4
Up
While this button is pushed the
indicator will display the number which
the indicator has been calibrated to
display with a 20mA input. When
released the normal display in
engineering units will return.
E
No function in the display mode.
3. TYPE 'nL' CERTIFICATION
3.1 Certificate of Conformity
ITS Testing and Certification Ltd. (formerly ERA
Technology Ltd) has issued a Certificate of
Conformity Ex99Y4004 confirming that the
BA324ND complies with the CENELEC standard
BS EN50021:1999. This European standard
specifies the requirements for the construction,
testing and marking of Group II electrical apparatus
with type of protection 'n' intended for use in Zone
2, where an explosive atmosphere of gas is
unlikely to occur, or if it does occur will be
infrequent or remain for short periods only.
3.2 ATEX certification
The BA324ND complies with the European ATEX
Directive 94/9/EC for Group II, Category 3G
equipment. It has been assessed using the
'Internal Control of Production' procedure specified
in Annex 8 of the Directive. A technical dossier
has been prepared and an EC Declaration of
Conformity BEKA00ATEX0010 has been issued.
The instrument bears 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.
This manual describes installations which conform
with BS EN60079:Part 14 Electrical Installation in
Hazardous Areas. When designing systems for
installation outside the UK, the local Code of
Practice should be consulted.
3.3 4/20mA input terminals
Input terminals 1 and 3 may be safely connected in
series with any 4/20mA loop providing that in
normal operation the input current to the indicator
(Ii) does not exceed 30mA dc.
3.4 Zones, gas groups and T rating
The BA324ND has been certified as Group II,
Category 3G Ex nL IIC T5 apparatus with a Tamb
of -20 to 60°C.
'L' indicates that the BA324ND uses an energy-
limiting technique to achieve compliance as
defined in EN 60079-15. This technique is based
on the philosophy of
intrinsic safety
which limits the
current and voltage applied to components which
may generate a spark in normal operation. e.g.
switches and potentiometers.
These approvals confirm that the BA324ND is 'safe
in normal operation' and may be:
Installed in a Zone 2 hazardous area
Used at ambient temperature between
-20 and +60°C
Used with gases in groups:
Group A
propane
Group B
ethylene
Group C
hydrogen
Used with gases having a temperature
classification of:
T1
450°C
T2
300°C
T3
200°C
T4
135°C
or
T5
100°C
This allows the BA324ND indicator to be installed
in Zone 2 low risk hazardous areas, and to be
used with most common industrial gases.
3.5 Certification Label Information
ATEX certification information is shown on a label
fitted in a recess on the top outer surface of the
enclosure. Non European certification information
may also be included. The instrument serial
number and date of manufacture are shown on a
separate label inside the terminal compartment.
