Et system MD2010 Manual

Sensing loop position:

A safety loop should be positioned where the largest amount of metal of the vehicle will be present
when that vehicle is in the path of the moving gate, door or boom pole. Be aware that metal gates,
doors or poles could activate the loop detector if they pass within range of the sensing loop.
A free exit loop should be positioned +/- one and a half car lengths away from the gate, door or
boom pole, on the approach side for traffic exiting.
In cases where more than one loop is installed ensure there is at least 2m between the sensing loops
to prevent cross-talk interference between the loops. (Also see Dip-switch 1 option and number of
turns around the loop below)
Sensing loop dimensions and shape :( Figure 1)
A square or rectangular slot of +/- 4mm should be cut into the road surface 30 – 50mm deep.
The recommended minimum distance between either of the parallel sides is 1m.
Cross cut the corners by 45º to prevent damage to the cable as it passes around the corners.
The feeder slot will need to be wider to allow for the required twisting of the feeder.

Sensing loop wire:

Single length copper "Panel Flex" (Stove wire)
Silicone insulated
Minimum cross section - 1.5mm
Joints in the wire are not recommended. If made they should be soldered and weatherproofed
sufficiently.

Number of turns around the loop:

Loop circumference 7-10m -
Loop circumference >10m -
Loop circumference < 7m -
In cases where 2 loops are adjacent to each other, use 3 turns in one and 4 turns in the other to help
prevent cross-talk interference.

Detector position and installation:

Install the detector in a weatherproof housing.
The detector should be as close to the sensing loop as possible.

Installation summary:

Run the single length of wire from the detector, around the loop 3 times (see "Number of turns of loop" above)
and then back to the detector. The 2 ends running to the loop and returning from the loop of the same length
of cable is known as the feeder and must be twisted together 20 – 30 times per meter. The twisting will shorten
the feeder, so allow excess cable when starting out from the detector and on the return from the loop.
MD2010
METAL LOOP DETECTOR
2.
3 turns
2 turns
4 turns