A device that is designed to respond to a certain change in conditions, such as the opening of a door, movement within a room or rapid rise in heat is known as:
An alarm sensor (also called a detector or initiating device) detects specific changes such as motion, temperature, or opening/closing of entry points. It is the primary component in any detection system and initiates the alarm response.
[References:, , ASIS International, Protection of Assets (POA), Chapter: Intrusion Detection and Alarm Systems, , ASIS PSP Certification Study Manual, Domain 2: Physical Security System Components]
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