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The Safety Sensors are designed to detect an obstacle in the path of the electronic beam and stop the gate operator. CARTON INVENTORY Verify carton inventory below. Hex Head Bolt (2) Wing Nut (2) IMPORTANT INFORMATION ABOUT THE SAFETY SENSORS When properly connected and aligned, the sensor will detect an obstacle in the path of its electronic beam. The sensors must be installed so that the sending and receiving eyes face each other across the gate, no more than 24" (61 cm) above the groun