Bsi bs en 60079 29 4 2010

BSI Standards PublicationExplosive atmospheres Part 29-4: Gas detectors — Performance requirements of open path detectors for flammable gases... - - Electromagnetic compatibility - Elect

BSI Standards Publication

Explosive atmospheres

Part 29-4: Gas detectors — Performance requirements of open path detectors for flammable gases

This British Standard is the UK implementation of EN 60079-29-4:2010 It is identical to IEC 60079-29-4:2009, incorporating corrigendum August 2010

BS EN 50241-2:1999, which are withdrawn

The UK participation in its preparation was entrusted by Technical Committee GEL/31, Equipment for explosive atmospheres, to Subcommittee GEL/31/19, Gas detectors

A list of organizations represented on this committee can be obtained on request to its secretary

This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application

© BSI 2011 ISBN 978 0 580 72991 1 ICS 13.320; 29.260.20

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2010

It supersedes BS EN 50241-1:1999 and

The CENELEC common modifications have been implemented at the priate places in the text The start and finish of each common modification

is indicated in the text by tags

Amendments/corrigenda issued since publication

Date Text affected

31 July 2011 Implementation of IEC corrigendum

modification to clause 5.2.4.3

August 2010:

Central Secretariat: Avenue Marnix 17, B - 1000 Brussels

© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members

Ref No EN 60079-29-4:2010 E

English version

Explosive atmospheres - Part 29-4: Gas detectors - Performance requirements of open path detectors for flammable gases

(IEC 60079-29-4:2009)

Atmosphères explosives -

Partie 29-4: Détecteurs de gaz -

Exigences d'aptitude à la fonction

des détecteurs de gaz inflammables

à chemin ouvert

(CEI 60079-29-4:2009)

Explosionsfähige Atmosphäre - Teil 29-4: Gasmessgeräte - Anforderungen an das Betriebsverhalten von Geräten mit offener Messstrecke für die Messung brennbarer Gase (IEC 60079-29-4:2009)

This European Standard was approved by CENELEC on 2010-04-01 CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member

This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified

to the Central Secretariat has the same status as the official versions

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom

The combined texts were approved by CENELEC as EN 60079-29-4 on 2010-04-01

EN 60079-29-4:2010 supplements and modifies the general requirements of EN 60079-0 Where a requirement of this standard conflicts with a requirement of EN 60079-0, the requirement of this standard shall take precedence

This European Standard supersedes EN 50241-1:1999 + A1:2004 and EN 50241-2:1999

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN and CENELEC shall not be held responsible for identifying any or all such patent rights

The following dates were fixed:

– latest date by which the amendment has to be implemented

at national level by publication of an identical

national standard or by endorsement (dop) 2011-01-01

– latest date by which the national standards conflicting

with the amendment have to be withdrawn (dow) 2013-04-01

Annexes ZA, ZZ and ZY have been added by CENELEC

Endorsement notice

The text of the International Standard IEC 60079-29-4:2009 was approved by CENELEC as a European Standard with agreed common modifications as given below

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

ISO 6142 NOTE Harmonized as EN ISO 6142

ISO 6144 NOTE Harmonized as EN ISO 6144

ISO 6145 NOTE Harmonized as EN ISO 6145

- - Electromagnetic compatibility - Electrical

apparatus for the detection and measurement

of combustible gases, toxic gases or oxygen

- - Electrical apparatus for the detection and

measurement of combustible gases, toxic gases or oxygen - Requirements and tests for apparatus using software and/or digital technologies

IEC 60079 Series Explosive atmospheres EN 60079 Series

IEC 60079-0 - Explosive atmospheres -

Part 0: Equipment - General requirements EN 60079-0 -

IEC 60079-29-1

(mod) - Explosive atmospheres - Part 29-1: Gas detectors - Performance

requirements of detectors for flammable gases

EN 60079-29-1 -

IEC 60825-1 - Safety of laser products -

Part 1: Equipment classification and requirements

EN 60825-1 -

Annex ZY (informative) Significant changes between this European Standard and EN 50241-1:1999

and EN 50241-2:1999

This European Standard supersedes EN 50241-1:1999 and EN 50241-2:1999

The significant changes with respect to EN 50241-1:1999 and EN 50241-2:1999 are as listed below

