Prothermo NMT 538
20
Hauser Systems & Gauging
Caution!
NMT538 HART connection can be only allowed when the Proservo NMS53x is equipped with the
intrinsically safe HART input module. The connection is not allowed when the built in spot
temperature input is selected on the Proservo NMS.
3.4.3
Connection to the Tank side monitor NRF590
Figure 9: Terminal connection on the tank side monitor NRF590
Tank sensors
The Tank side monitor NRF590 can interface up to 6 IS HART sensors. All HART sensors are
connected to one HART multi-drop communication loop. To keep the wiring simple, 3
interconnected terminal pairs are available; however, 2 pairs of terminals, 24(+) 25(-) & 26(+) 27(-
), are available for the NMT538 connection since terminals 28(+) 29(-) are reserved for the Micro
pilot S FMR 53x HART connection.
16
D+ + RTD drive
17
S+ + RTD sense
18
S- - RTD sense
19
D- - RTD drive
20 OPT1 i.s. OV
21 OPT2 4...20 mA input
22 OPT3 i.s. OV
23 OPT4 i.s. +24V
24 H+ + Hart comm.
25 H- - Hart comm.
26 H+ + Hart comm.
27 H- - Hart comm.
28 H + Hart comm.
29 H - Hart comm.
31 P-
+ i.s. power for FMR
S-series (terminal 1)
30 P+
- i.s. power for FMR
S-series (terminal 1)
4 Operation Principle
