Safety Sensors on Automatic Gates
On a driveway shared with a sidewalk or a school route, every safety device on a gate matters more. The running record automatic gates georgetown nochucknorris holds shows that most close calls come from a sensor that was missing, misaimed or blocked, not from the motor, and the same applies to a gate operator on a Georgetown, TX driveway. Sensors are what let a heavy steel leaf move without a person watching.
What does a photo eye do?
A photo eye sends a beam across the opening, and if anything breaks it, the gate stops or reverses. Two eyes are mounted on opposite posts at a low height, so they catch a child, a dog or the nose of a car. A swing gate usually takes one pair on each side of the leaf, and a slide gate takes a pair at the closing edge and another near the track.
What does an edge sensor do?
An edge sensor is a rubber strip on the leading edge of the gate that reports contact. It is the backup for the photo eye, and it also catches things that sit below or beside the beam. Wireless edges save running cable across the leaf, but their batteries need checking, and a wired edge needs a flexible loop where the cable crosses the hinge.
What do loop detectors do?
A loop detector is a coil of wire cut into the pavement that senses a vehicle by the metal in it. A loop at the gate keeps it from closing on a parked car, and a loop at the street opens it for a car that is arriving. The saw cut has to go through the surface and into the base, and on a concrete drive over limestone the cut takes patience and a proper blade.
Where are they mounted on a Georgetown driveway?
Placement follows the path of travel, the height of the likely obstacles and the angle of the sun. A photo eye aimed straight into low morning or afternoon sun can lose its signal, so the receiver is placed with the sun behind it. Eyes sit about knee height on a post, and a second set higher up catches taller vehicles and trailers that the first set might miss.
How are they kept working?
Sensors are tested by hand at every service visit: a cardboard box in the beam, a hand on the edge, a car over the loop. Lenses are wiped clean, cables are checked where they bend, and the sensitivity is reset if the gate has moved or settled. A sensor that is bypassed to stop a nuisance trip is a fault that has been hidden, and the better fix is to find what keeps tripping it, usually a spider web, a leaning post or a dirty lens.