BEKA BA448CF-P, Инструкция по установке и обслуживанию, Страница: 6 / 25

4
Be used with gases in groups:
Group A propane
Group B ethylene
Group C hydrogen
Having a temperature classification of:
T1 450oC
T2 300oC
T3 200oC
T4 135oC
At an ambient temperature between –40 and
+70
o
C.
Note: minimum guaranteed operating temperature
is –20ºC.
3.3 Fieldbus connection
The BA448CF-P Indicator is powered and
communicates via the fieldbus, which is connected
to terminals 1 and 2. These are non-polarised,
comply with the Fieldbus Intrinsically Safe Concept
(FISCO) defined in EN 60079 Part 27 and have
separate entity parameters shown below:
FISCO Entity
Ui = 17.5V dc 22.0V dc
Ii = 380mA dc 250mA dc
Pi = 5.32W 1.2W
The maximum equivalent capacitance and
inductance at terminals 1 & 2 is:
Ci = 0
Li = 8µH
3.4 Certification Label Information
The certification information label is fitted to the top
outer surface of the enclosure. It shows details of
the ATEX certification and a statement that the
instrument is a FISCO Field Device, plus BEKA
associates name and location. IECEx approval
information is also included. The label may also
contain non-European certification information.
The instrument serial number and year of
manufacture are shown on the rear panel adjacent
to the terminals.
4. SYSTEM DESIGN FOR HAZARDOUS
AREAS
4.1 FISCO Systems
The BA448CF-P may be connected to any ATEX
certified FISCO compliant fieldbus segment,
providing the segment can supply the additional
13mA required to power 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 to EN 60079 part 27.
Fig 1 FISCO fieldbus system
4.2 Non-FISCO Systems
For non-FISCO applications the BA448CF-P
Fieldbus Indicator has a higher voltage entity
intrinsic safety input parameter allowing connection
to a wide range of fieldbus segments.
The BA448CF-P Fieldbus Indicator may be
connected to any intrinsically safe segment
providing:
The device powering the fieldbus segment is
ATEX certified and has output parameters
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.
Note: The equivalent capacitance Ci of the
BA448CF-P Fieldbus Indicator is zero and
the equivalent inductance is insignificant.
Therefore
these BA448CF-P safety
parameters do not need to be considered.