PIR-045
PASSIVE INFRARED DETECTOR
2800-00006 Page 2 of 10
Tamper Switch
To detect attempts to open the PIR-045, a tamper switch is fitted for the cover. Its contact opens when the cover is opened
and should be connected in series with the normally closed relay contact.
Electronics Supply
Ensure that polarity is correct when connecting power to the electronic circuit. Protective circuitry will withstand a short period
of reversed polarity, but damage will result if this is not corrected quickly.
Field of View
The PIR-045 has a curtain-shaped field of view with differential detection areas and a nominal range of 45 m (150 ft).
Alignment
The detection range of a PIR detector is not limited but a function of size, speed and temperature contrast of a target against
its background. The PIR-045 should be aligned so that the field of view is terminated by a natural or artificial background at
the end of the range.
Vertical alignment is optimal when the upper edge of the field of view is at 1.5 to 2.5 m above ground at the end of the
required detection range provided that the field of view is properly terminated. Setting the overall sensitivity at less than 100 %
does not limit the range but reduce the sensitivity where not needed.
Alignment can be done visually by looking along the grove on the top of the detector. This line of sight corresponds to the
upper edge of the detection pattern.
Where the detection range has to be limited, a terminating screen can be used to avoid detection of targets beyond the
wanted range (see annex 2).
Typical vertical alignment of PIR-045 for a required detection range of 45 m
The PIR-045 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
0
45
1 m
2 m
3 m
4 m
m
1
1.5m
Fig. 1
