KROHNE ALTOFLUX IFM 5080 K EEx EN - Manual (Page 6)

6
5 Connection diagrams of the signal in/outputs
For the connection diagrams of the signal in/outputs see the next pages. It has to be noted that the
intrinsically safe signal in/outputs may only be connected to following electrical apparatus
(registering devices like amp-meters, pulse counters etc.):
- certified intrinsically safe apparatus
- certified associated apparatus
- passive apparatus as defined in your national standard code of practice for the installation of
electrical apparatus for use in potentially explosive atmospheres.
Other apparatus may only be connected to the signal in/outputs through certified safety barriers,
certified isolating interface units and the like. For ease of reading these barriers or units are not
shown in the connection diagrams, it is assumed that they are integrated in the registering devices
or as separate devices connected in series with them.
The registering devices may only be installed in the hazardous area insofar they are also explosion
protected (constructed in a suitable type of protection as prescribed in your national standard code
of practice).
When connected to other intrinsically or associated apparatus the maximum input/output
parameters of all intrinsically safe circuits have to be taken into account.
The maximum parameters of the signal in/outputs of the IFC090 i-EEx converters are included in
the Certificate of Conformity KEMA no. Ex-92.C.7162, 4 th. Amendment, page 1/3 and page 2/3.
These maximum values are also shown in following table:
MODIS-Module intrinsically safe maximum parameters
P-SA, FA-ST U
i
= 30 V, I
i
= 250 mA, P
i
=1,0 W
C
i
= 5 nF, L
i
≈
0
F-PA U
i
= 30 V, I
i
= 300 mA, P
i
= 4,2 W
C
i
= 5 nF, L
i
≈
0
DC-I U
o
= 23,5 V, I
o
= 98 mA, P
o
= 0,6 W
C
o
= 127 nF, L
o
= 4 mH
The modules P-SA and DC-I (IFC090 i-EEx version Ex-i3) and FA-ST and DC-I (IFC090 i-EEx
version Ex-i5) are internally connected in series.
If an intrinsically safe circuit of an associated electrical apparatus (i.e. a circuit that is active under
the fault conditions specified in the standard EN 50 020) it's maximum output voltage U
o
may not
exceed 6,5 V. See also the remark on page 2/3 of the 4 th Amendment.