Microprocessor Based Alarm System has a unique delay zone which allows one to come out of the room and lock it before the room is started to be monitored by the control unit. The Alarm System can automatically isolate any defective zone and keep the rest of zone active for monitoring the sensors. The Alarm System is featured with auto reset facility that enables the alarm to stop siren after five minutes and isolate the activated zone. Microprocessor Based Alarm System is designed to consume low power at the time of monitoring.