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GeoZone 'A' Perimeter Security System
Installation Manual
2 Site Survey
2.1 Pre-Installation Checklist
To ensure that the condition of the fence does not compromise the performance of the
GDALPHA, the following checklist should be studied and any necessary repair work
carried out on the fence line prior to commencement of the installation.
1.
Ensure that the fabric of the fence is intact and continuous. Areas which have
suffered corrosion damage, vandalism, vehicle damage, or other deterioration,
must be replaced or repaired.
2.
Ensure that the same fabric type is used throughout each zone. Sections of
different types of fabric will produce different responses, making it difficult to
optimise the system settings.
3.
Ensure that posts are firmly fixed in the ground and that the fence fabric is well
supported and not liable to sag or chafe against the posts in bad weather.
4.
Ensure that there are no overhanging branches of trees in contact with the
fence and that the fence line is generally free from vegetation which can muffle
vibrations caused by intrusion attempts.
5.
Ensure that metalwork fixed to the fence such as signs or outriggers are firmly
fixed and do not vibrate or rattle in bad weather conditions.
6.
Ensure that gates are secured so that they cannot rattle when closed.
In general, any fence movement which can cause metal
to metal contact is a potential source of false alarms.
Efforts should be directed at eliminating,
2.2 Calculating Sensor Length
The length of sensor required for each zone can be calculated as follows:
This example assumes a 150m zone.
Length of zone
Add sensor for posts (5% of A)
7 m per corner =
Double Leaf Gate (4 x Gate width) =
Single Leaf Gate (4 x Gate width) =
Total Sensor Required =
2.3 Electrical Interference
When planning the location of sensor runs, care must be taken to avoid placing the
sensor close to sources of electrical interference, particularly any device which may
produce alternating magnetic fields. Such devices include motors, contactors,
transformers, and power cables carrying large currents.
Normally the sensor will reject such stray interference however, if the interference is
sufficiently strong, false alarms may be produced. Power cables which are steel wire
Page 4
IMPORTANT
as far as possible, all such causes.
150m
10m
A+B+C+D+E
(A)
(B)
(C)
(D)
(E)
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