alertor

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

如操作人不打盹儿，本装置就会发声报警。

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进行监视的装置。如操作人不打盹儿，本装置就会发声报警。