1
INTRODUCTION
16
OPTIFLUX
www.krohne.com
07/2010 - 7309482600 - AD EX IFC 300 R06 en
1.8 IFC 300 F
The IFC 300 F is certified as a group II, category 2 GD equipment, if fitted without Ex ia signal
in/outputs or as a group II, category 2 (1) GD equipment, if fitted with Ex ia signal inputs/outputs.
It is therefore suitable for installation in gas hazardous areas zone 1 or 2, gas group IIC,
temperature class T6 and dust hazardous areas zone 21 or 22, surface temperature T85
°
C.
Additionally, The Ex ia signal in/outputs of the converter may run or originate from a zone 0 gas
hazardous area.
In the IFC 300 F signal converter the following types of protections are used:
Converter housing, connection compartment:
Converter housing, connection compartment:
Converter housing, connection compartment:
Converter housing, connection compartment: with power supply (terminals L, N / L+, L-) and I/O
connections (terminals A, A+, A-, B, B-, C, C-, D and D- ): Ex e (Increased safety). Optionally
compact flowmeters have Ex d (Flameproof Enclosure). For certain versions of the signal
converter the terminals A, A+, A-, B, B-, C, C-, D and D- are additionally Ex ia (Intrinsic safety).
Consult the table with CG numbers for details.
Converter housing, electronics compartment:
Converter housing, electronics compartment:
Converter housing, electronics compartment:
Converter housing, electronics compartment: Ex d (Flameproof enclosure)
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 < 40 V (switched DC voltage, alter40 and -40 V), I = 125 mA (injected square wave
current). The field current source is protected by 2 TR5 fuses, rated value 160 mA. The maximum
prospective short circuit current is restricted to 35 A.
Electrode terminals
Electrode terminals
Electrode terminals
Electrode terminals, in type of protection "Intrinsic safety" (Ex ia), terminals 1, 2, 20, 3, 30, 4 and
40:
U
o
= 14 V , I
o
= 70 mA, P
o
= 300 mW (lineair), C
o
= 430 nF, L
o
= 2 mH.
The Ex marking is II 2 GD EEx de [ia] IIC T6 T85
°
C for converters with non Ex ia signal in/outputs
or II 2 (1) GD EEx de [ia] IIC T6 T85
°
C for converters with Ex ia signal in/outputs.
