3.1 Wiring examples
The following figures show wiring examples for typical applications: In general:
•
If possible, ground both ends of the signal line screening. If this is not possible,
ground at the sensor side only.
•
In hazardous areas, the signal line may be grounded at the sensor side only.
Observe the instructions in the certificate.
4...20 mA with HART
Use screened, twisted pairs.
•
Min. load for HART 250 Ω
•
Max. load:
Housing F12: 1100 Ω, for EEx ia 820 Ω
Housing T12: 750 Ω, for EEx e 750 Ω.
•
Power
(load dependent, see Chapter 9.2.)
Housing F12
standard 16...36 VDC
EEx ia 16...30 VDC
Housing T12
standard 16...30 VDC
EEx e 16...30 VDC
System integration via
4...20 mA with HART
System Integration via interface FXN 672
and Rackbus gateway ZA 67x.
•
Power: supplied by FXN 672
Screened, twisted pairs are recommended
for the loop-power line.
1234
L- L+
I+ I-
BA171Y24
optional PLC
with active
output
power
plant
ground
DXR 275
or
FXA 191
communication
resistor
test sockets
(via interlock
diode)
Caution!
1
d4
ZA 67x
FXN 672
d2
234
L- L+
I+ I-
BA171Y25
plant
ground
Rackbus
Micropilot FMR 231 Chapter 3 Connection
Endress+Hauser 15
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