Masoneilan SVI3 Installation and Maintenance Manual
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© 2021 Baker Hughes Company. All rights reserved.
• Active galvanic isolators
To determine if the installation will perform successfully with HART
®
communications you
must consider HART
®
filter requirements and HART
®
barrier compliance.
7.8.2 HART Barrier Compliance
The intrinsic safety barrier must be designed to transmit the HART
®
signals in both
directions. Both passive Zener diode barriers and active galvanic isolators are offered with
HART
®
compliance. Consult the manufacturer or refer to the documents listed at the end of
this instruction manual.
Figure 41 Intrinsically Safe Installation with Zener Barrier and HART
®
Filter
REMOTE
PV
1-5Vdc
D/I
+ -
4-20mA OUT
+ -
1
SW #2
+ -
SW #1
+ -
2
3
+ -
4-
20
m
A
IN
+
-
REMOTE
PV
1-5Vdc
D/I
+ -
4-20mA OUT
+ -
1
SW #2
+ -
SW #1
+ -
2
3
+ -
4-
20
m
A
IN
+
-
HART
Modem
HART
Modem
HART
Filter
SVI3
Computer
HandHeld
HART
Communicator
Hazardous
Area
Non-Hazardous
Area
+
-
+
-
+
-
Single Channel
Zener Barrier
HART Compliant
Control System
4-20mA Output
Barrier
Resistance