KROHNE OPTIMASS 8300C - Ex i Signal Input;Output (I;O) Connections

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4.3 Ex i signal I/O connections
Following intrinsically safe signal I/Os are available:
•
The I/O circuits named Ex i I/O, Ex i Option are always in the Intrinsically safe (Ex ia) type of
protection. The I/O circuits Fieldbus I/O Profibus PA and Fieldbus I/O Foundation Fieldbus
can be in the Intrinsically safety type of protection.
• A maximum of 4 intrinsically safe (Ex ia) in/outputs are possible. All intrinsically safe cir-
cuits are galvanically insulated with respect to earth and each other. To avoid summation of
voltages and currents, the wiring of these Ex ia circuits must be sufficiently separated, e.g.
in line with the requirements of standard IEC/EN 60079-14, clause 12.2.
• The Ex ia signal in/outputs may only be connected to other Ex ia or ib certified device (e.g.
intrinsically safe isolation amplifiers), even if such devices are installed in the non-haz-
ardous area!
• Connection to a non-Ex i apparatus cancels the Ex ia properties of the flowmeter.
• Terminals L, N (or L+, L-) for mains connection are always non-intrinsically safe. To achieve
the necessary spatial separation to IEC/EN 60079-11 between the non-Ex i and Ex i circuits,
the mains terminals are provided with a semi-circular insulation cover with a "snap-in"
lock. This cover MUST be closed before establishing the power supply to the converter.
II//OO PPCCBB II//OO ffuunnccttiioonnss
Ex i I/O
Current Output + HART communication
Pulse / Status Output
Ex ia IIC
Ui =30V, Ii = 100 mA, Pi = 1,0 W
Ci = 10nF, Li = negligibly low
Current Output, active
+ HART communication
Ex ia IIC
Uo = 21 V, Io = 90 mA, Po = 0,5 W
linear characteristic
Co = 90 nF, Lo =2,0 mH
Co = 110 nF, Lo =0,5 mH
Ex i Option
or
Ex i Option2
Current input passive
Current Output
Pulse / Status Output / Control Input
Ex ia IIC
Ui =30V, Ii = 100 mA, Pi = 1,0 W
Ci = 10nF, Li = negligibly low
Current Output, active
Ex ia IIC
Uo = 21 V, Io = 90 mA, Po = 0,5 W
linear characteristic
Co = 90 nF, Lo = 2,0 mH
Co = 110 nF, Lo = 0,5 mH
Current input active
Ex ia IIC
Uo = 24.1 V, Io = 99 mA, Po = 0,6 W
linear characteristic
Co = 75 nF, Lo = 0.5 mH
Fieldbus I/O
Profibus-PA
Foundation Fieldbus
Ex ia IIC
Ui = 24 V, Ii = 380 mA, Pi = 5,32 W
Ci = 5 nF, Li = 10 μH
suitable for connection to an intrin-
sically safe fieldbus in accordance
with the FISCO-model
AD OPTIMASS 300_010 Haz Areas Rev 01.qxp 05/03/2014 13:25 Page 34