The RPS-401 & RPS-426 Self Contained Ultrasonic Position Sensors can be operated in either proximity or hysteresis modes operating as either proximity sensors or level sensors. RPS-401 in Plastic Housing RPS-426 in Stainless Steel Housing Sensing Range 4–40″, 8–80″ Narrow Sensing Beam High Frequency Range & Hysteresis Controls Reverse Polarity Protected Short Circuit Protected Operates in Hostile Environments Operating Voltage 20-30 VDC Isolated N.O. N.C. Solid State Relays Click below to view the datasheet: Datasheet RPS-401 Datasheet RPS-426 Enquire Now