Type

editorial changes

Extension Substantial

change regarding ESR´s a

Normative references: EN 60068-2-6 (vibration), removed,

Definitions: 3 modified, 3 added, 2 removed X

General requirements 4.1 and 4.1.1 modified, 4.1.5 replaced

by 4.3 (Software-controlled equipment, new), 4.2.2.4 (low

battery indications) replaced within 4.2.4 (Fault signals, new)

X

General requirements and normal conditions for tests

modified and extended (clauses 5.1, 5.2.4.1, 5.2.4.2, 5.3.2,

5.3.3, 5.3.7, 5.3.8, 5.3.11, 5.3.12) X

Test method 5.4.2 (Unpowered storage) modified X

Test method 5.4.3 (Calibration curve) modified X X

Test method 5.4.4.1, ‘Short term drift’ test removed, replaced

with ‘Slow increase of gas volume ratio’ for equipment with

automatic drift compensation

X X

Test method 5.4.4.2 (Long term stability) modified X

Test method 5.4.4.3, Long term stability (continuous duty,

Test method 5.4.4.4, Stability (spot reading equipment only)

Test method 5.4.6 (Temperature variation) modified X

Requirements for test 5.4.6 modified X

Test method 5.4.7 removed (Pressure variation) X

Test method 5.4.7 (Water vapour interference) modified X

Requirements for test 5.4.7 modified X

Test method 5.4.8 (Vibration) modified X

Requirements for test 5.4.8 modified X

Test method 5.4.9, Drop test for portable and transportable

Type

editorial changes

Extension Substantial

change regarding ESR´s a

Test method 5.4.12, Minimum time to operate (spot reading

Test method 5.4.13 removed (Power supply interruptions etc,

now part of EMC requirement of EN 50270) X

Test method 5.4.13, Battery capacity test added X X

Test method 5.4.14 (Power supply variations) modified X

Test method 5.4.16 removed (Attenuation of radiation, now

part of 5.4.20, Long range operation) X

Requirements for test 5.4.16 (now Recovery from power

Test method 5.4.19, Partial obscuration test added X X

Requirements for test 5.4.20 (Long range operation) modified X

Labelling and marking requirements modified X

Annex A removed (atmospheric visibility) X

New Annex A added (water vapour test apparatus) X

Bibliography much reduced X

The requirements of EN 50241-2 have been incorporated

into the test methods of the new standard, thus combining

the two previous standards into one

X

a ESR = Essential Health and Safety Requirements (Annex II of Directive 94/9/EC)

General conclusion on the change of the State of the Art by this standard

CENELEC/TC 31 as the responsible committee has concluded that this new edition contains substantial

changes regarding the ESRs

Annex ZZ

(informative)

Coverage of Essential Requirements of EC Directives

This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European free Trade Association and within its scope the Standard covers only the following essential requirements given in Annex II, Clauses 1.5.5 to 1.5.8 of the EC Directive 94/9/EC: – ER 1.5.5 to 1.5.7 – the essential safety requirements for devices with a measuring function for

