SICK's UC4 ultrasonic sensor
UC4 ultrasonic sensor detects optically difficult targets such as clear, shiny and dark materials. Designed to install in tight spaces, the sensor combines pushbutton setup with detection in one housing. It has a single PNP or NPN output, capable of detecting any target within a 250 mm range. It also can be set up in three detection and output modes—Background Suppression (BGS), Window and Reflection mode.