Leuze electronic hrtu 420 ultrasonic proximity sensors w background suppression leuze electronic 50113992 a small ultrasonic scanner with background suppression in a plastic housing with protection class ip67 the sensor exhibits switching behaviour that is largely independent of the surface properties of the target and there is precise switching point adjustment through a teach in facility on the sensor and via cable leuze electronic 50113992 hrtu 4204no2 s s8 ultrasonic proximity senso