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3098 Technical Manual Electrical Connections
3-5
3.5 System Connections (7951/7950/7955)
The density and power connections to the 3098 in safe and hazardous areas are shown in the following diagrams:
3.5.1 7950 2-wire configuration
3098 7950 Signal Converter
1
+
SIG A
2
-
3
+
SIG B
4
-
330R
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 3-5.9: 7950 Signal Converter and Gas Specific Gravity 2-Wire System (Safe Area)
3098 7950 Signal Converter
1
+
SIG A
2
-
3
+
SIG B
4
-
MTL 787 (+ve)
3
4
1
2
Hazardous Area
Safe Area
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 3-5.10: 7950 Signal Converter and Gas Specific Gravity 2-Wire System
with Shunt-Diode Safety Barrier (Hazardous Area)
3098 7950 Signal Converter
1
+
SIG A
2
-
3
+
SIG B
4
-
MTL 5032
4
5
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 -
200R
1
12
11
2kR
Note: Switches on MTL5032 should be set to give a threshold voltage of 3 volts.
Figure 3-5.11: 7950 Signal Converter and Gas Specific Gravity 2-Wire System
with Galvanic Isolator (Hazardous Area)