| | EXIT WANDS AND LOOPS An Overview For The Beginner
WANDS - Exit wands detect moving metal. Exit wands normally detect a car going past that is within about 6’ and traveling about 5 m.p.h. (idle speed). Allowing for the width of the car, the wand covers about a 12’ wide drive. Wands do not require saw cutting the pavement as they (and the lead cable) are usually buried along side the drive up to 50-500 feet back from the gate. Speed and metal mass effects wand sensitivity. Exit wands usually can not be used for entrance applications unless the gate is a considerable distance from the main road and it’s faster moving traffic.
LOOPS - Loops detect the metal in cars and trucks, both moving and non moving. Loops are connected to detectors and come in two (2) basic formats, single loop and double loop. This permits various different combinations of applications. Loops can be used to open gates (free exit) and as hold-open-loops (formerly called safety loops). Shadow loops are used on swing gates when the distance between the inner and outer loop is excessive. Below are several sample application diagrams. When connecting loops, remember to connect them to the appropriate operator circuit (exit, hold open, shadow loop). Some operators may require additional relays and/or switches for shadow loop applications.
NOTICE: Loops Do Not detect humans or animals*.
Statements, diagrams and tips authored by D.A.D.S., Inc. and contained in this box are not guaranteed to be safe and/or accurate for every application. Refer to the gate operator manufacturer’s installation instructions for complete safety and installation information. Humans and vehicles may require different protection devices.
* Horseshoes have been known to trigger metal sensing devices.
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