Controlled-products-systems-group AOMSW300DC User Manual download pdf (Page 16)

GENERAL LOOP INSTALLATION GUIDELINES

The following loop installation guidelines are for installing typical driveway loops for access

control applications (i.e. parking gates, sliding gates, swing gates etc...) Always consult with

loop detector manufacturers for specific equipment guidelines. This will confirm that the

proper configuration and installation techniques are applied for your application.

Useful information about inductive loops:

A. The typical sensing height is 2/3 of the shortest leg of loop (in feet)

Therefore a 4’ x 8’ loop typically has a detection height of 2.6’.

B. The inductance of a conventional four-slide loop can be estimated

using the formula:

L = P x (T + T) / 4 Where L = Loop Inductance in microHenries

P = Loop Perimeter in feet

T = Number of turns of wire in saw slot

Therefore a 4’ x 8’ loop with 3 turns would be:

L=(4 + 8 + 4 + 8) x (3 + 3) / 4

L=24 x (9 + 3) / 4

L=24 x 12 / 4

L=24 x 3

L=72 microHenries

}

2’’

1/4’’

Saw Slot

Loop Wire: 3 Turns

Backer Rod

Sealant: 3/4’’ to 1’’ Min.

Driveway

Loop

Perimeter

# of

Turns

6’ - 12’ 6

13’ - 20’ 5

21’ - 60’ 4

61’ - 240’’ 3

241 & Up 2

Driveway loop

1/4’’ Feeder Slot

TWISTED 6

TURNS

PER FOOT

Angles

Suggested guidelines for loop

installation:

Loop wires should be twisted 6 turns

per foot, and twisted from saw slot to

the detector. If possible start twisting

the wires from the edge of the loop.

All 90 degree corners should be

chamfered so that the course of the

wire does not change direction

sharply but rather at shallower angles

of 45 degrees or less. Core drilling of

the corners achieves the same effect

but can still lead to failure due to

sharp edges remaining in the corner

area.

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Controlled-products-systems-group AOMSW300DC User Manual Page 16

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