Volume monitoring

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In alarm systems, volume monitoring is the name for a monitoring principle in which the entire interior of the space to be protected (volume) is monitored for moving people (or animals and objects) by sensors .

In contrast to this, there is the monitoring of the outer skin , in which only the edge area of ​​the room, mostly its entrances (doors, windows), is monitored, but you can move inside without being disturbed.

Typical sensors for monitoring volume are passive infrared - motion detector and active ultrasonic sensors , for a perimeter protection switching contacts and glass breakage detector .

Depending on the design, light barriers can be used for both purposes.