Information about planning and application
System Manual 2CKA001473B9577
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4
Information about planning and application
4.1
Principles of function / principles of operation
4.1.1
The difference between movement detectors / presence detectors
Both device types are passive infrared detectors. The serve for switching the lighting when
people are present.
Movement detector:
Movement detectors must detect gross movements, e.g., when someone enters or leaves a
room or stairwell. They are usually mounted on a wall.
In terms of technical principle, movement detectors for indoor and outdoor use are the same.
However, movement detectors for outdoor use usually have a different housing, as it has to
withstand the environmental influences there, for example.
Presence detectors:
They are rather intended for indoor use. Since they need to detect small movements, such as
typing on a keyboard, they are clearly more sensitive than movement detectors. In addition to
movement, a presence detector monitors the ambient brightness during the ON phase and can
switch off when the brightness-value threshold is exceeded. They are usually mounted below
the ceiling.
