Application
Controls automatic doors or gates when a vehicle is present.
Description
Loop detectors in recent years have become a popular tool having innumerable applications in policing, right from surveillance operations to traffic control. Automation of gates and doors has become a popular usage of the loop detector.
The digital technology of the loop detector enables the equipment to sense a change in the inductance of the loop as soon as it detects the metal object in its path. The inductive loop which detects the object is made of insulated electrical wire and is arranged either as a square or rectangle shape. The loop consists of several loops of wire and consideration should be giving to the loop sensitivity when installing on different surfaces.
Setting the correct sensitivity allows the loops to operate with maximum detection. When detection occurs, the detector energises a relay for the output. This energising of the relay can be configured, to three different modes, by selecting the output switch on the detector.
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 a distance of 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)
