BEKA BA314NG, Manual

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3. CERTIFICATION
The BA314NG has ATEX and IECEx Ex nA gas and
Ex tc dust certification. The main sections of this
instruction manual describes ATEX gas certification.
ATEX dust certification is described in Appendix 1 and
IECEx gas and dust certification in Appendix 2. ETL
and cETL certification for installations in the USA and
Canada are described in Appendix 3.
3.1 ATEX Ex nA certification
Notified Body Intertek Testing and Certification Ltd
have issued the BA314NG with a Type Examination
Certificate number ITS16ATEX48409X. This has
been used to confirm compliance with the European
ATEX Directive for Group II, Category 3G equipment.
The instrument carries the Community Mark and,
subject to local codes of practice, may be installed in
any of the European Economic Area (EEA) member
countries and in the EEA EFTA states, Iceland,
Liechtenstein and Norway. ATEX certificates are also
acceptable in Switzerland and Turkey. The European
Commission's Blue Guide lists the member states,
overseas countries and territories that have adopted
harmonisation legislation.
This section of the instruction manual describes ATEX
installations in explosive gas atmospheres conforming
with 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.
3.2 Zones, gas groups and T rating
The Tachometer has been certified as Group II
Category 3G Ex ic nA IIC T5 Gc –40°C
≥ Ta ≥ +60°C
apparatus. This is non-sparking apparatus complying
with EN 60079-15
Equipment protection by type of
protection 'n' that minimises the risk of arcs or sparks
capable of creating an ignition hazard occurring during
conditions of normal operation.
The Tachometer's front panel push button contacts
are non incendive and have been certified intrinsically
safe Ex ic without the need for Zener barriers or
galvanic isolators as shown on the Type Examination
Certificate. This allows the Tachometer to be adjusted
and configured live when installed in Zones 2.
When connected to a suitable system the BA314NG
Tachometer 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 +60 o C.
This allows use with all commonly used industrial
gases except carbon disulphide CS
2
.
3.3 Safety parameters
The certificate specifies input safety parameters in
normal operation i.e. without faults for all the
instrument terminals. Where only a voltage or a
current is specified, the unspecified parameter will
be defined by components within the instrument.
3.4 Special conditions for safe use
Special conditions for safe use are specified by the
Ex nA certificate indicated by the certificate number's
'X' suffix. These state that the BA314NG
Tachometer should be:
a. Supplied from a limited energy circuit with
output parameters in normal operation equal
to, or less than the instrument’s input
parameters. The certificate states that It is
not necessary to power the instrument from
an intrinsically safe interface, such as a
certified shunt diode safety barrier or a
galvanic isolator to comply with this
requirement.
b. Fitted with cable entry glands or conduit
fittings which maintain the impact and ingress
protection of the enclosure. Certified Ex e or
Ex n components satisfy these requirements.
The BA334E is supplied fitted with one
certified M20 stopping plug and one
temporary hole plug which should be replaced
with the required gland or conduit fitting.
3.5 Power supply
The input safety parameters for the power supply
terminals 1 and 2 are:
Ui = 30V dc
Ii = 100mA
This allows the BA314NG to be powered from any
dc supply which in normal operation has an output
of less 30V and 100mA. See section 4.1 for power
supply recommendations.
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