SLM Series metal slot sensors from Banner Engineering Corp.
, Minneapolis, MN, sense objects that pass between the fixed-distance, opposed-mode emitter and receiver and are available in 10, 30, 50, 80, 120, and 220 mm slot widths. Features include single-turn sensitivity adjustment, visible red beam, light or dark operate, IP67 and NEMA 6 rated housings, and easy installation using molded-in beam guides. Response time is 500 ms. Suited for high-speed counting, edge detection, position verification, and level monitoring applications, the devices can sense objects as small as 0.3 mm.