CONTENTS

1 Scope

2 Normative references

3 Terms and definitions

3.1 Equipment

3.2 Alarms

3.3 Signals and indications

3.4 Gaseous atmospheres

3.5 Optical equipment

3.6 Performance characteristics 14

4 General requirements 15

4.1 Detection equipment 15

4.1.1 Components 15

4.1.2 Electrical assemblies and components 15

4.1.3 Optical radiation 15

4.2 Construction 15

4.2.1 General 15

4.2.2 Indicating devices 15

4.2.3 Alarm or output functions 16

4.2.4 Fault signals 16

4.2.5 Adjustments 16

4.3 Software-controlled equipment 17

5 Test requirements 17

5.1 Introduction 17

5.2 General requirements for tests 18

5.2.1 Samples and sequence of tests 18

5.2.2 Constructional checks 18

5.2.3 Preparation of samples 18

5.2.4 Equipment for calibration and test 19

5.3 Normal conditions for test

5.3.1 General

5.3.2 Operating distance for laboratory tests

5.3.3 Test gases

5.3.4 Test gas integral concentrations

5.3.5 Voltage

5.3.6 Ambient temperature

5.3.7 Ambient humidity

5.3.8 Ambient atmosphere

5.3.9 Preparation of equipment

5.3.10 Stabilization

5.3.11 Communications options 23

10 11 11 11 12 12 12 13 5.3.12 Gas detection equipment as part of systems 23

21 21 21 21 21 22 22

22 22 22 22

5.4 Test methods 23

5.4.1 Initial preparation and procedure 23

5.4.2 Unpowered storage 23

5.4.3 Calibration curve (not applicable to alarm only equipment with fixed settings) 23

5.4.4 Stability 24

5.4.5 Alarm reliability 24

5.4.6 Temperature variation 25

5.4.7 Water vapour interference 26

5.4.8 Vibration 26

5.4.9 Drop test for portable and transportable equipment 27

5.4.10 Alignment 27

5.4.11 Time of response 28

5.4.12 Minimum time to operate (spot-reading equipment) 28

5.4.13 Battery capacity 28

5.4.14 Power supply variations (externally powered equipment) 29

5.4.15 Power supply interruptions and transients

5.4.16 Recovery from power supply interruption

5.4.17 Electromagnetic compatibility (EMC)

5.4.18 Beam block fault

5.4.19 Partial obscuration

5.4.20 Long range operation

5.4.21 Direct solar radiation (applicable for equipment intended for outdoor use)

6 Field verification equipment

7 Information for use 33

7.1 Labelling and marking 33

7.2 Instruction manual 33

Annex A (informative) Water vapour test apparatus 35

Bibliography 36

Figure 1 – Equipment for gas calibration and speed of response test

Figure A.1 – Water vapour test apparatus 3

30 30 30 30 31 31 32 32

20 5

EXPLOSIVE ATMOSPHERES – Part 29-4: Gas detectors – Performance requirements of open path detectors for flammable gases

1 Scope

This part of EN 60079-29 specifies performance requirements of equipment for the detection and measuring of flammable gases or vapours in ambient air by measuring the spectral absorption by the gases or vapours over extended optical paths, ranging typically from one metre to a few kilometres

Such equipment measures the integral concentration of the absorbing gas over the optical path in units such as LFL metre for flammable gases

NOTE 1 Actual values of concentration can be deduced only where it can be established that the concentration is uniform over the optical path, for example in very short optical paths (<100 mm) In such cases, the equipment is within the scope of EN 60079-29-1

NOTE 2 This standard is based upon present absorption techniques using infrared radiation Other techniques and applications may require additional test considerations (e.g pressure test)

Equipment falling within the scope of this standard is classified by the following types:

Type 1: an optical transmitter and receiver, located at either end of a path through the

atmosphere to be monitored

Type 2: an optical transceiver (i.e combined transmitter and receiver) and a suitable

reflector, which may be a topographic feature or a retroreflector, located at either end of a path through the atmosphere to be monitored

This standard is also applicable when an equipment manufacturer makes any claims regarding any special features of construction or superior performance that exceed the minimum requirements of this standard All such claims shall be verified and the test procedures should be extended or supplemented, where necessary, to verify the claimed performance The additional tests shall be agreed between the manufacturer and the test laboratory and identified and described in the test report

This standard does not apply to any of following:

a) equipment intended to provide range resolution of gas concentration (e.g Light direction and ranging (LIDAR));

b) equipment consisting of a passive optical receiver without a dedicated optical source; c) equipment intended to measure the local volumetric concentration of gas (point sensors); d) equipment intended for the detection of dusts or mists in air;

e) equipment for cross stack monitoring;

f) equipment intended for the detection of explosives; and

g) equipment intended only for the identification of individual gas or vapour components, (e.g Fourier transform infrared spectroscopy (FTIR))

