Bsi bs en 00626 2 1996 + a1 2008

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BRITISH STANDARD

Safety of machinery —
Reduction of risk to
health from hazardous
substances emitted by
machinery —
Part 2: Methodology leading to
verification procedures

ICS 13.110

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BS EN
626-2:1996
+A1:2008


Licensed copy: University of Auckland Library, University of Auckland Library, Version correct as of 08/05/2012 17:54, (c) The British Standards Institution 2012

BS EN 626-2:1996+A1:2008

National foreword
This British Standard is the UK implementation of EN 626-2:1996+A1:2008. It
supersedes BS EN 626-2:1996 which is withdrawn.
The start and finish of text introduced or altered by amendment is indicated in
the text by tags. Tags indicating changes to CEN text carry the number of the
CEN amendment. For example, text altered by CEN amendment A1 is

indicated by !".
The UK participation in its preparation was entrusted to Technical Committee
MCE/3, Safeguarding of machinery.
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.
Compliance with a British Standard cannot confer immunity from
legal obligations.

This British Standard was
published under the
authority of the
Standards Board and
comes into effect
on 15 December 1996

© BSI 2008

ISBN 978 0 580 60967 1

Amendments/corrigenda issued since publication
Date

Comments

30 November 2008

Implementation of CEN amendment A1:2008

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EUROPEAN STANDARD

EN 626-2:1996+A1

NORME EUROPÉENNE
EUROPÄISCHE NORM

June 2008

ICS 13.110

Supersedes EN 626-2:1996

English Version

Safety of machinery - Reduction of risk to health from hazardous
substances emitted by machinery - Part 2: Methodology leading
to verification procedures
Sécurité des machines - Réduction du risque pour la santé
résultant de substances dangereuses émises par les
machines - Partie 2: Méthodologie menant à des
procédures de vérification

Sicherheit von Maschinen - Reduzierung des
Gesundheitsrisikos durch Gefahrstoffe, die von Maschinen
ausgehen - Teil 2: Methodik beim Aufstellen von
Überprüfungsverfahren

This European Standard was approved by CEN on 20 June 1996 and includes Amendment 1 approved by CEN on 18 May 2008.
CEN 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 CEN Management Centre or to any CEN 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 CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: rue de Stassart, 36

© 2008 CEN

All rights of exploitation in any form and by any means reserved
worldwide for CEN national Members.

B-1050 Brussels

Ref. No. EN 626-2:1996+A1:2008: E


BS EN 626-2:1996+A1:2008

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EN 626-2:1996+A1:2008 (E)

Contents

Page

Foreword..............................................................................................................................................................3
Introduction .........................................................................................................................................................4
1

Scope ......................................................................................................................................................4

2

Normative references ............................................................................................................................4

3

Methodology...........................................................................................................................................5

4

Verification .............................................................................................................................................6

Annex A (normative) Flow diagram leading to verification procedures ......................................................7
Annex B (informative) Examples of types of emission and how to assess them.......................................8
Annex C (informative) Examples of relevant factors and their indicative parameters...............................9
Annex ZA (informative) !Relationship between this European Standard and the Essential

Requirements of EU Directive 98/37/EC"
" .......................................................................................10
Annex ZB (informative) !Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC"
" ...................................................................................11

2


BS EN 626-2:1996+A1:2008

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EN 626-2:1996+A1:2008 (E)

Foreword
This document (EN 626-2:1996+A1:2008) has been prepared by Technical Committee CEN/TC 114 “Safety of
machinery”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by December 2008, and conflicting national standards shall be withdrawn
at the latest by December 2008.
This document includes Amendment 1, approved by CEN on 2008-05-18.
This document supersedes EN 626-2:1996.
The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ".
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
!For relationship with EU Directive(s), see informative Annexes ZA and ZB, which are integral parts of this
document."
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech

Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and United Kingdom.

3


BS EN 626-2:1996+A1:2008

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EN 626-2:1996+A1:2008 (E)

Introduction
This European Standard is one of a group of standards produced by CEN/CENELEC under mandates from
CEC and EFTA. This group has been divided into several categories to avoid duplication and to develop a
logical structure which will enable rapid production of standards and easy cross reference between them.
The hierarchy of standards is as follows:
a)

Type A standards (generic safety standards) giving basic concepts, principles for design and general
aspects that can be applied to all machinery;

b)

Type B standards (group safety standards) dealing with one safety aspect or one type of safety related
device that can be used across a wide range of machinery:

c)



Type B1 standards on particular safety aspects (e.g. safety distances, surface temperature, noise);



Type B2 standards on safety related devices (e.g. two-hand controls, interlocking devices, pressure
sensitive devices, guards);

Type C standards (machine safety standards) giving detailed safety requirements for a particular
machine or group of machines.

