SIST EN ISO 11844-3:2020
(Main)Corrosion of metals and alloys - Classification of low corrosivity of indoor atmospheres - Part 3: Measurement of environmental parameters affecting indoor corrosivity (ISO 11844-3:2020)
Corrosion of metals and alloys - Classification of low corrosivity of indoor atmospheres - Part 3: Measurement of environmental parameters affecting indoor corrosivity (ISO 11844-3:2020)
This document specifies methods for measuring the environmental parameters used to classify the corrosivity of indoor atmospheres on metals and alloys.
Korrosion von Metallen und Legierungen - Einteilung der Korrosivität in Räumen mit geringer Korrosivität - Teil 3: Messung der Umgebungsparameter, die Korrosivität in Räumen beeinflussen (ISO 11844-3:2020)
Dieses Dokument legt Verfahren zum Messen der Umgebungsparameter fest, die dazu verwendet werden, die Korrosivität der Atmosphäre in Innenräumen von Metallen und Legierungen zu klassifizieren.
Corrosion des métaux et alliages - Classification de la corrosivité faible des atmosphères d'intérieur - Partie 3: Mesurage des paramètres environnementaux affectant la corrosivité des atmosphères d'intérieur (ISO 11844-3:2020)
Le présent document spécifie des méthodes de mesure des paramètres environnementaux utilisés pour la classification de la corrosivité des atmosphères d'intérieur pour les métaux et alliages.
Korozija kovin in zlitin - Klasifikacija notranjih atmosfer z nizko korozivnostjo - 3. del: Merjenje okoljskih parametrov, ki vplivajo na korozivnost v zaprtih prostorih (ISO 11844-3:2020)
Ta dokument določa metode za merjenje okoljskih parametrov, ki se uporabljajo za klasifikacijo notranjih atmosfer, ki vplivajo na korozivnost kovin in zlitin v zaprtih prostorih.
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 11844-3:2020
01-marec-2020
Nadomešča:
SIST EN ISO 11844-3:2008
Korozija kovin in zlitin - Klasifikacija notranjih atmosfer z nizko korozivnostjo - 3.
del: Merjenje okoljskih parametrov, ki vplivajo na korozivnost v zaprtih prostorih
(ISO 11844-3:2020)
Corrosion of metals and alloys - Classification of low corrosivity of indoor atmospheres -
Part 3: Measurement of environmental parameters affecting indoor corrosivity (ISO
11844-3:2020)
Korrosion von Metallen und Legierungen - Einteilung der Korrosivität in Räumen mit
geringer Korrosivität - Teil 3: Messung der Umgebungsparameter, die Korrosivität in
Räumen beeinflussen (ISO 11844-3:2020)
Corrosion des métaux et alliages - Classification de la corrosivité faible des atmosphères
d'intérieur - Partie 3: Mesurage des paramètres environnementaux affectant la
corrosivité des atmosphères d'intérieur (ISO 11844-3:2020)
Ta slovenski standard je istoveten z: EN ISO 11844-3:2020
ICS:
77.060 Korozija kovin Corrosion of metals
SIST EN ISO 11844-3:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 11844-3:2020
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SIST EN ISO 11844-3:2020
EN ISO 11844-3
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2020
EUROPÄISCHE NORM
ICS 77.060 Supersedes EN ISO 11844-3:2008
English Version
Corrosion of metals and alloys - Classification of low
corrosivity of indoor atmospheres - Part 3: Measurement
of environmental parameters affecting indoor corrosivity
(ISO 11844-3:2020)
Corrosion des métaux et alliages - Classification de la Korrosion von Metallen und Legierungen - Einteilung
corrosivité faible des atmosphères d'intérieur - Partie der Korrosivität in Räumen mit geringer Korrosivität -
3: Mesurage des paramètres environnementaux Teil 3: Messung der Umgebungsparameter, die
affectant la corrosivité des atmosphères d'intérieur Korrosivität in Räumen beeinflussen (ISO 11844-
(ISO 11844-3:2020) 3:2020)
This European Standard was approved by CEN on 21 December 2019.
