The UM18-51111 is an ultrasonic PNP/NO/NC sensor manufactured by SICK. It has a straight sensing range of 30 to 250 mm and features a 10-30 VDC power supply, an industrial frequency of 8 kHz, and a 2 meter cable connection. It is designed for detecting a wide variety of materials, objects, and liquids. The sensor is also protected against any IP 67 rated water and dust ingress, making it ideal for use in both indoor and outdoor environments. Additionally, the UM18-51111 is RoHS compliant and UL approved.