Prothermo NMT 538
Hauser Systems & Gauging
19
Chart 1: Typical cable capacitance & distance for 1.02mm (#18 AWG) shield twisted pair
-If you use an unscreened wire, then equip it with a conduit pipe.
-Connect the cable screen to the frame ground.
3.4.2
Connection to the Proservo NMS53x
Figure 8: Terminal connection on the Proservo NMS
Tank sensors
The Proservo NMS53x can interface up to 4 HART sensors. All HART sensors are connected to
one HART multi-drop communication loop internally. In order to separate IS and non-IS HART
sensory connection, 2 pairs of HART terminals are equipped on the Proservo NMS53x. The
NMT538 can be connected only on terminals 24(+) & 25(-) where the IS HART module is installed.
Cable Capacitance - pf / m (pf / ft)
65 pf / m
95 pf / m
160 pf / m
225 pf / m
(20 pf / ft)
(30 pf / ft)
(50 / pf / ft)
(70 pf / ft)
NO. Network Devices
Cable length - meters (feet)
2763 m
2000 m
1292 m
985 m
(9000 ft)
(6500 ft)
(4200 ft)
(3200 ft)
5
2462 m
1815 m
1138 m
892 m
(8000 ft)
(5900 ft)
(3700 ft)
(2900 ft)
1
10
2154 m
1600 m
1015 m
769 m
(7000 ft)
(5200 ft)
(3300 ft)
(2500 ft)
1846 m
1415 m
892 m
708 m
(6000 ft)
(4600 ft)
(2900 ft)
(2300 ft)
15
4 ... 20 mA
4 ... 20 mA
Channel 1
Channel 2
Port_A-
IS HART
or
+
+
_
_
A
B
b
22
23
24
25
26
+
_
COM
HOIST
STOP
Operation
contact
input
20
21
16
19
18
17
Alarm contact
Alarm contact
Alarm contact
+
_
+
_
+
_
10
15
14
13
12
11
Alarm contact
+
_
Port_B-
Non IS HART
to NRF or others
+
_
9
8
7
6
5
4
Power supply
AC 85 ... 264V 50/60Hz
or
DC 20 ... 62V AC20 ... 55V
2
3
1
G
N
L
L
G
N
ARS
ARS
ARS
+
_
Digital output
Rack bus RS485,
Serial pulse,
or
HART
1
2
3
ARS
ARS
ARS
L
N
GND
L
G
N
46
8
10
12
5
7
9
11
13
NRF
+
NRF-
RC
A/+
RC
B/-
AL1
AL1
AL2
AL2
AL3
AL3
14
16
18
22
15
17
19
21
23
AL4
AL4
COM
CTR1
CTR2
N.C
.
O
T1-
O
T1+
O
T2-
O
T2+
20
24
26
25
P_A+
A
P_A-
B
b
From NMT 538
3 Installation
