Umirs Europe Ltd. Predix
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operating frequency also contributes to the narrow width of the detection zone.
A sample view of the detection zone profile of a 300 m-long segment is shown in
Figure 1.1
.
Figure 1.1
– Sample view of the detection zone profile
SELECTING THE INSTALLATION LOCATION
Attention! The safety and reliability of the operation of the detector depend on the strict
observation of the following requirements.
The presence of water due to overflow/spillage/leakage/seepage/etc. from nearby structures (e.g.,
roofs, etc.) should be avoided in the direct vicinity of the detector units (in the direction of the
emission, no closer than 5 m; perpendicularly to the direction of the emission, no closer than 0.25
m).
The preparation and maintenance of an exclusion zone, where the presence of bushes and
branches of trees, as well as of big, immovable objects (e.g., buildings, etc.) is not allowed, is
necessary. The presence or motion of other movable objects (tractors, people, animals, etc.) is also
not permitted in the exclusion zone. The recommended width of the exclusion zone for various
detector segment lengths is shown below.
The horizontal distance from the detection zone axis to the edge of the exclusion zone must
be:
-
at least 1.2 m for a segment with a length of up to 50 m
-
at least 1.5 m for a segment with a length of from 50-100 m
-
at least 2.0 m for a segment with a length of from 100-200 m
-
at least 2.5 m for a segment with a length of from 200-300 m
-
at least 3.0 m for a segment with a length of from 300-400 m
In the exclusion zone, optimally the maximum height variation between bare ground and
that with snow or long grass cover should not exceed 0.3 m. Note – modified effective use
of the detector is still possible in conditions of greater height variation, e.g., in situations
where it is conceivable that an intruder might attempt to evade detection by using higher
areas of the snow cover itself for concealment of approach. In such cases, it may be
necessary to alter the generally recommended height of installation of the detector units;
however, the
Note
below should always be given due consideration.
