Safety-reversing loops prevent the gate from closing on a vehicle it its path. Vehicle detector
loops are like large metal detectors. They can detect all metal
vehicles including bikes. Loops in gate systems need to be installed
correctly. The loop is one of the most common causes of system failure.
The loop being buried underground, cut into asphalt or concrete
are exposed to extreme conditions. Most common failure is due to
leakage to ground. This occurs when moisture penetrates the insulation
of the wire. Other common failures occur due to bad splices or splices
that are not watertight. An indication that your exit loop has failed
is that the gate won't close. |
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Pre-formed
Direct Burial Loop:
Generally made of non- metallic PVC flex conduit. They come in 4'x6',
4'x8', 4'x10' pre-made sizes. Any size can be made. The loop is
generally buried a few inches below grade. These loops can be placed
in the road bed prior to laying asphalt. Under concrete they are
placed above the rebar or re-mesh before pouring.
More than one loop can be connected to one loop detector. |
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Cut
In Loops:
These loops are cut into existing asphalt or concrete driveways.
Special wire is used that has a high resistance to moisture and
abrasion.
Details: Cut-In Loop Diagram |
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Probe
Style Vehicle Detector:
Sometimes refereed to as "wands". These are installed
beside the driveway buried a few inches below grade. These are used
primarily as exit detectors or signaling device. They are not suitable
as safety-reversing detectors.
The probe is generally good for driveways up to 14' wide.
Details: Probe Diagram |
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.Entrance
Loop Detectors:
Placed in front of gate before the safety loop. Allows any vehicle
to open gate. Used in installations where free access is offered
but the gate should remained closed for keeping animals in or out,
and for appearance. The entrance loop can operate full time or restricted
to certain times of day and week. .
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