118 | Baker Hughes.
© 2021 Baker Hughes Company. All rights reserved.
Figure 40 Split Range with Supplemental Power Supply - Non-Hazardous
7.8 HART Communications with Intrinsic Safety
7.8.1 Overview
When an SVI3 is installed in a hazardous area in accordance with the applicable codes
and standards for Intrinsic Safety there are wiring considerations for successful operation
in addition to the requirements for safety
The choice and application of intrinsic safety
barriers requires special training. For additional information, consult MTL Instruments PLC
Measurement Technology Limited: www.mtl-inst.com or R.Stahl, Inc. www
.
rstahl.com.
All installations must comply with plant standards and local and international electrical
codes.
There are three basic barrier types:
• Single channel Zener diode barriers
• Dual channel Zener diode barriers
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
+
-
SVI3
HandHeld
HART
Communicator
+
-
REMOTE
PV
1-5Vdc
D/I
+ -
4-20mA OUT
+ -
1
SW #2
+ -
SW #1
+ -
2
3
+ -
4-2
0
m
A
IN
+
-
REMOTE
PV
1-5Vdc
D/I
+ -
4-20mA OUT
+ -
1
SW #2
+ -
SW #1
+ -
2
3
+ -
4-2
0
m
A
IN
+
-
HART
Modem
HART
Modem
SVI3
Computer
HandHeld
HART
Communicator
+
-
HART Compliant
Control System
4-20mA Output
+
-
HART
Filter
HART Address 1
HART Address 2
Supplemental
Voltage Source
++