This is a type B1 standard and its primary purpose is to give guidance to the writers of type C standards when
machines are identified as having emission of hazardous substances as a significant risk. This standard may
also be used as a guide in controlling the risk where there is no type C standard for a particular machine.
This standard may also be used to assist designers and manufacturers to identify sources of emission which
may subsequently affect the exposure of operators and others.
This standard also provides type C standard writers with guidance to enable the development of procedures
relating to verification. Such procedures are required to take account of the health risks associated with the
emission of hazardous substances at all stages in the life of a machine (see 3.11 of EN 292-1:1992 and
clause 4 of EN 626-1:1994).

1

Scope

This standard defines a procedure which leads to the selection of critical factors relating to emissions of
hazardous substances for the purpose of specifying suitable verification procedures.
This standard is to be used in conjunction with EN 626-1.

2

Normative references

This European Standard incorporates, by dated or undated reference, provisions from other publications.
These normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to
apply to this European Standard only when incorporated in it by amendment or revision. For undated
references the latest edition of the publication referred to applies.
EN 292-1:1992, Safety of machinery, basic concepts, general principles for design — Part 1: Basic
terminology, methodology.

4


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EN 626-2:1996+A1:2008 (E)

EN 626-1:1994, Safety of machinery, reduction of risk to health from hazardous substances emitted by
machinery — Part 1: Principles and specifications for machinery manufacturers.
prEN 1093-1, Safety of machinery, evaluation of the emission of airborne hazardous substances – Part 1:
Selection of test methods.

3

Methodology

This clause defines the steps that shall be taken to lead to a verification procedure.
NOTE

These steps are summarised in annex A.

3.1 Identification of hazardous substances
3.1.1 Identify substances which may be emitted during the intended use of the machine (see EN 292-1 and
clause 4 of EN 626-1:1994).
3.1.2 Determine which of these substances are hazardous to health and the nature of the hazard (see 3.2 of
EN 626-1:1994).
3.1.3 Where a number of substances have been identified, the verification procedure should be carried out
on key substances which represent worst case properties. Key substances may be selected based on toxicity,
corrosive properties, solvent properties, dustiness, etc.

3.2 Characterisation of emissions
For all significant emissions of substances identified by 3.1.3 establish:


The likely quantity or scale of emission under all foreseeable circumstances at all stages in the life of a
machine;

NOTE 1

Amounts may be characterised by one of a number of assessment techniques (see annex B)



The location and direction of the emission with respect to the machine and the likely position of persons;



When the emission is likely to occur;

NOTE 2

This should relate to the likely presence of persons and the operating cycle of the machinery.



The physical characteristics of the emission, e.g. phase, velocity, temperature, pressure;



Whether it is likely to create an airborne emission or surface contamination.

3.3 Identification of critical factors
3.3.1

Identify any relevant factor which causes an emission and on which the method of reduction is based.

NOTE
Relevant factors may be related to materials, energy or machine design or performance; examples are given
in annex C.

5


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EN 626-2:1996+A1:2008 (E)

3.3.2

Identify critical factors. These are the relevant factors on which the emission is most dependent.

3.4 Specification of indicative parameters
3.4.1 Establish indicative parameters, which may be qualitative, related directly to the critical factors
identified.
NOTE

Examples are given in annex C

3.4.2 Specify the value, range of values, condition or state of the indicative parameter required to reduce
emission.

4

Verification

4.1 Verification is carried out by collection of data relating to the indicative parameters.
4.2 Verification may include results from field testing, laboratory testing, measurements, examination or
calculations.
4.3 A number of general test methods, which can be used as part of verification, are described in prEN
1093-1 and the following parts which are under preparation. More detailed test conditions for a specific type or
group of machines may be given in type C standards.

6

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EN 626-2:1996+A1:2008 (E)

Annex A
(normative)
Flow diagram leading to verification procedures

Table A.1

Clause

Sequence of steps

Examples

3.1

Identify hazardous substances



identify stage in life of the machine;



identify the hazardous properties.



likely quantity or scale of emission;



location of persons and direction of emissions;



when the emission is likely to occur;



physical characteristics; phase (e.g.: gas),
temperature;



airborne or surface contamination.



Materials: dustiness, usage rates, production rates;



Energy used: type;



Machine design: ergonomics; distances;
automation;



Performance: efficacy.

