The safety sensing function is performed by a single image sensing device viewing a single two-dimensional image against a passive pattern as the background. Hand Detection Safety Sensor. The safety sensing function is performed by a single image sensing device viewing a single two-dimensional image against a … This reduces the number of protective heights of safety light curtains required to monitor these openings. Our Guardmaster™ SC300 Hand Detection Safety Sensor is a compact safety sensor system which operates based on image processing technology. Guardmaster™ SC300 Hand Detection Safety Sensors is a compact safety sensor system which operates based on image processing technology. Hand Detection Safety Sensor for a variety of opening orientations The new SC300 hand detection safety sensor off ers a one size fi ts all solution for openings up to 1.5 meters (4.9 ft) x 1.5 meters (4.9 ft).