This document is the EExd Flame Detector Installation Guide/2013/Issue 2
Flameproof – (EExd)
UV/ IR² Flame Detector
Installation Guide
General
This Installation Guide gives information on the Flameproof (EExd) version of the flame
detectors that have been approved by ISSeP (Institut Scientifique de Service Public; notified
body number:492). The requirements of the European Community Directive 94/9/EC, the
ATmosphere EXplosives ATEX Directive have been met. The approval has been accessed by
reference to the following standards, EN50014:1997+A1 and A2:1999, EN 50018:2000 and pr
AA EN 50018 plus a review against EN60079-1:2004 which showed that there were no
changes which materially affected the “state of technological progress” with respect to the
product. EN50281-1-1:1998
The detector enclosures are certified category II 2 G D, EExd IIC T6 IP66.
The range comprises dual infra-red (IR²), triple infra-red (IR³) and UV/IR² flame detectors. The
detector housings are available in copper free aluminium alloy (LM25) and stainless steel
(316).
The guide also provides information on Flameproof (type‘d’) enclosures, the application,
maintenance, installation and adjustments of the detectors. Reference to other individual
detector publications can be made for more information on none Flameproof issues. These
publications are available on request.
Information in this guide is given in good faith, but the manufacturer cannot be held responsible
for any omissions or errors. The company reserves the right to change the specifications of
products at any time and without prior notice.
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1
Introduction to Flameproof Enclosures
There are many places where an explosive mixture of air and gas or vapour is or may be
present, intermittently or as a result of an accident. These are defined as hazardous areas by
EN 60079-0 (formally EN 50014), Electrical apparatus for explosive gas atmospheres –
General requirements.
Hazardous areas are common in petroleum and chemical engineering plants and in factories
processing and storing gases, solvents, paints and other volatile substances.
Electrical equipment for use in these areas needs to be designed so that it cannot ignite an
explosive mixture, not only in normal operation but also in fault conditions. There are a number
of methods available to achieve this – oil immersion, pressurised apparatus and powder filling,
for example, but the two most common used are intrinsic safety and flameproof enclosures.
Flameproof equipment is contained in a box so strong that an internal explosion will neither
damage the box nor be transmitted outside the box. The surface must remain cool enough not
to ignite the explosive mixture.
When flameproof equipment is interconnected, flameproof wiring must be used. This method is
helpful for installations in areas were explosive gas/air mixture are not present continuously or
not present for long periods.
Classification of Hazardous Areas
EN 60079-0 (formally EN50014) states that electrical apparatus for potentially explosive
atmospheres is divided into:
• Group I: Electrical apparatus for mines susceptible to fire damp;
• Group II: Electrical apparatus for places with a potentially explosive atmosphere,
other than mines susceptible to fire damp.
These flame detectors are designed to meet the requirements of Group II apparatus. For the
type of protection “d” Flameproof, Group II is subdivided into Equipment Categories, Type of
Explosive Atmosphere (Table 1), Type of Protection Code (Table 2), Temperature Class (Table
3) and Gas Group (Table 4).
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11
EExd System Drawing
Hazardous Area Safe Area
Flame Detector
1
+
2
-
Flame Detector
Flame Detector
Fire
Relay
Fault
Relay
Fire
Relay
Fault
Relay
1
+
2
-
5
6
7
8
1
+
2
-
5
6
7
8
EOL
Refer to note 6
Safe Area Apparatus
Unspecified except that it
must not be supplied from
nor contain under normal or
abnormal conditions a source
of potential exceeding 250V
RMS or 250V DC with
respect to earth.
+
No
i
Barrier
Required
- -
+
No
-
Barriers
+
Required
-
NOTE 1
WARNING – Ensure ALL power is OFF before/during
installation/maintenance.
NOTE 2
Ensure the details on the enclosure label comply with
the hazardous area specified.
NOTE 3
The installation must comply with national installation
requirements (for example to EN 60079-14)
NOTE 4
If required a loading resistor or end of line device (EOL)
can be connected between the detector terminals of any
circuit. The total power dissipation and temperature
classes within the enclosure must not be exceeded,
30W – T6.
