The curtains are fitted to the pan and tilt module as
indicated in fig 8. Each section of the detectors lens gives
a coverage pattern of around 10 degrees.
When mounting higher than boundary fences rotate the
module and mask off any beams, vertically or horizontally,
that fall outside the area being covered. Use portions of
the self-adhesive silver mask applied to the rear, smooth
side, of the lens. Always replace the lens the correct way
up to ensure exact beam pattern coverage (the top of the
Fresnel lens is marked - TOP). See fig 9.
When mounted at heights above 3 metres there could be
a significant reduction in the range of detection and the
target will have to move a greater distance within the field
of view before an alarm is generated.
STAGE 2 - Connecting the Unit
STAGE 3 - Multibeam Alignment & Masking
The GJD multifunction lens fitted to the
D-TECT
detector
produces 7 long range beams and 7 medium to short
range curtain beams. Movement across the beams
produces the best response and range for the PIRs,
whilst movement towards the detector produces the best
response for the microwave sensor. The unit detects
the changes in heat and movement in the beam pattern,
therefore items such as trees, shrubs, ponds, boiler flues
and animals should be considered when positioning the
detector.
The detector module is fitted with two sliding shutters to
reduce the detection angle. An additional set of curtains
is provided should the beam pattern need to be narrowed
even further e.g. if the minimum detection angle of 10
degrees is required.
A/M
ALARM/NC TAMPER ALARM/NO
+ -
9-15 VDC
Beam Pattern
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