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4 Field
of
View
The PIR has two curtain-shaped fields of view with independent detection channels for short, medium and long
range detection. The vertical opening angle is app. 26° resulting in an uninterrupted curtain starting at app. 8 m
with the detector mounted at 4.0 m (13 ft) height. The nominal ranges and widths at nominal range refer to the table
below.
5 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 should be aligned so that a natural or artificial background at the end of the
range terminates the field of view.
Vertical alignment is optimal when the upper edge of the field of view is at 1.5 to 2.5 m (5 to 8 ft) above ground at
the end of the required detection range provided that the field of view is properly terminated.
Coarse 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. Accurate fine alignment is easily achieved with the help of
the Universal Telescopic Sight ZA P 03, which can be placed on the of the detector for this purpose.
Where the detection range has to be limited, a terminating screen can be used to avoid detection of targets beyond
the wanted range.
Typical vertical alignment for a required detection up to nominal range.
The PIR 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
Fig. 1
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 by increasing the alarm threshold level and may lead to unwanted alarms.
Top view
Fig. 2
Definition PIR-100 PIR
100H
Nominal Range
120 m (400 feet)
150 m (500 feet)
Width at Nom. Range
2.7 m (9 feet)
3.3 m (11 feet)
Содержание Eagle PIR-100
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