5
this can be done without contaminating the interior
of the instrument with dust or moisture. Some end-
users may prefer not to permit live maintenance to
minimise risk.
The indicator's front panel push button contacts
are non incendive and have been certified
intrinsically Ex ic as shown on the Type
Examination Certificate. This allows the indicators
to be adjusted and configured live when installed in
a panel enclosure located in Zones 2 or 22.
When connected to a suitable system and
correctly mounted in a panel enclosure complying
with the requirements for Type of protection 'n', the
panel enclosure containing the BA307NE or
BA327NE may be installed in:
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 safely be used with
equipment having a temperature classification
of:
T1
450
o
C
T2
300
o
C
T3
200
o
C
T4
135
o
C
T5
100
o
C
At ambient temperatures between -40 and +70
o
C.
This allows use with
all commonly used industrial
gases except carbon disulphide CS
2
.
3.3 4/20mA input
The input safety parameters for the 4/20mA input,
terminals 1 and 3 are:
Ii
=
200mA
The indicators are current input instruments
incorporating an internal protection circuit that
defines the voltage developed between the input
terminals 1 and 3, therefore the ATEX certificate
does not specify a maximum safety input
voltage Ui.
3.4 Certification label information
The certification label is fitted in a recess on the
top of the instrument. It shows the ATEX
certification information, BEKA associates name
and location, year of manufacture and the
instrument serial number. IECEx certification
information is also be shown.
BA307NE certification label
