3
ELECTRICAL CONNECTIONS
14
OPTIWAVE-M 7400
www.krohne.com
10/2018 - 4007039501 - AD ATEX OPTIWAVE-M 7400 R01a
•
The minimum thickness of the insulation must be 0.5 mm.
3.6 Maximum intrinsically-safe values for the electrical circuit
Level transmitter
Pressure transmitter (optional)
For the maximum intrinsically-safe values, refer to the nameplate on the pressure transmitter.
3.7 Supply voltage
Level transmitter
Pressure transmitter (optional)
For the power supply data, refer to the nameplate on the pressure transmitter.
CAUTION!
Power supply:
Connect the electrical wires for the level transmitter to terminal "+" and "-". If your device has
the optional pressure transmitter, connect electrical wires from the pressure transmitter to
terminal "A" and "B".
Output
Intrinsically-safe values for the electrical circuit
U
i
I
i
P
i
C
i
L
i
[V]
[mA]
[mW]
[nF]
[
µ
H]
4...20 mA passive
–
HART
≤
30
≤
130
≤
1000
=10
~ 0
WARNING!
Connect an intrinsically-safe barrier to the level transmitter. If your device has the optional
pressure transmitter, use a different intrinsically-safe barrier for the pressure transmitter.
These two intrinsically-safe circuits must be galvanically isolated. Make sure that the electrical
wires are rated for a test voltage of 500 V
RMS
.
Current output terminals
Minimum voltage at
output terminals [V DC]
Maximum voltage at
output terminals [V DC]
Ter / -
12
30
