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.
采用级联型多电平逆变器给异步电机供电，逆变器的开关信号利用载波移相脉宽调制方法生成。
The asynchronous machine is fed by cascaded multilevel inverter, and the inverter switching signals are generated by carrier phaseshifted pulse width modulation method.
GX-1矿用隔爆型拉引信号开关适用于具有煤尘和爆炸性气体的煤矿井下，作为低压开关防爆电铃或其它小型声响设备。
GX-1Exploding isolation type drawing signal switch used for mining is applicable to coal mine where has explosive gas and coal dust.
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