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Electrical Connections 3098 Technical Manual
3-8
3.5.4 7951 3-wire configuration
3098 7951 Signal Converter/Flow Computer
1
+
SIG A
2
-
3
+
SIG B
4
-
24V pwr +
PL5/9 (SK6/22)
Ch.1
PL5/1 (SK6/14)
PL5/2 (SK6/15)
PL5/10 (SK6/24)
PL5/9 (SK6/22)
Ch.2
PL5/3 (SK6/16)
PL5/4 (SK6/17)
PL5/10 (SK6/24)
Den ip +
Den ip -
24V pwr -
(0V dc)
(Den -)
(+24V dc)
(Den +)
Figure 3-5.18 : 7951 Flow Computer/7951 Signal Converter
Gas Specific Gravity 3-Wire System (Safe Area)
3098 7951 Signal Converter/Flow Computer
1
+
SIG A
2
-
3
+
SIG B
4
-
Hazardous Area
Safe Area
MTL 787 (+ve)
3
4
1
2
24V pwr +
PL5/9 (SK6/22)
Ch.1
PL5/1 (SK6/14)
PL5/2 (SK6/15)
PL5/10 (SK6/24)
PL5/9 (SK6/22)
Ch.2
PL5/3 (SK6/16)
PL5/4 (SK6/17)
PL5/10 (SK6/24)
Den ip +
Den ip -
24V pwr -
(0V dc)
(Den -)
(+24V dc)
(Den +)
Figure 3-5.19 : 7951 Flow Computer/7951 Signal Converter
Gas Specific Gravity 3-Wire System with Shunt-Diode Safety Barrier (Hazardous Area)
3098 7951 Signal Converter/Flow Computer
1
+
SIG A
2
-
3
+
SIG B
4
-
MTL 5032
4
1
14
13
Hazardous Area Safe Area
5 12
11
2kR
24V pwr +
PL5/9 (SK6/22)
Ch.1
PL5/1 (SK6/14)
PL5/2 (SK6/15)
PL5/10 (SK6/24)
PL5/9 (SK6/22)
Ch.2
PL5/3 (SK6/16)
PL5/4 (SK6/17)
PL5/10 (SK6/24)
Den ip +
Den ip -
24V pwr -
(0V dc)
(Den -)
(+24V dc)
(Den +)
Note: Switches on MTL5032 should be set to give a threshold voltage of 3 volts
Figure 3-5.20 : 7951 Flow Computer/7951 Signal Converter
Gas Specific Gravity 3-Wire System with Galvanic Isolator (Hazardous Area)