay, whereby the ratio of output pressure to signal pressure is infinitely adjustable.