telecommunication, the term alarm sensor has the following meanings:
1. In communications systems, a device that can sense an abnormal condition within the
systemand provide a signal indicating the presence or nature of the abnormality to either a local or remote alarm indicator, and (b) may detect events ranging from a simple contact opening or closure to a time-phased automatic shutdown and restartcycle.
2. In a physical
securitysystem, an approved device used to indicate a change in the physical environment of a facilityor a part thereof.
"Note:" Alarm sensors may also be redundant or chained, such as when one alarm
sensoris used to protect the housing, cabling, or power protected by another alarm sensor.
Federal Standard 1037Cand from MIL-STD-188
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