KROHNE OPTIFLUX 2000-4000-5000-6000-7300-IFC 300 Ex EN - Manual (Page 14)

1
INTRODUCTION
14
OPTIFLUX
www.krohne.com 07/2010 - 7309482600 - AD EX IFC 300 R06 en
1.6.2 Field versions
OPTIFLUX 6000 F is certified as group II, category 2 GD equipment for gas hazardous areas zone
1 and 2, gas group IIC, temperature classes T6…T3 and dust hazardous areas zone 21 and 22,
surface temperature T180°C.
The connection box contains terminals for the connection of the field current and electrode
circuits:
Field current circuit
Field current circuit Field current circuit Field current circuit, in type of protection "Increased safety" (Ex e), terminals 7, 8 and 9:
U < 50 V (switched DC voltage, alternately +40 and -40 V), I = 125 mA (injected square wave
current),
Electrode circuit
Electrode circuit Electrode circuit Electrode circuit, in type of protection "Intrinsic safety" (Ex ia), terminals 1, 2, 3 and 4:
U
i
= 20 V , I
i
= 175 mA, C
i
≈ 0 nF, L
i
≈ 0 mH.
The before mentioned intrinsically safe circuits shall, from the safety point of view, be
considered to be connected to ground.
The cable gland for the electrode circuit is - as intrinsic safe circuit - marked with a blue O-ring.
Ex marking OPTIFLUX 6000 F:
Nominal diameter Nominal diameter Nominal diameter Nominal diameter II 2 GD
25...80 Ex e ia mb IIC T6...T3 T180°C