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-CENELEC 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-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11844-3:2020 E
worldwide for CEN national Members.
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SIST EN ISO 11844-3:2020
EN ISO 11844-3:2020 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 11844-3:2020
EN ISO 11844-3:2020 (E)
European foreword
This document (EN ISO 11844-3:2020) has been prepared by Technical Committee ISO/TC 156
"Corrosion of metals and alloys" in collaboration with Technical Committee CEN/TC 262 “Metallic and
other inorganic coatings, including for corrosion protection and corrosion testing of metals and alloys”
the secretariat of which is held by BSI.
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 July 2020, and conflicting national standards shall be
withdrawn at the latest by July 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 11844-3:2008.
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,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 11844-3:2020 has been approved by CEN as EN ISO 11844-3:2020 without any
modification.
3
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SIST EN ISO 11844-3:2020
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SIST EN ISO 11844-3:2020
INTERNATIONAL ISO
STANDARD 11844-3
Second edition
2020-01
Corrosion of metals and alloys —
Classification of low corrosivity of
indoor atmospheres —
Part 3:
Measurement of environmental
parameters affecting indoor
corrosivity
Corrosion des métaux et alliages — Classification de la corrosivité
faible des atmosphères d'intérieur —
Partie 3: Mesurage des paramètres environnementaux affectant la
corrosivité des atmosphères d'intérieur
Reference number
ISO 11844-3:2020(E)
©
ISO 2020
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SIST EN ISO 11844-3:2020
ISO 11844-3:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 11844-3:2020
ISO 11844-3:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Environmental parameters . 1
6 Humidity and temperature parameters. 2
6.1 Relative humidity . 2
6.2 Temperature . 2
6.3 Temperature–humidity complex . 2
7 Airborne gas contaminants . 2
7.1 Principle . 2
7.2 Placing of measuring equipment . 3
7.2.1 General. 3
7.2.2 Continuous gas-measuring instruments . 3
7.2.3 Active sampler. 3
7.2.4 Passive sampler. 3
7.2.5 Gas-deposition equipment . 3
7.3 Measuring methods and duration . 3
7.3.1 Continuous measurement . 3
7.3.2 Measurement and calculation with the active sampler . 3
7.3.3 Measurement and calculation with the passive sampler . 4
7.3.4 Measurement and calculation of deposition rate of gas pollution . 5
8 Airborne particle contaminants . 6
8.1 Principle . 6
8.2 Volumetric measurements . 6
8.3 Measurement of particle deposits . 6
9 Dry deposition velocity and measurements of air flow . 7
Annex A (informative) Reagents used for both passive and active samplers .8
Bibliography .10
© ISO 2020 – All rights reserved iii
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SIST EN ISO 11844-3:2020
ISO 11844-3:2020(E)
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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys.
This second edition cancels and replaces the first edition (ISO 11844-3:2006), which has been
technically revised. The main changes compared with the previous edition are as follows:
— the normative references have been updated;
— a reference to ISO 16000 in Clause 5 has been added;
— the detection limits in 7.3.1 and 7.3.2 have been updated;
— a new Clause 9 has been added.
A list of all parts in the ISO 11844 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
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SIST EN ISO 11844-3:2020
ISO 11844-3:2020(E)
Introduction
This document deals with environmental parameters for the characterization of indoor atmospheres
and methods of measurement.
The environmental parameters for the characterization of indoor atmospheres include more airborne
contaminants than are normally used for the characterization of the outdoor environment.
Measurement of environmental parameters is a way of characterizing the corrosivity of the indoor
atmosphere and will always be required if it is necessary to consider measures for reducing the
corrosivity.
