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26 Micro Motion 3098 Gas Specific Gravity Meter
Electrical Connections
3.5.4 7951 3-wire configuration
Figure 3-14 7951 flow computer/7951 signal converter gas specific gravity 3-wire system (safe area)
Figure 3-15 7951 flow computer/7951 signal converter gas specific gravity 3-wire system with shunt-diode
safety barrier (hazardous area)
Figure 3-16 7951 flow computer/7951 signal converter gas specific gravity 3-wire system with galvanic
isolator (hazardous area)
Note: The barrier trip level switch should be set to 3 volts.
Note: When the ATEX/IECEx-approved specific gravity meter is installed in a hazardous area, the
safety instruction booklet shipped with the unit is the authoritative document.
3098 meter
1
+
SIG A
2
-
3
+
SIG B
4
-
7951 Signal Converter/Flow Computer
24V pwr +
PL5/9 (SK6/22)
Ch.3
PL5/5 (SK6/18)
PL5/6 (SK6/19)
PL5/10 (SK6/24)
PL5/9 (SK6/22)
Ch.4
PL5/7 (SK6/20)
PL5/8 (SK6/21)
PL5/10 (SK6/24)
Den ip +
Den ip -
24V pwr -
(0V dc)
(Den -)
(+24V dc)
(Den +)
3098 meter
1
+
SIG A
2
-
3
+
SIG B
4
-
Hazardous Area
Safe Area
MTL 787 (+ve)
3
4
1
2
7951 Signal Converter/Flow Computer
24V pwr +
PL5/9 (SK6/22)
Ch.3
PL5/5 (SK6/18)
PL5/6 (SK6/19)
PL5/10 (SK6/24)
PL5/9 (SK6/22)
Ch.4
PL5/7 (SK6/20)
PL5/8 (SK6/21)
PL5/10 (SK6/24)
Den ip +
Den ip -
24V pwr -
(0V dc)
(Den -)
(+24V dc)
(Den +)
Meter
1
+
SIG A
2
-
3
+
SIG B
4
-
MTL 5532
4
1
14
13
Hazardous Area Safe Area
7951 Flow Computer/Signal Converter
5 12
11
2kR
24V pwr +
PL5/9 (SK6/22)
Ch.3
PL5/5 (SK6/18)
PL5/6 (SK6/19)
PL5/10 (SK6/24)
PL5/9 (SK6/22)
Ch.4
PL5/7 (SK6/20)
PL5/8 (SK6/21)
PL5/10 (SK6/24)
Den ip +
Den ip -
24V pwr -
(0V dc)
(Den -)
(+24V dc)
(Den +)