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2.1.3. Hidden Version
The Hidden version is designed for situations where it is necessary that the fence cannot be
identified as security-protected. The detectors are installed inside the posts. Interconnecting cables in
the protector are also led through the posts and underground in between the posts (alternatively on
the foundation wall or the fence frame).
Installation of this solution is more demanding and the Hidden version does not come with
interconnected detectors. The protectors with cables leading from one post to another have to be
prepared prior to the installation. This can be done for new fences during their installation, but can
turn out to be problematic for existing fences.
In some cases, a solution can be used for existing fences where the detectors are placed
inside the poles and the cable is fitted on top of the fence. While the cables are not protected from
potential damage anymore, they are not as noticeable and therefore less conspicuous (depends on
the fence type and installation method).
In order to be able to be placed inside posts of different shapes and diameters, the detection
sensor itself is attached to a sheet metal holder with springs (the so-called "bridge") that ensures its
fixation inside the post. Sometimes it is appropriate to fasten the sensor holder (e.g. using an S-
shaped wire – there is a hole in the holder for this purpose), so that it does not sink deeper inside the
post over time. Additionally, a blind flange has to be used to enclose the hole in the pole so that the
detector is protected from rain.
During installation, the cables are connected using UR2 gel couplings (see 2.1.4 connecting
the line). The cable is secured against pulling out by fixing to the detection sensor holder using a
binding strap at the bottom of the holder (there are two more holes for this purpose). There is a
shaped shim on the other side of the holder which is bent to secure the detector from shifting. The
third hole at the top is used to manipulate the holder inside the pole. We can provide an appropriate
tool with a hook at the end that can be used to manipulate the detector inside the poles.
Detector holder for the Hidden version Connection and securing of hidden detector cable
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