These switches are ideally suitable for level monitoring applications. The sensing range can be from 0.2 m to 20 meters. These sensors have the ability to perform in dry and dusty environments. These sensors are immune to electrical noise levels generally present in the typical industrial environment. The ultrasonic sensors find applications for Anti-collision detection for cranes, Level controller for liquids and solids, Detection of moving object, Opening / Closing of doors by detecting motion.