This standard is applicable to equipment which is intended for use in hazardous or hazardous areas, or both Equipment for use in hazardous areas is also required to have explosion protection (see 4.1.1)

This standard applies to portable, transportable and fixed equipment intended for commercial and industrial applications

2 Normative references

The following referenced documents are indispensable for the application of this document For undated references, the latest edition of the referenced document (including any amendments) applies

EN 60079 (all parts), Explosive atmospheres

Explosive atmospheres – Part 0: Equipment – General requirements

IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance

requirements of detectors for flammable gases

EN 60079-29-1 , Safety of laser products – Part 1: Equipment classification and requirements

3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 60079-0 as well as

EN 60079-29-1 and the following apply

NOTE Additional definitions applicable to explosive atmospheres can be found in IEC 60050-426

3.1 Equipment

3.1.1

alarm only equipment

equipment which generates an alarm signal but does not have a meter or output giving a measure of the integral concentration

equipment intended to be carried by a person

NOTE Typically portable equipment will be used as a spot-reading equipment

EN 50270, Electromagnetic compatibility - Electrical apparatus for the detection and measurement of

combustible gases, toxic gases or oxygen

EN 50271, Electrical apparatus for the detection and measurement of combustible gases, toxic gases or

oxygen - Requirements and tests for apparatus using software and/or digital technologies

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3.2 Alarms

3.2.1

alarm set point

fixed or adjustable setting of the equipment that is intended to pre-set the value of integral concentration at which the equipment will automatically initiate an indication, alarm, or other output function

alarm which, once activated, requires a deliberate action to deactivate it

3.3 Signals and indications

beam blocked signal

audible, visual or other type of output which provides, directly or indirectly, a warning or indication that the optical path is obscured or that the signal detected is too weak to enable the equipment to function normally

state of the equipment other than those in which monitoring of gas concentration takes place

NOTE For example warm-up, calibration mode or fault condition

3.4.3

flammable atmosphere

mixture with air, under normal atmospheric conditions, of flammable materials in the form of gas, vapour or mist, in which, after ignition, combustion spreads throughout the unconsumed mixture

NOTE 1 This definition specifically excludes dusts and fibres in suspension in air Mists, though included in the definition, are not covered by this standard

NOTE 2 Although a mixture which has a concentration above the upper explosive limit is not a flammable atmosphere, there is a risk of creating a flammable atmosphere by dilution

NOTE 3 Normal atmospheric conditions include variations above and below reference levels of 101,3 kPa (1013 mbar) and 20 °C provided the variations have negligible effect on the explosion properties of the flammable materials

NOTE 4 For the purposes of this standard, the terms "explosive", "combustible" and "flammable" are regarded as synonymous

mathematical integral of the gas concentration along the optical path

NOTE 1 It is expressed in units of concentration multiplied by distance, e.g LFL.metre for flammable gases or ppm.metre for toxic gases

NOTE 2 100 % LFL x 1 metre = 1 LFL.metre;

path traversed by optical radiation from an optical transmitter to an optical receiver

NOTE The radiation may traverse the open path once, twice or many times depending on the form taken by the instrument

time interval, with the equipment stabilised, between the time when an instantaneous variation

in the integral concentration is produced in the optical path and the time when the indication reaches a stated percentage (x) of its final value

The operation and storage temperature limits of this standard could exceed the required temperature

this case, the examination and testing of the protection technique(s) used for the requirements of the protection techniques used, then the temperature range of this standard shall be reduced to the range specified for the protection technique(s)

4.1.2 Electrical assemblies and components

Electrical assemblies and components shall comply with the appropriate construction and test requirements of 4.2 and of Clause 5 respectively

