Intelecommunications, the termalarm sensor has the following meanings:
- Incommunications systems, a device that can sense an abnormal condition within thesystem and provide asignal indicating the presence or nature of the abnormality to either a local or remotealarm indicator, and (b) may detect events ranging from a simple contact opening or closure to atime-phased automatic shutdown and restart cycle.
- In a physicalsecurity system, an approved device used to indicate a change in the physical environment of afacility or a part thereof.
- In electronic security systems, a physical device or change/presence of any electronic signal/logic which causes trigger to electronic circuit to perform application specific operation. In electronic alarm systems the use of this trigger event done by such devices is to turn on the alarm or siren producing sound and/or perform a security calling through telephone lines.
Note: Alarm sensors may also be redundant or chained, such as when one alarmsensor is used to protect the housing, cabling, orpower protected by another alarm sensor.
