alertor

If the operator is either inattentive or napping, the alertor sounds an alarm.

操作人员精神不集中或打盹儿，就会发声报警。

A device to watch the operator who watches the machine.If the operator is either inattentive or napping, the alertor sounds an alarm.

一种对监视机器作情况的操作人员进行监视的。操作人员精神不集中或打盹儿，就会发声报警。