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Electrical Connections 3098 Technical Manual
3-6
3.5.2 7950 3-wire configuration
3098 7950 Signal Converter
1
+
SIG A
2
-
3
+
SIG B
4
-
Density power +PL9/1
Ch.1
PL9/2
PL9/3
PL9/4
PL9/5
Ch.2
PL9/6
PL9/7
PL9/8
Density input +
Density input -
Density power -
Figure 3-5.12: 7950 Signal Converter and Gas Specific Gravity 3-Wire System (Safe Area)
3098 7950 Signal Converter
1
+
SIG A
2
-
3
+
SIG B
4
-
Hazardous Area Safe Area
MTL 787 (+ve)
3
4
1
2
Density power +PL9/1
Ch.1
PL9/2
PL9/3
PL9/4
PL9/5
Ch.2
PL9/6
PL9/7
PL9/8
Density input +
Density input -
Density power -
Figure 3-5.13: 7950 Signal Converter and Gas Specific Gravity 3-Wire System
with Shunt-Diode Safety Barrier (Hazardous Area)
3098 7950 Signal Converter
1
+
SIG A
2
-
3
+
SIG B
4
-
MTL 5032
4
1
14
13
Hazardous Area Safe Area
Density power +PL9/1
Ch.1
PL9/4
PL9/3
PL9/2
PL9/5
Ch.2
PL9/8
PL9/7
PL9/6 Density input +
Density input -
Density power -
5 12
11
2kR
Note: Switches on MTL5032 should be set to give a threshold voltage of 3 volts
Figure 3-5.14: 7950 Signal Converter and Gas Specific Gravity 3-Wire System
with Galvanic Isolator (Hazardous Area)