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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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