Pepperl+Fuchs Proximity Switches Ultrasonic retroreflective sensor 623992 - Pepperl+Fuchs UB400-F77-E2-V31, The Pepperl+Fuchs UB400-F77-E2-V31 is an ultrasonic retroreflective sensor that operates with PNP NO output. It is designed for precise detection of objects using ultrasound, making it ideal for automation and industrial applications. This sensor can detect both stationary and moving objects effectively, ensuring reliable proximity sensing. Pepperl+Fuchs UB400-F77-E2-V31 Ultrasonic Sensor PNP NO Teach-In