Functional principle and features
43 | EN
Functional principle and features
General
The FUBW50120 is a passive infrared (PIR) detector with microwave and is designed for indoor
use. It is suitable for use with the Secvest wireless alarm system and wireless extension of the
Terxon LX and Terxon MX.
Passive infrared (PIR)
The detector reacts to temperature changes.
A moving heat-radiating object (such as an intruder) in the monitored area changes the thermal
image seen by the detector.
Microwave
The detector emits microwave radiation and receives the signals that reflect back off objects.
If an object moves, this triggers the “Doppler effect”. The detector analyses this effect.
A moving object (such as an intruder) in the monitored area causes this Doppler effect.
These two detector criteria are combined using an AND gate in this detector. This combination
reduces the frequency of false alarms.
The FUBW50120 has a fan-shaped detection field with a radius of approx. 12 m and aperture
angle of approx. 90°.
If “animal-proofing” is activated:
The FUBW50120 then has a fan-shaped detection field with a radius of approx. 9 m and aperture
angle of approx. 90°. The FUBW50120 now has a lower sensitivity to pets (up to approx. 25 kg).
The sensitivity of the PIR element is lower.
However, this also has an effect on the trigger behaviour in general. The lower sensitivity to pets,
for example, can be explained by lower heat emission. An adult emits more heat than a pet
weighing up to 25 kg.
Thanks to an internal tamper contact, it is not possible to tamper with the housing or for it to be
ripped from a wall.
Despite being “animal-proof up to 25 kg,” animals weighing less than this amount
may occasionally trigger the detector. The danger of false triggering is particularly
high if the animal moves, jumps or flies in the vicinity of the detector.
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