Alarm circuit with Countup TimerDescription| How it works| circuit with timer
In this variation of the original circuit, a timer is included in the logic. The timer counts up to a set value and after it reaches the set value, it triggers the downstream logic. This kind of timer is often used to prevent "chattering" alarms, where a loose connection or a faulty switching device could cause intermittent and false alarms. Such alarms are referred to as "nuisance" alarms as they distract the operators from true alarms.
See screenshot below showing the timer in the circuit. The timer setting can be changed by modifing the number under "SET".