Prosonic S FDU90/91/91F/92/93/95/96
8 Endress + 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.
"
Caution!
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.
#
Warning!
The sensors FDU83, FDU84, FDU85 and FDU86 with an ATEX, FM or CSA certificate are not certified for
connection to the FMU90 transmitter.
#
Warning!
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. 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).
!
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 as well. For longer distances an extension cable with a terminal box should
be used.
Connection of the sensor
heater (for FDU90/FDU91)
The FDU90 and FDU91 sensors are available in a version with heater. The power for this heater must be
provided by an external power supply unit. The supply voltage is connected to the brown (BN) and blue (BU)
strands of the sensor cable.
Technical Data
• 24 VDC ± 10%; residual ripple < 100 mV
• 250 mA per sensor
!
Note!
When using the sensor heater, the temperature compensation of the ultrasonic measurement must be
performed with an external temperature probe, which is connecte to the additional temperature input of the
FMU90 transmitter (see Technical Information TI397F).
Extenxion cables for the
sensors
For distances up to 30 m 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.
"
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 Endress+Hauser (s. chapter "Accessories")
Alternatively, cables with the following properties can be used:
• Number of cores according to the connection diagram (see above)
• braided wire screen for the yellow (YE) and red (RD) core (no foil screen)
• Length: up to 300 m (sensor cable + extension cable)
• Cross section: 0,75 mm
2
to 2,5 mm
2
• up to 6 Ω per core
• max. 60 nF
• for FDU91F/93/95/96 and FDU 83/84/85/86:
The earth lead must not be within the screening.
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