Manual VID-W20L030_1 2008.doc / page 7 (10)
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16.2 Pole Mount Adapter VID-PA
Pole mounting bracket with two strap bands for poles of 4 – 16cm (1.6 – 6.25”) diameter
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 to be carried
out at approximately 6 monthly intervals. Clean the surface with a paper tissue and avoid rubbing dirt into the
surface.
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 remoVID by hand or by using of a soft
instrument.
18 General Comment on the VID-W20L030
•
Despite the advanced design and state-of-the-art features of the VID-W20L030 it is in the nature of a Passive
Infrared Detector that an absolute detection probability and freedom from nuisance alarms cannot be achieVID,
masking of the VID-W20L030 cannot be excluded.
•
Detection is a function of thermal contrast, speed and size of a target crossing the detectors 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 VID-W20L030 has been optimised for the detection of a
human target crossing the field of view in an upright position at speeds in the range of 0.2 … 5.0
meters/second.
•
Detection of slow moving targets at long ranges may become difficult under weak contrast conditions. Limiting
the zone length is strongly recommended to less than the nominal range when human targets moving at the
minimum specified speed need to be detected with a high probability of accuracy.
•
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 VID-W20L030 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 VID-W20L030 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
believes to be representative, E&OE.
