KROHNE OPTISONIC 6300 EEx EN - Manual (Page 19)

ELECTRICAL CONNECTIONS
4
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OPTISONIC 6300
www.krohne.com 03/2010 - 7309972300 - EX OPTISONIC 6300 R03 en
4.3 "Ex i" I/O connections
The following intrinsically safe I/O connections are available:
The I/O circuits titled “Exi-IO” and “Exi-Option” are always provided with type of protection
Intrinsic Safety (Ex ia).
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 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
Exi-IO 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
Exi-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