Endress+Hauser Prosonic S FDU90 ultrasonic sensor

Endress+Hauser’s Prosonic S FDU90 ultrasonic sensor for continuous, non-contact level and flow measurement has a 70 mm blocking distance which allows the device to maximise filling capacity in short-range applications.

The blocking distance of an ultrasonic sensor is the distance measured from the sensor face, in which true level echoes cannot be distinguished from the transient characteristics of the sensor. When fill levels extend into the sensor’s blocking distance, accurate evaluation of the ultrasonic signals cannot be derived. This makes minimising blocking distances crucial to maximise filling capacity. In low-range applications claimed capacity gains of between 8% and 25% can be attained by the FDU90. In case of accidental flooding, the sensor’s IP68 protection and optional anti-flooding tube (air-trap) gives reliable measurement.

The sensor measures the level of liquids, pastes, sludges and powdery to coarse bulk materials. It is suited to harsh ambient conditions and can be connected up to 300 m from the signal transmitter. Operating pressure range is 0.7 to 4 bar and temperature range is -40 to +80ºC, with integrated temperature compensation.