4
2.1
Controls
All models are controlled and calibrated via four
front panel push buttons.
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. The function of this push
button is modified when optional
alarms are fitted to the indicator.
&
While this button is pushed the
indicator will display the numerical
value and analogue bargraph* the
indicator has been calibrated to
display with a 4mA
Φ
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* the
indicator has been calibrated to
display with a 20mA
Φ
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 direct access to the alarm
setpoints when the indicator is fitted
with optional alarms and the
AC5P
access setpoints function has been
enabled.
(
+
)
Provides access to the configuration
menu via optional security code.
Note:
* BA324G and BA324G-SS only
Φ
If
the
indicator
has
been
calibrated
using
the
CAL
function, calibration
points
may
not be 4 and 20mA.
3.
INTRINSIC SAFETY CERTIFICATION
All models have ATEX and IECEx gas and dust
certification. This section of the instruction manual
describes ATEX gas certification. ATEX dust and
IECEx approvals are described in Appendixes 1
and 2.
3.1
ATEX gas certification
Notified Body Intertek Testing and Certification Ltd
have issued all the models with a common
EC-Type
Examination
Certificate
number
ITS11ATEX27253X.
This confirms compliance
with harmonised European standards and it has
been used to confirm compliance with the
European
ATEX
Directive
for
Group II,
Category 1G
equipment,
Ex ia IIC T5 Ga
Ta = - 40°C to +70°C.
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
ATEX installations in explosive gas atmospheres
conforming
with
EN60079-14
Electrical
installations design, selection and erection
. When
designing systems for installation outside the UK
the local Code of Practice should be consulted.
3.2
Zones, gas groups and T rating
All models have been certified Ex ia IIC T5. When
connected to a suitable system they 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
In gases that may be used with equipment having
a temperature classification of:
T1
450°C
T2
300°C
T3
200°C
T4
135°C
T5
100°C
At ambient temperatures between -40 and +70°C.
CAUTION installation in Zone 0
When a BA304G or BA324G GRP instrument is
installed
in
a
Zone
0
potentially
explosive
atmosphere
requiring
EPL Ga
apparatus,
the
instrument shall be installed such that even in the
event of rare incidents, an ignition source due to
impact or friction between the aluminium label and
iron/steel is excluded.
No special conditions apply when a GRP indicator
is installed in Zone 1 or in Zone 2, or for Stainless
steel indicators.