© ISO 2020 – All rights reserved v
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SIST EN ISO 11844-3:2020
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SIST EN ISO 11844-3:2020
INTERNATIONAL STANDARD ISO 11844-3:2020(E)
Corrosion of metals and alloys — Classification of low
corrosivity of indoor atmospheres —
Part 3:
Measurement of environmental parameters affecting
indoor corrosivity
1 Scope
This document specifies methods for measuring the environmental parameters used to classify the
corrosivity of indoor atmospheres on metals and alloys.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 7708, Air quality — Particle size fraction definitions for health-related sampling
EN 12341, Ambient air — Standard gravimetric measurement method for the determination of the PM or
10
PM mass concentration of suspended particulate matter
2,5
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Principle
Different combinations of parameters affect the corrosivity of indoor atmospheres. Knowledge about
possible sources of environmental effects shall be obtained before decisions regarding the type
of measurements needed are taken. The characterization of indoor atmospheric corrosivity using
environmental parameters is more complicated than measuring the corrosivity with metal specimens.
However, in many cases, the measurement of environmental parameters can give a good indication of
how to establish the corrosivity of an environment and will, in combination with the information given
in ISO 11844-1, give a good indication of the corrosivity categories for the materials in the select
...
SLOVENSKI STANDARD
oSIST prEN ISO 11844-3:2019
01-januar-2019
Korozija kovin in zlitin - Klasifikacija notranjih atmosfer z nizko korozivnostjo - 3.
del: Merjenje okoljskih parametrov, ki vplivajo na korozivnost v zaprtih prostorih
(ISO/DIS 11844-3:2018)
Corrosion of metals and alloys - Classification of low corrosivity of indoor atmospheres -
Part 3: Measurement of environmental parameters affecting indoor corrosivity (ISO/DIS
11844-3:2018)
Korrosion von Metallen und Legierungen - Einteilung der Korrosivität in Räumen mit
geringer Korrosivität - Teil 3: Messung der Umgebungsparameter, die Korrosivität in
Räumen beeinflussen (ISO/DIS 11844-3:2018)
Corrosion des métaux et alliages - Classification de la corrosivité faible des atmosphères
d'intérieur - Partie 3: Mesurage des paramètres environnementaux affectant la
corrosivité des atmosphères d'intérieur (ISO/DIS 11844-3:2018)
Ta slovenski standard je istoveten z: prEN ISO 11844-3
ICS:
77.060 Korozija kovin Corrosion of metals
oSIST prEN ISO 11844-3:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 11844-3:2019
---------------------- Page: 2 ----------------------
oSIST prEN ISO 11844-3:2019
DRAFT INTERNATIONAL STANDARD
ISO/DIS 11844-3
ISO/TC 156 Secretariat: SAC
Voting begins on: Voting terminates on:
2018-11-12 2019-02-04
Corrosion of metals and alloys — Classification of low
corrosivity of indoor atmospheres —
Part 3:
Measurement of environmental parameters affecting
indoor corrosivity
Corrosion des métaux et alliages — Classification de la corrosivité faible des atmosphères d'intérieur —
Partie 3: Mesurage des paramètres environnementaux affectant la corrosivité des atmosphères d'intérieur
ICS: 77.060
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 11844-3:2018(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2018
---------------------- Page: 3 ----------------------
oSIST prEN ISO 11844-3:2019
ISO/DIS 11844-3:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 11844-3:2019
ISO/DIS 11844-3:2018(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Environmental parameters . 2
6 Humidity and temperature parameters. 2
6.1 Relative humidity . 2
6.2 Temperature . 2
6.3 Temperature–humidity complex . 3
7 Airborne gas contaminants . 3
7.1 Principle . 3
7.2 Placing of measuring equipment . 3
7.2.1 General. 3
7.2.2 Continuous gas-measuring instruments . 3
7.2.3 Active sampler. 3
7.2.4 Passive sampler. 3
7.2.5 Gas‑deposition equipment . 3
7.3 Measuring methods and duration . 4
7.3.1 Continuous measurement . 4
7.3.2 Measurement and calculation with the active sampler . 4
7.3.3 Measurement and calculation with the passive sampler . 4
7.3.4 Measurement and calculation of deposition rate of gas pollution . 6
8 Airborne particle contaminants . 6
8.1 Principle . 6
8.2 Volumetric measurements . 6
8.3 Measurement of particle deposits . 7
9 Dry deposition velocity and measurements of air flow . 7
Annex A (informative) Reagents used for both passive and active samplers .8
Bibliography .10
© ISO 2018 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 11844-3:2019
ISO/DIS 11844-3:2018(E)
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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys.