24V DC Normal
+
(Break supply to reset
if detector set to latch)
i = See detector data
sheet for details
24V DC Normal
+
(Break supply to reset
if detector set to latch)
-
+
Zone
-
Equipment Markings
ATEX
CE Marking
EU Explosive
Atmosphere
Symbol
Equipment
Definition
Category
1 - very high level of protection
in which explosive atmosphere mixtures of air gases,
vapours or mist are present continuously, for long
periods
2 - high level of protection
in which explosive atmosphere mixture of air and gases,
vapours or mist are likely to occur
3 - normal level of protection
in which explosive atmosphere mixtures of air and
gases, vapours or mist are unlikely to occur and if it
occurs it will exist only for a short period
These Flame Detectors are suitable for equipment categories 2 and 3, G or D.
Note: The detectors are not certified for category 1 areas, see ‘IS’ products.
Table 1 Equipment Categories and Type of Explosive Atmosphere (Group II)
(EU Directive 94/9/EC)
II 2 G D
Type of Explosive
Atmosphere
G D - dust
Group II
Group II
gas vapour mist
Zone
0
1
2
10
3
CENELEC / IEC
Conformity with
European Standards.
IEC marking omits
this character
E Ex d IIC T6
Explosion Protection
symbol
Code
These Flame Detectors are approved ‘d’.
Table 2 Type of Protection Codes Table 3 Temperature Classification
Type of
Protection Code
ia Intrinsic safety 1
ib Intrinsic safety 2
d Flameproof 2
Equipment
Category
Gas Group Representative Gas Other Gases, Liquids, Vapours
IIC
IIB
IIA
These Flame Detectors are approved IIC for listed gases in EN 50014.
Table 4 Subdivisions of Group II Gases
Hydrogen Acetylene, Carbon Disulphide
Ethylene Diethyl ether, Tetrafluoroethylene
Methane Butane, Methanol, Petroleum, Propane, Styrene
Temperature
Class
Referred to
ambient of
-20°C to +40°C
T6 85°C
T5 100°C
T4 135°C
T3 200°C
T2 300°C
T1 450°C
Detectors approved to T6.
Maximum
Surface
Temperature
Health and Safety at Work Act
In the UK all equipment must be installed and disposed of (as required) within the legislative
requirements of the Health & Safety at Work Act 1974.
Installation
No modification should be made to the enclosure without reference to the manufacturer as
unauthorised modification to an approved enclosure will invalidate the certificate/approval.
1. The enclosures are supplied with drilled and tapped entries. See enclosure drawing
2. The surface of the machined/threaded flamepaths between cover and body must be
3. Before the cover is refitted, the flamepath/threaded joint between cover and body must
4. Threaded covers must be screwed on to a minimum of 5 full threads of engagement and
5. All tapped entries must be fitted with an approved flameproof (EExd) device which is
6. The enclosure should be mounted using the two rear M6 tapped holes.
7. Do not scratch the glass.
8. Glanding of cables should be as in Selection of Cable Gland section.
protected from scratches or damage during installation. Any such damage can destroy
the validity of the enclosure.
be thoroughly wiped clean of dirt, grit or other foreign substances, and then a thin
coating of an approved form of non-setting grease applied to joint/threads. Ensure the
gasket o-ring is free from damage.
then locked in position with the locking screw provided.
equivalent or superior to the gas group of the enclosure.
Enclosure with Front Cover Removed
1 2 3 4 5 6 7 8
JCE EExd HOUSING EMH29
WITH FRONT REMOVED.
FLAME SENSOR
ELECTRONIC MODULE.
FLAME SENSOR
CONNECTION TERMINALS.
4
9
.
A1A1A2 A3A
Selection of Cable Glands
Application of barrier glands certified and approved to meet EN 60079-14 for Thermo Plastic,
Thermosetting and Elastomeric Cables.
Hazardous Area Type Gland Method
Zone 1, 2 21 & 22 Hazardous areas requiring IIC
1)
apparatus
Zone 2 & 22 Hazardous areas requiring IIA & IIB
2)
EExd Barrier Glands
mandatory
Any EExd Gland permitted
apparatus.
