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3098 Technical Manual Electrical Connections
3-9
3.5.5 7955 2-wire configuration
3098 7955 Flow Computer
1
+
SIG A
2
-
3
+
SIG B
4
-
330R
+24V DensitySK3/35
Ch.1
SK1/31
SK1/32
SK3/19
SK3/35
Ch.2
SK1/48
SK1/49
SK3/19
Density Sig +
Density Sig -
0V Density
Figure 3-5.21 : 7955 Flow Computer
Gas Specific Gravity 2-Wire System (Safe Area)
3098 7955 Flow Computer
1
+
SIG A
2
-
3
+
SIG B
4
-
MTL 787 (+ve)
3
4
1
2
Hazardous Area
Safe Area
+24V DensitySK3/35
Ch.1
SK1/31
SK1/32
SK3/19
SK3/35
Ch.2
SK1/48
SK1/49
SK3/19
Density Sig +
Density Sig -
0V Density
Figure 3-5.22: 7955 Flow Computer
Gas Specific Gravity 2-Wire System with Shunt-Diode Safety Barrier (Hazardous Area)
3098 7955 Flow Computer
1
+
SIG A
2
-
3
+
SIG B
4
-
MTL 5032
4
5
14
13
Hazardous Area Safe Area
200R
1
12
11
2kR
+24V DensitySK3/35
Ch.1
SK1/31
SK1/32
SK3/19
SK3/35
Ch.2
SK1/48
SK1/49
SK3/19
Density Sig +
Density Sig -
0V Density
Note: Switches on MTL5032 should be set to give a threshold voltage of 3 volts
Figure 3-5.23 : 7955 Flow Computer
Gas Specific Gravity 2-Wire System with Galvanic Isolator (Hazardous Area)