Endress+Hauser Prosonic S FDU90, Technical Information

Prosonic S FDU90/91/91F/92/93/95/96

14

Hauser

Note!
• The process seal is not included in the delivery.
• Hauser supplies DIN/EN flanges made of stainless steel AISI 316L with the material number 

1.4404 or 1.4435. With regard to their temperature stability properties, the materials 1.4404 and 1.4435 
are grouped under 13E0 in EN 1092-1 Tab. 18. The chemical composition of the two materials can be 
identical.

Caution!
For 3A applications:
The internal diameter of the nozzle should be selected according to the valid allowable limits for 3A 
applications. Usually, the internal diameter of the nozzle should be larger than or equal to the internal diameter 
of the sensor.

Nozzle installation

Install the sensor at a height so that the blocking distance BD is not undershot, even at maximum fill level. Use 
a pipe nozzle if you cannot maintain the blocking distance in any other way. The interior of the nozzle must 
be smooth and may not contain any edges or welded joints. In particular, there should be no burr on the inside 
of the tank side nozzle end. Note the specified limits for nozzle diameter and length. To minimise disturbing 
factors, we recommend an angled socket edge (ideally 45°).

L00-FDU9xxxx-17-00-00-xx-006

Maximum nozzle length [mm (in)]

Nozzle 
diameter

FDU90

1)

1) 

mounted at the rear side thread

FDU90

2)

2) 

mounted at the front side thread (flush mounting)

FDU91

FDU91F

FDU92

FDU93

FDU95

FDU96

DN50/2"



50 (1.97)













DN80/3"

340 (13.4) 250 (9.84) 340 (13.4) 250 (9.84)

3)

3) 

Valid for flush mounting; for mounting with G/NPT 1" and DN100 or higher see FDU91.









DN100/4"

390 (15.4) 300 (11.8) 390 (15.4) 300 (11.8)











DN150/6"

400 (15.7) 300 (11.8) 400 (15.7) 300(11.8)



400 (15.7)







DN200/8"

400 (15.7) 300 (11.8) 400 (15.7) 300(11.8)



400 (15.7) 520 (20.5)





DN250/10"

400 (15.7) 300 (11.8) 400 (15.7) 300(11.8)



400 (15.7) 520 (20.5) 630 (24.8)



DN300/12"

400 (15.7) 300 (11.8) 400 (15.7) 300(11.8)



400 (15.7) 520 (20.5) 630 (24.8) 800 (31.5)

Sensor characteristics

Emission angle 



12°

12°

9°

12°

11°

4°

5°

6°

Blocking 
distance [m (ft)]

0.07 (0.2)

0.07 (0.2)

0.3 (1)

0.3 (1)

0.4 (1.3)

0.6 (2)

0.7 (2.3)

1.6 (5.2)

Max. measuring 
range [m (ft))
in liquids

3 (9.8)

3 (9.8)

10 (33)

10 (33)

20 (66)

25 (82)





Max. measuring 
range [m]
in solids

1.2 (3.9)

1.2 (3.9)

5 (16)

5 (16)

10 (33)

15 (49)

45 (148)

70 (230)

L

D

FDU9x

D

FDU91F

45°

L

L

D

L

D

FDU90

FDU90

45°

45°

45°