Endress+Hauser Detektor DG 57 Sicherheitshinweise Seite 8

en
XA 057F-A
Electrical connection of DG 57
Gamma source
(e.g. QG 100)
Tank
Hazardous area
Zone 0
Connection of two DG 57 detectors
to two transmitters
Gamma source
(e.g. QG 100)
Tank
Hazardous area
Zone 0
Connection of the DG 57 detector
to a transmitter without an intrinsically safe
input circuit
Gamma source
(e.g. QG 100)
Tank
Hazardous area
Zone 0
Plant grounding system (here German practice)
2
EX EX
Zone 1
DG 57
EX EX
Zone 1
DG 57
DG 57
EX
EX
Zone 1
Safety barrier
e.g. GHG 1119133V1503 ABB
EEx ib IIC
DG 57
e.g. FTG 671
e.g.. FMG 671 (P)
R = 25 Ohm
max
U = 15,8 V
max
I = 75 mA
max
R = 7.5 Ohm
i
DG 57
VH VH
0 0 0 0
0 50 100
V H
1A
1B
+
E
+
mA
_
FMG 573 Z
FMG 671
VH VH
0 0 0 0
0 50 100
V H
1A
1B
+
E
+
mA
_
VH VH
0 0 0 0
0 50 100
V H
1A
1B
+
E
+
mA
_
Not intrinsically safe
e.g.. FMG 573 S
Endress+Hauser