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压力仪表按使用目的可分为(1)指示仪表;(2)记录仪表;(3)报警仪表;(4)发讯仪表四类。最近,生产过程的仪表装置,由于集中管理化和自动控制化的广泛应用,发讯仪表也日益发展起来了。初期的发讯仪表是电气式的,它还只是用于局部的小压力的远传指示和调节。为要使整个生产过程成系统的安装仪表装置,有必要将各种生产过程中的参数变换为统一信号。由于具有反馈机构的气动变
Pressure meter according to the purpose of use can be divided into (1) indicating instrument; (2) recording instrument; (3) alarm instrument; (4) send the instrument four categories. Recently, the instrumentation of the production process has been increasingly developed due to the extensive application of centralized management and automatic control. The initial transmitter is electric, it is only used for remote indication and regulation of small local pressure. In order to make the whole production process into a systematic installation of instrumentation, it is necessary to transform the parameters in various production processes into a unified signal. Due to the pneumatic mechanism with feedback mechanism