压力开关是工业过程中用于控制压力的电气限位开关。安装在过程工厂中，一旦压力上升或下降超过预先定义的水平，它就会触发调节动作或警报。压力开关以压力传感器的电输出信号的形式接收必要的信息。

　　原文：

　　A pressure switch is an electrical limit switch for controlling pressure in an industrial process. Installed in a process plant, it will trigger a regulating action or an alarm as soon as the pressure rises or falls beyond a previously defined level. The pressure switch receives the necessary information in the form of the electrical output signal of a pressure sensor.