4
2.1 Controls
Both models are controlled and calibrated via four
front panel push buttons which may be operated
while the indicator is energised in a hazardous
area.
In the display mode i.e. when the indicator
is displaying a process variable, these push
buttons have the following functions:
(
While this button is pushed the
indicator will display the input current
in mA, or as a percentage of the
instrument span depending upon how
the indicator has been configured.
When the button is released the
normal display in engineering units
will return.
&
While this button is pushed the
indicator will display the numerical
value and analogue bargraph
1
the
indicator has been calibrated to
display with a 4mA
2
input.
When
released
the
normal
display
in
engineering units will return.
*
While this button is pushed the
indicator will display the numerical
value and analogue bargraph
1
the
indicator has been calibrated to
display with a 20mA
2
input. When
released
the
normal
display
in
engineering units will return.
)
No function in the display mode
unless the tare function is being used.
(
+
&
Indicator displays firmware number
followed by version.
(
+
)
Provides access to the configuration
menu via optional security code.
Notes:
1
Only the BA324SG has a bargraph
2
If
the
indicator
has
been
calibrated
using
the
CAL
function, calibration
points
may not be 4 and 20mA.
3. CERTIFICATION
Both models have IECEx and ATEX Ex eb
increased safety and Ex tb dust ignition protection
by enclosure certification.
This section of the instruction manual describes
IECEx and ATEX Ex eb certification for installation
in gas hazardous areas.
Ex tb certification for
installation in dust hazardous areas is described in
Appendix 1.
3.1 IECEx and ATEX Ex eb certification
Increased safety Ex eb is a type of electrical
equipment protection which provides increased
security against the possibility of excessive
temperatures and against the occurrence of arcs
and sparks.
The requirements are defined by
international standard IEC 60079-7 which is
published in the UK as BS EN 60079-7.
To allow the BA304SG and BA324SG to be
installed in Zone 1, both indicators incorporate an
encapsulated Ex mb assembly. This encapsulated
assembly has an intrinsically safe Ex ib output
which powers the display and optional display
backlight.
Certification Body Intertek Testing and Certification
Ltd have issued both models with a common
Certificate of Compliance
IECEx ITS 19.0018X
Ex eb ib mb IIC T5 Gb
-40°C ≤ Ta ≤ +60°C
Intertek have also issued an ATEX EU - Type
Examination Certificate:
ITS19ATEX304891X
II 2G Ex eb ib mb IIC T5 Gb
- 40°C ≤ Ta ≤ +60°C.
Note:
Types of protection on both certificates are
listed in alphabetical order.
The ATEX certificate confirms compliance with
harmonised European standards which has been
used to support a manufacturer's Declaration of
Conformity
confirming
compliance
with
the
European
ATEX
Directive
for
Group II,
Category 2GD equipment.
The indicators carry the community mark and,
subject to local codes of practice, may be installed
in any of the European Economic Area (EEA)
member countries.
ATEX certificates are also
acceptable for installations in Switzerland and
some other countries - see Blue Book.
This section of the instruction manual describes
installations
in
explosive
gas
atmospheres
conforming
with IEC / EN 60079-14
Electrical
installations design, selection and erection
. When
designing systems for installation outside the UK
the local Code of Practice should be consulted.
For more information about the certification
techniques employed in these indicators, please
see BEKA Application Guide AG320 which may be
viewed and downloaded from the BEKA website
www.beka.co.uk
