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Frequently Asked Questions

Can I power MATRIX loop detectors with 115 VAC?

Yes. BEA provides a 12/24-volt version and a 110-volt version.

Can I use loop detectors for one-way detection?

Yes. The MATRIX D offers one-way detection when in “combined mode.”

Why is one of the detector loop LEDs blinking red?

This is an error indication due to the loop frequency being out of specification. Refer to the User’s Guide to determine the error.

How do I set the loop relay to pulse when a vehicle exits the loop?

Set DIPs 5 and/or 7 to pulse (ON). Set DIPs 6 and/or 8 to pulse on exit (ON).

[relay A = DIPs 5 and 6; relay B = DIPs 7 and 8]

Is the 11-pin plug-in harness included with MATRIX loop detectors?

No. The harness (10MATRIXHARN) is optional. Only the plug-in socket is included.

How do I get the detection loop to detect trailers that sit higher off of the ground?

Turn on ASB (Automatic Signal Boost).

Can one MATRIX work two loops, an entry, and pulse to close?

Yes. The MATRIX II is capable of controlling two loops. Use appropriate DIP switches to configure.

Why is the detection loop having issues detecting vehicle traffic all of the time?

When setting up the loops, make sure to set the sensitivity POT to halfway, then plug the MATRIX back in. This gives you the option to adjust up and down if needed.

What is the size of the detection loop?

It can be any size, up to 108 square feet.
The number of turns will be determined by the area of the loop (see User’s Guide for the correct number of turns).

How many twists should the feeder cable have?

15 twists per yard.

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