Prosonic S FDU91/92/93/95/96
8
E Hauser
Installation conditions for
level measurements
L00-FDU9xxxx-17-00-00-xx-003
• If possible, install the sensor so that its lower edge projects into the vessel.
• Make sure, that the maximum level does not reach into the blocking distance (BD).
• Do not install the sensor in the middle of the tank (2). We recommend leaving a distance between the sensor
and the tank wall (1) measuring 1/6 of the tank diameter.
• Avoid measurements through the filling curtain (3).
• Make sure that equipment (4) such as limit switches, temperature sensors, baffles etc. are not located within
the emitting angle
α
. Emitting angles of the individual sensors are given in the table below. In particular,
symmetrical equipment (5) such as heating coils etc. can influence the measurement.
• Align the sensor vertically to the product surface (6). An alignment unit (FAU40) is available as an accessory
(see chapter "Accessories").
• If the multiple-channel version of the transmitter FMU90 is used, multiple sensors can be mounted in one
vessel.
• To estimate the detection range, use the 3 dB emitting angle
α
:
1
2
3
4
5
1/6D
D
r
α
R
BD
BD
6
BD
