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| New door alarm product from Dortronics Dortronics Systems introduced new low-cost 7281-EA Door Prop and Exit Alarm door alarm product. This versatile new unit can activate a local alarm with the built-in sounder and signal an independent system with a relay output if the door has not been closed within the allotted time. As an alarm timer, the 7281-EA can be configured to monitor emergency exit doors, providing an immediate alarm whenever the door is opened - even if the door is immediately re-closed. Additionally, the built-in timer is field adjustable, providing a delay time from 2 to 60 seconds. The time delay will begin upon restoration of the trigger input to normal state. Featuring a unique design to protect the timing circuit against voltage spikes and surges, the #7281-EA units will operate on 12 or 24 volts DC, requiring only 0.05 amps. Equipped with an adjustable time delay period and automatic or manual alarm reset, it is available in brushed stainless steel or a painted beige finish. write your comments about the article :: © 2007 Construction News :: home page |