Technical information

19
Connection of HART
instruments
Tank sensors
The Tank Side Monitor can interface to a maximum of 6 i.s. HART sensors.
All HART sensors are connected to one HART multi-drop communication loop.
In order to keep wiring simple, 3 interconnected terminal pairs are available. The terminal pairs are marked
respectively H+ and H-.
Power supply for Micropilot S
For supplying extra i.s. power to the FMR S-series radar, additional power terminals are available, marked as
P+ and P-. Although it is possible to use only 3 wires between the S-series radar and the NRF590, by combining
the P- and H- wires, it is recommended to use a double pair of screened and twisted cable.
Grounding of the cable screen (for Micropilot S)
The screen of the cable connecting the Micropilot S to the Tank Side Monitor should be grounded at the Tank
Side Monitor, not at the Micropilot S.
L00-NRF590-04-08-08-yy-007
Spot RTD
12345
1
3
2
4
5
RTD
NRF 590 i.s. terminal board
i.s. module wiring
HART
sensor
+
-
-
+
16
17
18
19
D+
S+
S-
D-
20
21
22
23
OPT1
OPT2
OPT3
OPT4
24
25
26
27
+
-
+
H
H
-
+
-
+
P
H
-
28
29
30
31
For Micropilot
S-series only!
Internally
interconnected
as one HART
fieldbus loop
2
1
4
3
12
3
4
Tank potential
Micropilot S
Tank Side Monitor
L00-NRF590-04-00-08-en-007
A spot RTD can be connected to the NRF590 if the
option is installed. For 4-wire connection, the RTD
must be connected to the 4 available terminals
marked D+, S+, S- and D-. For 3-wire connection,
the RTD should be connected to the same 4
terminals. The terminals D- and S- should be
connected together directly at the NRF590 terminals.
RTD
4 wire
RTD
3 wire