BEKA BA364E, Руководство пользователя

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3. INTRINSIC SAFETY CERTIFICATION
The BA364G Counter has ATEX, IECEx and ETL
gas and dust certification.
This section of the
instruction manual describes ATEX gas certification.
Dust, IECEx and other approvals are each described
in separate appendixes to this manual.
3.1 ATEX gas certification
Notified Body Intertek Testing and Certification Ltd
have issued the BA364G 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.
The Counter
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 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
The BA364G Counter has been certified
Ex ia IIC T5 Ga -40ºC ≤ Ta ≤ +70ºC. 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
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.
The specified operating temperature of the BA364G
Counter is -40 to +70°C. At temperatures below -
20°C the instrument will continue to count, but the
display digits will change increasingly slowly and the
contrast will be reduced.
This allows the BA364G Counter 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 Special conditions for safe use
The ATEX certificate has an ‘X’ suffix indicating that
special conditions apply for 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 BA364G
Counter is installed in Zone 1 or in Zone 2.
3.4 Power supply
When installed in a hazardous area the BA364G
Counter should be powered via a certified Zener
barrier or galvanic isolator from a dc supply located
in the safe area, or from associated apparatus with
an intrinsically safe output.
The input safety parameters of terminals 1 and 2 are:
Ui = 28V dc
Ii = 200mA dc
Pi = 0.84W
Any certified Zener barrier or galvanic isolator with
output safety parameters equal to or less than these
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 many applications, should be
subtracted from the maximum permitted cable
parameters specified for the Zener barrier or
galvanic isolator powering the BA364G Counter.
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