There are many different types of detectors that can be used with an intrusion alarm system. This blog we will concentrate the discussion on the most common type of detectors used with most systems today; door and window contacts, motion detectors, and glassbreaks detectors.
Door and Window Contacts
When using glassbreak sensors to protect an occupied building it is very important you select a glassbreak detector proven for this application. Not all detectors are equal. The wrong detector will provide ongoing alarm issues.
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The glassbreak detectors are typically programmed as a perimeter point; anytime these units sense glass breaking they go into alarm.
Choose your motion detector carefully; quality and reliability do matter. A cheap inexpensive passive infrared detector has a greater likelihood of creating false alarms than does a more expensive dual technology detector.
There are two major classes of motion detectors; the passive infrared detector and the dual technology detector.
The passive infrared looks for a change in heat (infrared) within the field of the detector. The dual technology detector looks for motion (microwave) and heat (infrared) both must be present in order to trigger an alarm condition.
These detectors are designed for a specific coverage pattern. Make sure the coverage pattern is adequate for the area you are trying to cover. Installing a 35’ x 30’ unit in a warehouse is not going to provide much coverage. Installing a 90’x70’ will provide much better coverage. Keep in mind that the coverage pattern is clear line of site. These units cannot provide the coverage if they are blocked.
These units are typically programmed at interior followers or perimeter points. An interior follow will allow for a delay if an entry exit delay is first present otherwise it goes straight into alarm. The perimeter detector goes straight into alarm.
Next blog we will discuss outdoor and environmental detectors.