ISO 29042-2:2009

INTERNATIONAL ISO
STANDARD 29042-2
First edition
2009-02-15
Safety of machinery — Evaluation of the
emission of airborne hazardous
substances —
Part 2:
Tracer gas method for the measurement
of the emission rate of a given pollutant
Sécurité des machines — Évaluation de l'émission de substances
dangereuses véhiculées par l'air —
Partie 2: Méthode par gaz traceur pour le mesurage du taux d'émission
d'un polluant donné
Reference number
©
ISO 2009
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ii © ISO 2009 – All rights reserved

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 29042-2 was prepared by Technical Committee ISO/TC 199, Safety of machinery.
ISO 29042 consists of the following parts, under the general title Safety of machinery — Evaluation of the
emission of airborne hazardous substances:
⎯ Part 1: Selection of test methods
⎯ Part 2: Tracer gas method for the measurement of the emission rate of a given pollutant
⎯ Part 3: Test bench method for the measurement of the emission rate of a given pollutant
⎯ Part 4: Tracer method for the measurement of the capture efficiency of an exhaust system
The following parts are under preparation:
⎯ Part 5: Test bench method for the measurement of the separation efficiency by mass of air cleaning
systems with unducted outlet
⎯ Part 6: Test bench method for the measurement of the separation efficiency by mass of air cleaning
systems with ducted outlet
⎯ Part 7: Test bench method for the measurement of the pollutant concentration parameter
A room method for the measurement of the pollutant concentration parameter and a decontamination index
are to form the subjects of future parts 8 and 9.
Introduction
The structure of safety standards in the field of machinery is as follows:
a) type-A standards (basic safety standards) giving basic concepts, principles for design, and general
aspects that can be applied to all machinery;
b) type-B standards (generic safety standards) dealing with one safety aspect or one type of safeguard that
can be used across a wide range of machinery:
⎯ type-B1 standards on particular safety aspects (e.g. safety distances, surface temperature, noise);
⎯ type-B2 standards on safeguards (e.g. two-hand controls, interlocking devices, pressure-sensitive
devices, guards);
c) type-C standards (machine safety standards) dealing with detailed safety requirements for a particular
machine or group of machines.
This part of ISO 29042 is a type-B standard as stated in ISO 12100-1.
The requirements of this document can be supplemented or modified by a type-C standard.
For machines which are covered by the scope of a type-C standard and which have been designed and built
according to the requirements of that standard, the requirements of that type-C standard take precedence.
ISO/TC 199 has a mandate in this area to produce type-A and type-B standards, which will allow verification of
conformity with the essential safety requirements.
ISO 29042-2 is based on EN 1093-2:2006, amended by Amendment 1:2008, published by the European
Committee for Standardization (CEN).
iv © ISO 2009 – All rights reserved

INTERNATIONAL STANDARD ISO 29042-2:2009(E)

Safety of machinery — Evaluation of the emission of airborne
hazardous substances —
Part 2:
Tracer gas method for the measurement of the emission rate of
a given pollutant
1 Scope
This part of ISO 29042 specifies a method using tracer gas techniques to enable measurement of the
emission rates of gaseous substances from a single machine whose operation can be controlled.
It is not applicable to machinery manufactured before the date of publication of this part of ISO 29042.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references the latest edition of the referenced
document (including any amendments) applies.
ISO 12100-1:2003, Safety of machinery — Basic concepts, general principles for design — Part 1: Basic
terminology, methodology
ISO 29042-1:2008, Safety of machinery — Evaluation of the emission of airborne hazardous substances —
Part 1: Selection of test methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12100-1 and ISO 29042-1 and the
following apply.
3.1
tracer gas technique
use of gaseous substances with an aerodynamic behaviour comparable with the gaseous hazardous
substance under consideration and for which concentrations can be reliably measured
4 Principle
The principle is based on the use of a tracer gas generated at a known and constant emission rate to provide
the best representation of the pollutant source. The mean tracer gas and pollutant concentrations are
measured in the vicinity of the source. Assuming that the aerodynamic behaviour of the pollutant is equal to
that of the tracer gas, the pollutant emission rate can be determined.
5 Location of the machine
5.1 General
The method is intended to be used for a machine located either in a test room or in the field.
5.2 Room method
The general airflow patterns in the test room should be characterized to enable more precise control of the
general and local ventilation to be achieved. The machine should be placed in the centre of the room.
5.3 Field method
Many machines cannot be tested in a test room because they are too large, too difficult to handle or have
special installation or process requirements. Tests may be performed on machines in the places where they
are installed, i.e. the workplace. For this purpose, it shall be ensured that pollutants from other emission
sources present in the room shall not affect the measurements of the concentrations of the specific pollutant
emitted from the machine under test.
6 Apparatus and materials
6.1 Tracer gas emitter, capable of providing a release of the tracer gas in the same manner as the
pollutant emission.
The shape of the emitter should resemble the shape of the real pollutant source. A distinction is generally
drawn between
⎯ point sources (e.g. welding operations, localized leaks from gaskets and flanges, localized spraying, such
as a painting jet),
⎯ plane sources (e.g. open vessel or tank containing liquid or melted solid liable to evaporate or sublimate,
such as galvanizing baths and electroplating baths), and
⎯ volumetric sources (e.g. closed machine with distributed leaks, rubber making machine, printing machine,
degreaser, dry-cleaning machine, diffuse spraying such as plant-care products in agriculture).
Point sources should be simulated by opened tubes producing jets of variable aerodynamic characteristics or
by sintered materials diffusing the tracer gas at a low initial velocity. Plane and volumetric sources should be
simulated by a network of point sources or perforated tubes that are suitably distributed.
6.2 Tracer gas flow rate measuring device, capable of measuring tracer gas flow rates in the appropriate
range.
NOTE The tracer gas flow rate depends on the sensitivity of the tracer gas analyser. For most applications, a device
−1 −1
calibrated to measure flo
...