INSTALLATION INSTRUCTION FOR PIR-150
Page
6
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13. General Comment on the PIR-150
Despite the advanced design and state-of-the-art features of the PIR-150 it is in the nature of a Passive
Infrared Detection System that an absolute detection probability and freedom from nuisance alarms
cannot be achieved,
masking of the PIR-150
cannot be excluded
.
Detection is a function of thermal contrast, speed and size of a target crossing the field of view. Contrast
conditions can vary significantly in the course of the day and year.
Detection depends also on the sensitivity settings, the exact aiming and the prevailing weather conditions
as well as the nature of the target and background.
The detection pattern and frequency response of the PIR-150 have been optimised for the detection of
human size targets crossing the field of view in an upright position at speeds in the range of 0.2 … 5.0
m/s.
Detection of slow moving targets at long range may become uncertain under weak contrast conditions.
It is strongly recommended to limit the zone length to max. 100 m when human targets moving at the
minimum specified speed need to be detected with high probability.
Animals or crawling people may or may not be detected depending on their size, speed, contrast and
distance from the PIR-150.
It is therefore strongly recommended to combine the PIR-150 with an alarm verification such as CCTV or a
second system using other physical means of detection.
Any liability for direct or indirect damage resulting from the use of the PIR-150 as a detection device are
explicitly disclaimed.
The information in this product manual is based on testing of samples taken at random from production
and believed to be representative.
