仪表设上、下限二位开关型接点装置，在压力达到设定值时发出信号或通断控制电路，供作业系统自动控制或发讯用。
Instruments based on the lower limit of two switch-contact device, the pressure to set a signal or when the value of on-off control circuit for the operating system's automatic control or the use.
利用反射式光电开关的电路的通断来控制报警电路，有灵敏度高、隐蔽性好的特点。
The paper provides us with the idea of using photoelectricity reflective on-off switch to control alarm circuit with the characteristics of high sensitivity and favourable concealment.
固态开关部件采用电力MOSFET做软开关，使得电路通断时，不会出现打火花的现象。
The solid state switch device uses power MOSFET as soft switch, so, the spark doesn't appear when the circuit turn on or turn off.
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