Instructions for the basic operation of the OVER-HEIGHT VEHICLE DETECTOR™ 

The transmitter projects a conical shaped beam that spreads as it travels. Therefore, at 100' you would have a beam spread that is approximately 4' wide. The receiver has a similar "viewing area". This means that at 100', it can receive an adequate signal from a transmitter placed anywhere within a 4' area, as long as the transmitter and receiver are aimed at each other.

The transmitter and receiver have 1" x 1 1/2" openings for the infrared light. This means that even with the flexibility in the placement of the units, the triggering object must be larger than 1" x 1 1/2". Therefore objects less than 1" x 1 1/2" (such as antennas) will not trigger the unit.

The following diagram shows the possible placements and alignments of the transmitter and receiver.

	The transmitter and receiver are placed perpendicular across the roadway and aimed well inside the beam spread of each other.
	The transmitter and receiver are placed diagonally across the roadway and aimed well inside the beam spread of each other.
	The angle of the transmitter and receiver can be adjusted to accommodate the angle of the bridge or overpass.

The OVER-HEIGHT VEHICLE DETECTOR™ is intended to be set up with the receive closest to the shoulder side of the road where the warning device(sign, flashing light, message board, etc.) is located.

OVERVIEW
OPERATION
SPECIFICATIONS

©2002 ASTI Transportation Systems, Inc.