It's a simple device that contains a pressure-sensitive button that sends a signal when it is pressed or released.

这个简单的设备包含了一个压力感知按钮，当我们按下或者释放该按钮时它会发送一个信号。

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This device can transmit signal and control through the medium of compressed gas, and can adjust testing pressure, flow rate and time according to the automatic controlling requirement.

该装置以压缩空气为介质进行信号传递和控制，并能根据需要调节检漏压力、流量和时间。

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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.

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。

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