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17 Maintenance
The detector has been designed to be virtually maintenance free but the following precautions are recommended:
1)
Visual inspection of the front window
for accumulation of dirt on the outer surface or damage at intervals of
app. 6 months. Clean the surface with a paper tissue and avoid rubbing dirt into the surface. Use the same
precautions as for a camera lens.
2)
Walk tests
for checking the detector alignment and sensitivity settings to ensure optimal performance and
reliability.
3)
Inspection is recommended following extreme conditions
such as snow storms, sand storms, hail etc. to
make sure that nothing has been damaged and the sensitivity is not reduced by accumulation of snow, sand or
dirt on the front window. Snow or dust in front of the window should be removed by hand or by using of a soft
instrument (e.g. a wooden stick).
18 General Comment on the Eagle PIR
•
Despite the advanced design and state-of-the-art features of the PIR it is in the nature of a Passive Infrared
Detector that an absolute detection probability and freedom from nuisance alarms cannot be achieved,
masking of the PIR 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 has 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 less than the nominal range 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 detector.
•
It is therefore strongly recommended to
combine the PIR with alarm verification
such as CCTV or a second
system using other physical means of detection (e.g. VMD).
•
Any liability for direct or indirect damage resulting from the use of the PIR as a detection device is explicitly
disclaimed.
•
The information in this product manual is based on testing of samples taken at random from production and
believed to be representative, E&OE.
Содержание Eagle PIR-100
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