Balluff BES021E Inductive Sensor, 30 mm Range, Non-Flush, PNP-NO/NC, 10-30 VDC, BES Series Overview Our standard inductive sensors are ideal for object detection in metal areas. Here, they are suitable for a multitude of applications. Because they work without contact, they are wear-free and very resistant to dirt. The sensors are also short-circuit-proof. We provide the inductive standard..