Energetic light sensors are ideal for detecting contrast differences. They detect objects depending on their surface, color and material. They are cost-effective, easy to install and align. Series=21M, dimensions=15 x 50 x 42.5 mm, interface=NPN normally open (NO) NPN normally closed (NC), operating principle=optoelectronic sensor, optical operating principle=light sensor, energetic, beam characteristics=divergent, light type=infrared, range=50...2000 mm, connection=plug connector, M12x1 plug, 4-pin, housing material=zinc, die-cast aluminum, active surface, material=PMMA, operating voltage Ub=10...30 VDC, approval/conformity=CEcULusEACWEEE