INSTALLATION INSTRUCTION FOR PIR-75
2824-00001
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Typical vertical alignment for a required detection range of 75 m
The PIR-75 should be aligned vertically so that at least the lower half of a person standing upright at the
maximum required range will be within the field of view (see Fig. 1 below).
Side view
Typical horizontal alignment
Horizontal alignment should be done in a way to avoid unwanted signals being generated by targets
(branches, bushes, fences) likely to be moved by wind (see Fig. 2 below). Movement within the field of view
will reduce the sensitivity of the PIR-75 by increasing the alarm threshold level or may lead to unwanted
alarms.
Top view
The ZA P 03 alignment telescope is a convenient alignment aid giving a high degree of accuracy for initial
installation. It is nevertheless important to verify correct alignment by monitored walk tests across the field
of view.
When walk testing the unit the threshold level will increase as a result of the signal generated by the
target. To make sure that original sensitivity is reached, wait at least for 1 minute between each
crossing or disable the Adaptive Threshold Discriminator (ATD) by closing the switch on the connector
board.
If the Installation Tester IT 44 is used for monitored walk tests, the instantaneous threshold level will be
displayed.
Fig. 1
Fig. 2
