BEKA BA314E, Manual

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3. INTRINSIC SAFETY CERTIFICATION
The BA314G has 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 the BA314G with an EU-Type
Examination Certificate number ITS16ATEX28408X.
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 equipment.
The Tachometer carries 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 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 BA314G Tachometer has been certified
Ex ia IIC T5 Ga. When connected to a suitable
system it 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 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 the BA314G
Tachometer is installed in Zone 1 or in Zone 2. This
allows the BA314G to be installed in all gas Zones
and to be used with most common industrial gases
except carbon disulphide and ethyl nitrite which have
an ignition temperature of 95°C.
3.3 Power supply
When installed in a hazardous area the BA314G
should be powered from a certified Zener barrier,
galvanic isolator or associated apparatus with an
intrinsically safe voltage output.
The safety parameters of terminals 1 and 2 are:
Ui = 28V dc
Ii = 200mA dc
Pi = 0.84W
Uo = 0
Io = 0
Any certified Zener barrier, galvanic isolator or
associated apparatus with output safety parameters
equal to or less than these input limits may be used.
The maximum equivalent capacitance and
inductance between terminals 1 and 2 is:
Ci = 2nF
Li = 4µH
To determine the maximum permissible cable
parameters the above figures, which are small and
may be ignored in some applications, should be
subtracted from the maximum permitted cable
parameters specified for the Zener barrier, galvanic
isolator or associated apparatus powering the
BA314G Tachometer.
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