Electrical Connection In The Potentially Explosive Areas; Gemü 1250 Electrical Connection; Gemü 1251/1252 Electrical Connection - GEM 125 Series Operating Instructions Manual

12 Electrical connection
12.2 Electrical connection in the potentially explosive
areas
In the potentially explosive area, the limit switches must be
connected to ATEX-certified buffer stages or switching ampli-
fiers (one or two channels) in ignition protection type [Ex ia/ib]
IIC.
The limit switches are "simple" electrical equipment that com-
ply with DIN EN 60079-11:2012-06 Section 5.7, that do not
have their own power sources or energy stores and for which
explicit knowledge of the limit data and the heating behaviour
is available.
The electrical components consist of reed contacts and con-
nectors.
The construction of the limit switches complies with the con-
struction regulations in accordance with:
– DIN EN 60079-0:2014-06 (Equipment – General re-
quirements)
– DIN EN 60079-11:2012-06 (Equipment protection by in-
trinsic safety "i")
– This simple, electrical equipment may be used in ac-
cordance with DIN EN 60079-14:2014-10 (Explosive at-
mospheres – Electrical installations design, selection
and erection) without certification, operated with in-
trinsically safe electric circuits of ignition protection
type "Ex i", in systems for equipment group II, category
2/D (for zone 1/21).
Potentially explosive area
Intrinsically safe electrical
equipment
Cable
Equipment group II
Zone 1 gas/21 dust
Temperature class: See
flowmeter
-20 °C < Ta < +60 °C
Fig. 8: Electrical connection in the potentially explosive areas
GEMÜ 125x
In the non-hazardous location
Associated electrical
equipment
Certified buffer stage or switching
amplifier (one or two channels) in
ignition protection type [Ex ia/ib]
12.3 GEMÜ 1250 electrical connection
Fig. 9: GEMÜ 1250 electrical connection
1
Fig. 10: Connection to the terminal block
Item
1 Uv-, Supply voltage (-)
Us-, Signal voltage (-)
2 Uv+, Supply voltage (+)
3 Us+, Signal voltage (+)
12.4 GEMÜ 1251/1252 electrical connection
Fig. 11: GEMÜ 1251/1252 electrical connection
1
Fig. 12: Connection to the terminal block
Item
1 Uv-, Supply voltage (-)
Us-, Signal voltage (-)
2 Uv+, Supply voltage (+)
3 Us+, Signal voltage (+)
28 / 36
internal external
3
2
Connection
3
internal external
3
2
Connection
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