BD Loops Useful Links

To download BD Loops files please visit our downloads page.

For more information concerning our associations you may visit their web sites by clicking the Links/pictures below.

American Fence Association

View AFA's Code of Ethics

International Municipal Signal Association

View IMSA Web Site

International Door Association

View IDA's Code of Ethics

3/16 (.1875”) Blade dealers

If you are having trouble finding a 3/16” saw-cut blade to use with our saw-cut, please try one of the dealers below.

1. Contractors Direct- Ph#800 709-0002 ask for Richard

2. Precision Diamond inc

3. The Diamondblade Depot

4. RAI Products

BD Loops Size Chart

This is a helpful chart where you can find the proper size of where a loop will fit into your application.

View the BD Loops : Size Chart

To download/print click here: Printable Size Chart

Understanding and

Importance of Proper Loop Phasing

Loop phasing comes into play when two loops are used with the same detector. A common application would be when two reverse loops are used with one on each side of a sliding or vertical gate. Proper phasing is accomplished when the loops are connected in series with each loop current flowing in the same clockwise or counter clockwise direction. . See example below of two loops with the same clockwise direction.

With the current flowing in the same direction in each loop, you will notice that the two loop legs nearest the gate will have currents moving in the opposite directions. This will cause what is referred to as a Field Cancellation Effect. That is, the fields of sensitivity will both have the same magnetic polarity (North or South) toward each other. Since like fields repel, the fields of sensitivity are pushed up and away from each other, causing a dead or null field between the loops. This null or Cancellation effect will allow the loops to be placed closer to the gate without being detected. Because the fields are pushed up, they now are MORE sensitive next to the gate path, making for a safer reversing loop feature.

On the other hand, if the loops are connected with the current flowing in the opposite directions, the poles of each loop will have an opposite polarity, causing the fields to attract to each other. This will cause what is referred to as a Field Enhancement Effect. This will cause the area between the two loops to attract to each other. This effect will increase the sensitivity in the zone where the gate travels, increasing the chance of the gate being detected as it closes. If detected, the reverse detector will keep reversing the operator as the gate tries to close, setting up the requirement to send out a service technician.

BD Loops has phase indictors marking (►►►Phasing direction►►►) printed on the loop wire and Black and Red color-coded lead-in wires that allow the installer to properly phase the loops at the time of installation. This will eliminate the guesswork and reduce the need for repeat service calls for improperly phased loops.

Proper phasing installation of two BD Loops wired in series with one detector

Each BD Loops is pre-phased at the factory. This phasing relationship is clearly marked on every loop. The marking consists of a black mark on one of the loop leads as it exits the loop yoke or ►►► PHASING ARROWS ►►► on the wire itself. By placing both loops with the black phase indicator or arrows flowing in the same clockwise or counter-clockwise direction and wiring the loop lead-in in series as shown below, the loops will be properly phased. This feature takes the guesswork out of installing two reverse loops to one detector for a sliding or vertical gate.