继电器内的浮控开关发动报警信号。
A float operated switch in the relay is used to initiate an alarm signal.
当液位处于高位或低位时，浮球开关动作，发出报警信号。
When the level is high or low the float switch Works and alarms.
当安全锤离开安全锤座时，开关按钮弹起，电路连通，此时发声器发出报警信号。
When the hammer safety leaves the safety hammer holder, the switch button ejects, and the circuit is connected, so the sounder issues an alarming signal.
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