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.
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.
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.
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