This second edition cancels and replaces the first edition (ISO 11844‑3:2006), which has been
technically revised.
The main changes compared to the previous edition are as follows:
— the normative references have been updated;
— reference to ISO 16000 in the Clause 5 has been added;
— detection limits in 7.3.1 and 7.3.2 have been updated;
— new Clause 8 has been added.
A list of all parts in the ISO 11844 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 11844-3:2019
ISO/DIS 11844-3:2018(E)
Introduction
This document deals with environmental parameters for the characterisation of indoor atmospheres
and methods of measurement.
The environmental parameters for the characterisation of indoor atmospheres include more airborne
contaminants than are normally used for the characterisation of the outdoor environment.
Measurement of environmental parameters is a way of characterising the corrosivity of the indoor
atmosphere and will always be required if it is necessary to consider measures for reducing the
corrosivity.
© ISO 2018 – All rights reserved v
---------------------- Page: 7 ----------------------
oSIST prEN ISO 11844-3:2019
---------------------- Page: 8 ----------------------
oSIST prEN ISO 11844-3:2019
DRAFT INTERNATIONAL STANDARD ISO/DIS 11844-3:2018(E)
Corrosion of metals and alloys — Classification of low
corrosivity of indoor atmospheres —
Part 3:
Measurement of environmental parameters affecting
indoor corrosivity
1 Scope
This document describes methods for measuring the environmental parameters used to classify the
corrosivity of indoor atmospheres on metals and alloys.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 7708, Air quality — Particle size fraction definitions for health-related sampling
ISO 9225, Corrosion of metals and alloys — Corrosivity of atmospheres — Measurement of environmental
parameters affecting corrosivity of atmospheres
ISO 11844-1, Corrosion of metals and alloys — Classification of low corrosivity of indoor atmospheres —
Part 1: Determination and estimation of indoor corrosivity
EN 12341, Air quality — Determination of the PM10 fraction of suspended particulate matter — Reference
method and field test procedure to demonstrate reference equivalence of measurement methods
ISO 16000-1, Indoor air — Part 1: General aspects of sampling strategy
ISO 16000-5, Indoor air — Part 5: Sampling strategy for volatile organic compounds (VOCs)
ISO 16000-15, Indoor air — Part 15: Sampling strategy for nitrogen dioxide (NO2)
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http: //www .electropedia .org/
— ISO Online browsing platform: available at https: //www .iso .org/obp
4 Principle
Different combinations of parameters affect the corrosivity of indoor atmospheres. Knowledge about
possible sources of environmental effects must be obtained before decisions regarding the type
of measurements needed are taken. The characterisation of indoor atmospheric corrosivity using
environmental parameters is more complicated than measuring the corrosivity with metal specimens.
However, in many cases, measurement of environmental parameters can give a good indication of how
© ISO 2018 – All rights reserved 1
---------------------- Page: 9 ----------------------
oSIST prEN ISO 11844-3:2019
ISO/DIS 11844-3:2018(E)
to establish the corrosivity of an environment and will, in combination with the information given
in ISO 11844‑1, give a good indication of the corrosivity categories for the materials in the selected
environment.
5 Environmental parameters
In indoor atmospheres, corrosion processes are characterised by a more complex group of parameters
than in outdoor atmospheres. In general, two groups of parameters should be measured:
— humidity and temperature;
— airborne contaminants, such as gases and particles, which in turn are affected by;
— dry deposition velocity and air flow.
Fluctuation in the temperature and humidity, particularly at higher humidity levels, may cause
condensation on cooler surfaces. The frequency and time of condensation is an important factor for
indoor corrosion.
The corrosion effects from these groups of parameters are usually interdependent. A particular level of
humidity is needed before corrosion begins, and this can vary for different contaminants. Combinations
of contaminants might accelerate the corrosion processes.
Methods for sampling and analysis of various air pollutants in indoor atmospheres are described in the
ISO 16000 series. Of specific relevance is ISO 16000‑1, which describes a general measurement strategy
for measuring indoor air pollution and specific standards for mea
...
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