KROHNE OPTISONIC 3400 Ex EN - Manual (Page 24)

4
ELECTRICAL CONNECTIONS
24
OPTISONIC 3400
www.krohne.com 10/2013 - 7312472200 - AD EX OPTISONIC 3400 -en- R02
4.5 "Ex i" I/O connections
The following intrinsically safe I/O connections are available:
The I/O circuits titled “Ex i I/O” and “Ex i Option” are always provided with type of protection
Intrinsic Safety (Ex ia). The I/O-circuits “Fieldbus I/O Profibus-PA” as well as “Fieldbus I/O
Foundation Fieldbus” can be provided with type of protection Intrinsic Safety.
Up to a maximum of 4 intrinsically safe (Ex ia) in-/outputs are possible. All intrinsically safe
circuits are galvanically isolated with respect to earth and each other. To avoid summation of
voltages and current, the wiring of these “Ex ia”-circuits must be sufficiently separated, e.g. in
accordance with the requirements of standard EN 60079-14, clause 12.2.
The “Ex ia” in-/outputs may only be connected to other “Ex ia” or “Ex ib” approved devices (e.g.
intrinsically safe isolation amplifiers), even if such devices are installed in a non-hazardous
location !
Connection to non-“Ex i” devices, cancels the “Ex ia” properties of the flowmeter.
Terminals L and N (or L+ and L-) for connection of the mains supply are not available with type of
protection “intrinsic safety”. To achieve the necessary separation distances between the non-I.S.
and I.S.according to EN 60079-11 between the non-”Ex i” and “Ex i” circuits, the mains terminals
are provided with a semi-circular protection cover with a “snap-in” lock. This cover MUST be
closed before establishing the power supply to the converter.
I/O PCB I/O PCB I/O PCB I/O PCB I/O functions I/O functions I/O functions I/O functions
Ex i I/O Current Output + HART
communication
Pulse / Status Output
Current Output, active +
HART communication
Ex ia IIC
U
i
= 30 V, I
i
= 100 mA, P
i
= 1,0 W
C
i
= 10 nF, L
i
= negligibly low
Ex ia IIC
U
o
= 21 V, I
o
= 90 mA, P
o
= 0,5 W
Lineair characteristics
C
o
= 90 nF, L
o
= 2,0 mH
C
o
= 110 nF, L
o
= 0,5 mH
Ex i Option Current Output
Pulse / Status Output /
Control Input
Current Output, active
Ex ia IIC
U
i
= 30 V, I
i
= 100 mA, P
i
= 1,0 W
C
i
= 10 nF, L
i
= negligibly low
Ex ia IIC
U
o
= 21 V, I
o
= 90 mA, P
o
= 0,5 W
Lineair characteristics
C
o
= 90 nF, L
o
= 2,0 mH
C
o
= 110 nF, L
o
= 0,5 mH
Fieldbus I/O Profibus-PA
Foundation Fieldbus
Ex ia IIC
U
i
= 24 V, I
i
= 380 mA, P
i
= 5,32 W
C
i
= 5 nF, L
i
= 10 μH
Suitable for connection to an intrinsically safe
fieldbus in accordance with the FISCO model.
INFORMATION!
For flow converters with an
“ Ex e ” terminal compartment,installed in a Division 2, the non-
incendive terminal compartment can be opened in an energized state for short periods of time,
to access the intrinsically safe terminals for possible checks. However, the semi-circular
insulation cover over the non-intrinsically safe mains supply terminals L and N (or L+ and L-)
MUST be kept closed.