Fine adjustment of the optical beam direction shall be possible and an indication shall be provided to confirm that satisfactory alignment of the optical beam has been achieved Such equipment need not form a permanent part of the equipment

All equipment shall be constructed to facilitate, where applicable, regular functional, service, and calibration checks

4.2.2 Indicating devices

4.2.2.1 Indications and output signals

An indication or output signal shall be provided to show that the equipment is switched on

The indication or output signal shall be a measure of the actual integral concentration over the open path

NOTE The open path is independent of the number of times the optical radiation traverses it

If the equipment enters a special state (eg inhibition, beam blockage or a fault), a signal shall

be provided For fixed equipment, this shall include a contact or other transmittable output signal If these conditions are separately indicated, they shall be clearly identified

of the appropriate regulations for explosion protection

equipment shall be extended to cover the temperature range If this extension is not possible due to equipment In

Indicating or controlling devices, where provided, need not be an integral part of the equipment

When the equipment is intended for alarm only, the manufacturers shall provide or identify suitable points for connecting an indicating or recording device for testing the compliance of the equipment with this standard

4.2.2.2 Individual indicator lights

When individual indicator lights are incorporated in the equipment they shall be coloured as follows:

a) alarm indicators shall be coloured RED;

b) fault, inhibition and beam blockage indicators shall be coloured YELLOW;

c) power supply indicators and normal operation indicators shall be coloured GREEN

4.2.2.3 Indicator light marking

In addition to the colour requirements, the indicator lights shall be adequately labelled to show their functions

4.2.3 Alarm or output functions

When non-latching alarm devices, output contacts, or signal outputs are provided to indicate detection of an integral gas concentration in excess of a pre-set alarm level, the fact shall be indicated clearly and prominently in the instruction manual

The operation of any other output functions shall be clearly stated in the manual

4.2.4 Fault signals

Equipment shall provide a fault signal if any of the following conditions (as a minimum) occur: a) under range indication (below the zero point) between zero and -10 % full scale equivalent;

b) beam blockage;

c) low battery indication, if applicable;

d) a short-circuit or open-circuit in connections to any remote sensor, if applicable

Such signals shall be differentiated from any alarms

5 Test requirements

5.1 Introduction

The general requirements for test, conditions for test and test methods presented in 5.2, 5.3 and 5.4 respectively are intended as a basis for establishing whether the equipment conforms

to the particular performance requirements specified in subsequent parts of this standard

This standard is also applicable when an equipment manufacturer makes any claims regarding any special features of construction or superior performance that exceed the minimum requirements of this standard This may be increased accuracy or performance within the limits of the standard, or performance beyond the specifications of the standard All such claims, including environmental claims, shall be verified and the test procedures shall be extended or supplemented, where necessary, to verify the claimed performance

NOTE 1 Any additional tests should be agreed between the manufacturer and the test laboratory, and identified and described in the test report

NOTE 2 A manufacturer IP rating claim may not necessarily imply that the equipment will perform under the test conditions of the IP rating Any performance claims as to dust or particulate water would have to be separately verified by test

When claiming a superior performance outside these specifications, the measurement accuracy is not required to meet the standard’s minimum requirements when outside this specification (e.g for the normal temperature range of –25 °C to +55 °C the accuracy shall be

±10 % of the measuring range, but an extended temperature range of –40 °C to –25 °C may have a wider tolerance, such as ±15 % of the measuring range)

5.2 General requirements for tests

5.2.1 Samples and sequence of tests

For the purposes of type-testing, the tests shall be carried out on one sample equipment except that an additional sample equipment may be used for long term stability tests

The equipment shall be subjected to all of the tests applicable to that type of equipment, as described in 5.4 Tests are grouped in the following list but the sequence in which the tests are undertaken shall be agreed between the test authority and the manufacturer

e) Environmental tests

f) Optical beam tests

– Power supply interruptions and transients (5.4.15)

– Recovery from power supply interruptions (5.4.16)

– Electromagnetic compatibility (EMC) (5.4.17)