Prosonic S FDU90/91/91F/92/93/95/96
8
Hauser
Connection hints
Caution!
• In order to avoid interference signals, the sensor cables should not be laid parallel to high voltage electric
power lines. The cables may not be laid in the proximity to frequency converters.
• The cable screen serves as a return cable and must be connected to the transmitter without any electrical
break. With the pre-assembled cables, the screen ends in a black strand (BK). With the extension cable, the
screen must be twisted together and connected to the "BK" terminal. The cable screen must not be
connected to the local potential equalization.
Warning!
• The sensors FDU83, FDU84, FDU85 and FDU86 with an ATEX, FM or CSA certificate are not certified for
connection to the FMU90 transmitter.
• for the sensors FDU91F/93/95/96 and FDU83/84/85/86:
The ground lead (GNYE) must be connected to the local potential equalization
after a maximum distance
of 30 m (98 ft)
. This can be done either
– at the terminal box or
– at the transmitter FMU90 or in the cabinet (if the distance to the sensor does not exceed 30 m (98 ft)).
Note!
For easier mounting it is advisable to use the sensors FDU90/91/92 and FDU80/80F/81/81F/82 with a
maximum cable length of 30 m (98 ft) as well. For longer distances an extension cable with a terminal box
should be used.
Extension cables for the
sensors
For distances up to 30 m (98 ft) the sensor can be directly connected by the sensor cable. For longer distances,
it is recommended to use an extension cable. The extension cable is connected via a terminal box. The total
length (sensor cable + extension cable) may be up to 300 m (984 ft).
Caution!
If the terminal box is installed in explosion hazardous areas, all applicable national guidelines must be observed.
Suitable extension cables can be obtained from Hauser (
Alternatively, cables with the following properties can be used:
• Number of cores according to the connection diagram (
• braided wire screen for the yellow (YE) and red (RD) core (no foil screen)
• Length: up to 300 m (984 ft), sensor cable + extension cable
• Cross section: 0.75 mm
2
to 2.5 mm
2
(18 to 14 AWG)
• up to 8
per core
• max. 60 nF (between core and screen)
• for FDU91F/93/95/96 and FDU 83/84/85/86: The earth lead must not be within the screening.
