BEKA PROFIBUS PA BA444DF-P, Manual

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4. SYSTEM DESIGN FOR HAZARDOUS
AREAS
4.1 FISCO Systems
The BA444DF-P fieldbus indicator may be
connected to any ATEX certified FISCO compliant
fieldbus segment, providing the segment can
supply the additional 13mA required to operate the
instrument.
Fig 1 shows a typical fieldbus segment. To comply
with FISCO requirements, the power supply,
terminators, field devices and the interconnecting
cables must conform with IEC60079-11.
Fig 1 FISCO fieldbus system
4.2 Ex ia entity systems
The BA444DF-P Fieldbus Indicator has Ex ia
certification with entity parameters for applications
in Zone 0, 1 and 2.
The BA444DF-P Fieldbus Indicator may be
connected to any intrinsically safe segment
providing:
The device powering the fieldbus segment is
ATEX Ex ia certified for Zone 0, 1 or 2
applications, or Ex ib certified for application
in Zone 1 or 2, or Ex ic certified for
applications in Zone 2. The output
parameters of the segment should be equal
to or less than:
Uo = 22V dc
Io = 250mA dc
Po = 1.2W
The segment can provide an additional 13mA
to power the Fieldbus Indicator.
The equivalent capacitance Ci of the
BA444DF-P Fieldbus Indicator is zero and
the equivalent inductance is insignificant.
Therefore these BA444DF-P parameters do
not need to be considered.
4.3 Ex ic entity systems
The BA444DF-P Fieldbus Indicator also has Ex ic
certification with entity parameters for applications
in Zone 2. The higher Ui voltage allows the
indicator to be used with segment couplers
powered by Ex e or Power-i fieldbus trunks.
When mounted in Zone 2 the BA444DF-P Fieldbus
Indicator may be connected to any intrinsically safe
segment providing:
The device powering the fieldbus segment is
ATEX Ex ia, ib or ic certified and has output
parameters equal to or less than:
Uo = 32V dc
Io = 125mA dc
Po = 1W
The segment can provide an additional 13mA
to power the Fieldbus Indicator.
The equivalent capacitance Ci of the
BA444DF-P Fieldbus Indicator is zero and
the equivalent inductance is insignificant.
Therefore these BA444DF-P parameters do
not need to be considered.
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