Fire Fighting Enterprises IR3 User Manual

This document is the Exd Flame Detector Installation Guide/2010/Issue 3

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Flameproof – (Ex d)

IR² and IR³ Flame Detector

Installation Guide

General

This Installation Guide gives information on the Flameproof (Ex d) version of the flame
detectors that have been approved by Baseefa. The requirements of the European Community
Directive 94/9/EC, the ATmosphere EXplosives ATEX Directive have been met. The approval
has been accessed to the following European Standards EN60079-0, EN 60079-1 and EN
60079-26.

Also the flame detector has been accessed and approved to IECEx requirements.

The detector enclosures are certified category II 2 G D, Ex d IIC T4 Gb

Ex tb IIIC T135°C Db IP66 A21

Tamb = -40°C to +125°C

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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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
most valuable when high power levels are unavoidable but it is not acceptable for areas in
which an explosive gas/air mixture may be continuously present or present for long periods.

For this reason these flame detectors are made intrinsically safe rather than flameproof.
Intrinsically safe equipment operates at such low power and with such small amounts of stored
energy that it is incapable of causing ignition:

o In normal conditions
o With a single fault (for ib type of protection code)
o With any combination of two faults (for ia type of protection code)

In any of these conditions every component must remain cool enough not to ignite gases for
which it is approved. See Table 4

Classification of Hazardous Areas

EN 60079-0 (formally EN50014) states that electrical apparatus for potentially explosive
atmospheres is divided into:

• Gas Group I:

• Gas Group II:

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).

Electrical apparatus for mines susceptible to fire damp;
Electrical apparatus for places with a potentially explosive atmosphere,

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