INSTALLATION INSTRUCTION FOR PIR-75
2824-00001
Page
5
9. Installation Tester IT 44
The Installation Tester IT 44 is very useful for alignment and signal check during setting up and routine
maintenance. It will indicate the amplitudes generated by wanted as well as unwanted targets and help
setting the gain control correctly during walk tests and show the magnitude of disturbance signals.
The information displayed on an LCD once the Installation Tester is connected to the detector includes bar
display of signal amplitudes with peak hold feature, instantaneous threshold level as well as alarm time and
count. A separate description is available with more details.
10. 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 damages at
intervals of app. 6 months. To clean the surface use a paper tissue and avoid rubbing dirt into the
surface. Use the same precautions as for a camera lens.
2)
Visual inspection of the inside
for ingress of water is recommended at intervals of 6 to 12 months or
whenever the unit is opened for adjustments or tests. Make sure that the sealing rings are in place
before closing the back cover tightly again.
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 the use of a soft instrument such as a wooden stick.
11. General Comment on the PIR-75
Despite the advanced design and state-of-the-art features of the PIR-75 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-75
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-75 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. 75 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-75.
It is therefore strongly recommended to combine the PIR-75 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-75 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.
