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Maximum loading of is circuit, Installation, Protection against lightening – Fire Fighting Enterprises Talentum IR3 Flame Detector User Manual

Page 5: Marking, Service & repairs, Intrinsically safe products

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12

Maximum Loading of IS Circuit


Because of the finite resistance of the safety
barrier, there will be a limit to the current
drain which can be tolerated before the
voltage on the circuit falls outside the
specified limits for the IS detector. The
standing current for the detectors can be

calculated by the sum of the individual
selected detector currents as given in the
detector data sheet. This will limit the
maximum number of detectors per barrier to
two.



Installation




It is important that the IS detectors are
installed in such a way that all terminals and
connections are protected to at least IP20
with the detector cover fitted. The earth
bonding terminals are provided for

convenience where continuity of a cable
sheath or similar is required.
The installation of the system must be done
in accordance with EN 60079-14.



Protection Against Lightening


The installer must perform a risk assessment
in accordance with clause 10 of EN 60079-

25 and install lightning protection arrestors
as deemed necessary.


Marking


The system shall be marked in a “strategic
position”, either on or adjacent to the

principle item of electrical apparatus, with the
following information:






Service & Repairs

Servicing of IS flame detectors may be
carried out only by a BASEEFA or equivalent
authorised body. In practical terms this
means that IS flame detector may be
serviced only at the manufactures factory.

Servicing of the fire protection system should
be carried out as recommended by the local
regulation in force.




SYST

Baseefa08Y0078

Ga Ex ia IIC T4

5


Intrinsically Safe Products
























Intrinsically Safe Flame Detector
(Polycarbonate Housing)
Fig. 1


The flame detectors respond to light emitted
from flames during combustion.
The detectors discriminate between flames
and other light sources by responding only to
low frequency flickering produced by flames
(typically 1 to 15Hz). The detectors ignore
fixed light sources and rapidly flickering
illumination predominantly produced by
lighting.

The flame flicker techniques have the

advantage of still allowing the detection of
flames through a thin layer of oil, water
vapour, ice or dust. This makes these
detectors particularly useful in industrial
applications.

Full details of the principles of operation,
electrical description, and other detailed
technical data are published in the products
individual data sheet.






Technical Data


Mechanical
Housing Material:

See figure 1

Stainless Steel &
Glass Reinforced
Polycarbonate

Housing Colour:

Blue (typical)

Housing
Dimension:

(Excluding Mount)

Height = 148mm
Width = 110mm
Depth = 63mm

Cable Gland
Entries:


4 X 20mm


Electrical
Supply In:

Voltage

Current

Polarity sensitive

Terminals 1(+) & 2(-)

14 to 30Vdc
2 to 30mA

See data

sheet for detail

Optional Input:

Voltage

Current

Polarity sensitive

Terminals 3(+) & 4(-)

14 to 30Vdc
40µA

typ. @

24V IN

Optional Output:

Voltage

Internally Limited

Current

Terminals 3(+) & 4(-)

0V to

Supply In (O/C)

2.4

mA typ

.

Optional Relays
Contact Ratings:

Resistive

Voltage

Loads Only

Current

Terminals 3 to 8

30Vdc. Max.
1 Amp. Max.


Environmental
Operating Ambient
Temperature:

Check detector limits

-20°C to +40°C(T4)

ATEX
Approval Category



II 1 G

CENELEC / IEC
Marking

Ga Ex ia IIC T4

Apparatus
Certificate Number


BAS02ATEX1001

System
Certificate Number


Baseefa08Y0078


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