3.2

3.3.1

Characterise emissions

Identify relevant factors

3.3.2

Select critical factors

3.4.1

Specify indicative parameters

3.4.2

Set parameter values, ranges,
conditions or states

4

Specify verification
procedures

Factors which most influence the emission of
hazardous substances; prioritize these to assist
selection of indicative parameters.


Quantitative: obtained by measurements or
calculations;



Qualitative: information obtained by e.g. visual
inspection; visualisation techniques, design details.

Requirements to give performance which reduces
emissions



Specify information which relates to the specified
indicative parameters;



Evidence from field/laboratory tests,
measurements, visual inspections or calculations,

technical construction file.

7


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Annex B
(informative)
Examples of types of emission and how to assess them

Table B.1

Type of emission

Examples of assessment techniques

Nil or insignificant



Visual inspection;



Smoke tests;



Tyndall beam lamp;



Pressure testing.



Component performance;



Local concentration assessment.



Calculation from mass balance;



Test data.

Localized

Total (possibly multi-point emissions)

8

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Annex C
(informative)
Examples of relevant factors and their indicative parameters

Table C.1
Category

Relevant factors

Indicative parameters

Materials

Feed rates,
discharge rates

Mass rate (kg h ; linear rate (mm min ); resultant airborne
-3
concentrations (mg m ).

Feed forms

Dusty or solid, viscous, non-viscous or volatile liquids.

Process timing

Feed times (min).

Thermal

Temperature control (range °C);

Energy

-1)

-1

-1

Rate of temperature rise or fall (°C min );
Product discharge temperature (°C);
Liquid or gas coolant temperature (°C);
-1

Coolant flow rate (l h ).
Electrical

Energy absorbed (kWh);
Drive motor current (A).

Mechanical

-1

Stirring rate (revolutions m );
-1

Conveyor speed (m min );
Mixing time (min).
Air motion

-1

Cooling or capture velocity (m s );
-1

3

-1

Exhaust gas velocity (m s ) or flow rate (m s ).
Design

Settings, geometry,
orientation

Lid open or closed;
Time delay until lid opens (s);
Local exhaust ventilation, position;
Exhaust duct diameter (mm);
Nearest operator position (m);

Height of material drop (m);
Direction of discharge.

Performance

Seal leaks

Seal integrity.

Air cleaner

Separation efficiency (%);
pressure loss across filter (Pa).

Local exhaust
ventilation

Capture efficiency (%).

Pollution control
system

Decontamination index.

Total emission

Emission rate (g min ), pollutant concentration parameter (mg m ).

-1

-3

9


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EN 626-2:1996+A1:2008 (E)

Annex ZA
(informative)
!Relationship between this European Standard and the Essential
Requirements of EU Directive 98/37/EC

This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association to provide a means of conforming to Essential Requirements of the
New Approach Directive Machinery 98/37/EC, amended by 98/79/EC.
Once this standard is cited in the Official Journal of the European Communities under that Directive and has
been implemented as a national standard in at least one Member State, compliance with the normative
clauses of this standard given in Table ZA.1 confers, within the limits of the scope of this standard, a
presumption of conformity with the corresponding Essential Requirements of that Directive and associated
EFTA regulations.
Table ZA.1 — Correspondence between this European Standard and Directive 98/37/EC
Clause(s)/sub-clause(s) of this EN Essential Requirements (ERs) of Qualifying remarks/Notes
Directive 98/37/EC, amended by
98/79/EC
All clauses

Annex I, 1.5.13

Emission of dust, gases etc.

WARNING — Other requirements and other EC Directives may be applicable to the product(s) falling within
the scope of this standard."

10


BS EN 626-2:1996+A1:2008

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EN 626-2:1996+A1:2008 (E)

Annex ZB
(informative)
!Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC

This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association to provide a means of conforming to Essential Requirements of the
New Approach Directive Machinery 2006/42/EC.
Once this standard is cited in the Official Journal of the European Communities under that Directive and has
been implemented as a national standard in at least one Member State, compliance with the normative
clauses of this standard given in Table ZB.1 confers, within the limits of the scope of this standard, a
presumption of conformity with the corresponding Essential Requirements of that Directive and associated
EFTA regulations.
Table ZB.1 — Correspondence between this European Standard and Directive 2006/42/EC

Clause(s)/sub-clause(s) of this EN Essential Requirements (ERs) of Qualifying remarks/Notes
Directive 2006/42/EC
All clauses

Annex I, 1.5.13

Emissions of hazardous
materials and substances

WARNING — Other requirements and other EC Directives may be applicable to the product(s) falling within
the scope of this standard."

11


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BS EN
626-2:1996
+A1:2008

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