Endress+Hauser Prosonic S FMU90 - 4.4 Connection of the sensor heater (for FDU91)

Wiring
26
4.4 Connection of the sensor heater (for FDU91)
The FDU91 sensor is 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
4.4.1 Connection in the field housing
For the sensor with heater, a special terminal module is supplied for the connection of the supply
voltage. This terminal module can be inserted into the field housing:
L00-FMU90xxx-04-00-00-xx-013
(a): Terminal module for the sensor heater; (b): External power supply unit;
BN: Brown strand; BU: Blue strand
Display
POWER
HART
0/4…20mA
Sync
Fuse
I
1
FDU-
Sensor
RD
11
BK
10
YE
9
40
39
5
4
6
7
8
1
1
Service
Relay
3
2
1
BN
FMU90
FDU91
(a)
(a)
BU
24 VDC
+
-
(b)
RD
BK
YE
ABCD
A+
BBN
C-
DBU