电信号压力表的传感装置是采用远红外对管的开关原理，实现传感控制功能的。
The sensor signals pressure gauge is used far infrared devices on the principle of switching, and control functions of the sensor.
快速树干注射器主要由贮液瓶、压力表、弹簧秤、输液管、注药口、气门嘴、注射针头、开关等几部分组成。
The quick trunk injector comprises a reservoir pressure-meter, a spring balance, a transfusion pipe, a liquid valve, an air pinhead and a switch.
压力表可发出供水压力下限和上限开关信号。
The pressure meters can give the switch signals of up limit pressure and down limit pressure of water supply.
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