Table 5 Examples of barrier glands
Enclosure Details
UNITS: mm.
86
150
146
Entry Thread Type – A1, 2 & 3
3 off – M20 x 1.5
B
100
150
B
27
110
2 & 3
Fixing Holes – B
2 off – M6 (8mm deep)
Flameproof Products
Flameproof Flame Detector
(Alloy 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
Housing Colour: Red
Housing
Dimension:
(Excluding Mount)
Cable Gland
Entries:
Electrical
Supply In:
Voltage
Current
Polarity sensitive
Optional Input:
Voltage
Current
Polarity sensitive
Power Up Time: 2 seconds
Relays
Contact Ratings:
Voltage
Current
Power
Resistive Loads Only
Environmental
Operating Ambient
Temperature:
ATEX
Approval Category
CENELEC / IEC
Marking
Apparatus
Certificate Number ISSeP 03ATEX012
IP Rating IP66
Copper Free
Aluminium Alloy
LM25
Height = 150mm
Width = 146mm
Depth = 137mm
3 X 20mm
Terminals 1(+) & 2(-)
14 to 30Vdc
2 to 28mA
Terminals 3(+) & 4(-)
See data
sheet for detail
14 to 30Vdc
typ. @ 24V IN
40µA
Terminals 5 to 8
30Vdc. Max.
1 Amp. Max.
30W Max.
Check detector data
sheet.
II 2 G D
EEx d IIC T6
Zone 1, 21, 2 & 22
8
5
Flameproof Flame Detector
(Stainless Steel Housing)
Fig. 2
Technical Data
Mechanical
Housing Material:
See figure 2
Housing Colour: Natural
Housing
Dimension:
(Excluding Mounts)
Cable Gland
Entries:
Electrical
Supply In:
Voltage
Current
Polarity sensitive
Optional Input:
Voltage
Current
Polarity sensitive
Power Up Time: 2 seconds
Relays
Contact Ratings:
Voltage
Current
Power
Resistive Loads Only
Environmental
Operating Ambient
Temperature:
ATEX
Approval Category
CENELEC / IEC
Marking
Apparatus
Certificate Number ISSeP 03ATEX012
IP Rating IP66
6
316 Stainless Steel
Height = 150mm
Width = 146mm
Depth = 137mm
3 X 20mm - typical
Terminals 1(+) & 2(-)
14 to 30Vdc
2 to 28mA
Terminals 3(+) & 4(-)
14 to 30Vdc
typ. @ 24V IN
40µA
Terminals 5 to 8
30Vdc. Max.
1 Amp. Max.
30W Max.
Check detector data
sheet.
II 2 G D
EEx d IIC T6
Zone 1, 21, 2 & 22
See data
sheet for detail
System Design
Engineers familiar with codes of practice for
hazardous area systems should only
undertake the design of an flameproof fire
detection system. In Europe the standard is
EN 60079-0 (formally EN 50014), Electrical
apparatus for potentially explosive
atmospheres – General requirements.
The fire detector performance is the same as
the standard none flameproof counterparts.
Performance information given in standard
product guides is therefore applicable to the
flameproof range.
The ISSeP certification of the flameproof
device enclosure covers their characteristics
as components of a flameproof system. This
indicates that the flame detectors can be
used with a margin of safety in such
systems.
Service & Repairs
1. Frequent inspection should be made. A schedule for the maintenance check should be
determined by the environment and frequency of use but should be regular enough to
ensure the detector continues to operate in the designed manner. It is recommended that
Servicing of the fire protection system should be carried out as recommended by the local regulation
in force.
it should be at least once a year.
2. External surfaces of the enclosure should be periodically cleaned to ensure dust deposits
are not allowed to accumulate.
3. Check flamepath/threads on enclosure body and lid for signs of corrosion. If badly pitted,
replace component.
4. All components that are replaced must be in accordance with the manufactures
specification. Failure to use such components may invalidate the certication/approval on
the enclosure and may make the enclosure dangerous.
5. After inspection and maintenance have been carried out, items 3 & 4 of the installation
instructions should be adhered to when resealing the enclosure.
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