4
3.2 Zones, gas groups and T rating
The BA444DF-F has been issued with EC Type
Examination
certificate
ITS06ATEX25313
confirming that it complies with the requirements
for Group II Category 1G Ga Ex ia IIC T4
Tamb = –40 to 70ºC specified in the ATEX
Directive. When connected to a suitable certified
system the BA444DF-F may be installed in:
Zone 0
explosive gas air mixture
continuously present.
Zone 1
explosive gas air mixture
likely to occur in normal
operation.
Zone 2
explosive gas air mixture not
likely to occur, and if it does will
only exist for a short time.
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 & +70ºC.
Note: minimum guaranteed operating temperature
is –20ºC.
This allows the BA444DF-F fieldbus indicator to be
installed in all Zones and to be used with most
industrial gases.
3.3 Fieldbus connection
The BA444DF-F Indicator is powered and receives
data via the H1 fieldbus, which is connected to
terminals 1 and 2. These terminals are non-
polarised, comply with the Fieldbus Intrinsically
Safe Concept (FISCO) defined in IEC 60079 Part
27 and also have separate entity parameters as
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
= 0nF
Li
= 8µH
3.4 Certification Label Information
The certification information label is fitted in a
recess on the top outer surface of the enclosure. It
shows details of the ATEX certification, a
statement that the instrument is a FISCO Field
Device, plus BEKA associates name and location.
IECEx approval information is also included. The
label for some versions of the instrument will also
contain non-European certification information.
The instrument serial number and year of
manufacture are recorded on a separate label
inside the terminal compartment.
4. SYSTEM DESIGN FOR HAZARDOUS
AREAS
4.1 FISCO Systems
The BA444DF-F 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 part 27.
Fig 1 FISCO fieldbus system
