Ultrasonic Level Gauge · Cargo Level & Temperature Gauging
The Endress+Hauser Prosonic S FDU95 is an ultrasonic sensor that measures the level of liquids and bulk solids continuously and without contact, in crushers, silos, stockpiles and on conveyor belts, and it can also derive flow in open flumes and measuring weirs. Its maximum range is 45 m (148 ft) in bulk solids. An integrated temperature sensor corrects the time of flight, the sensor is weather resistant and flood-proof (IP68), and the transmitter can be installed up to 300 m (984 ft) away. The type code separates two versions, called first (FDU95-*1***) and second (FDU95-*2***) below. Blocking distance is 0.7 m (2.3 ft) for FDU95-#1### and 0.9 m (3.0 ft) for FDU95-#2###.
Operating frequency is 17 kHz for the first version and 18 kHz for the second. Process temperature is -40 to +80 C for the first version, while the second allows -40 to +150 C non-Ex and -40 to +130 C Dust-Ex. The membrane is 316L (1.4404) with PE coating on the first version and plain 316L on the second. To estimate the effective range, the applicable attenuation values are added up and the total is read against a range chart. A very turbulent liquid surface adds 10 to 20 dB, a hard rough bulk surface such as rubble 40 dB and a soft one such as peat 40 to 60 dB.
For level measurement the recommended wall distance is 1/6 of the vessel diameter D, and no internal fixtures should sit in the signal beam. With bulk solids the FAU40 alignment unit is used to set the sensor perpendicular to the surface. IP68/NEMA6P was verified by immersion for 24 h at a depth of 1.83 m (6 ft), and weight with a 5 m (16 ft) cable is approximately 4.5 kg (9.92 lb). CE conformity and RoHS 2011/65/EU are stated, and Ex approvals are referred to the Product Configurator. Extension cable order numbers are 71027743 for PVC and 71027745 for silicone.
Sources: Endress+Hauser datasheet Prosonic S FDU95, checked 05.10.2026
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