Environmental testing - Part 2-60: Tests - Test Ke: Flowing mixed gas corrosion test

IEC 60068-2-60:2015 is available as IEC 60068-2-60:2015 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60068-2-60:2015 determines the corrosive influence of operating and storage indoor environments on electrotechnical products components, equipment and materials, particularly contacts and connections, considered separately, integrated into a subassembly or assembled as a complete equipment. This third edition cancels and replaces the second edition, published in 1995, and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- updated IEC format;
- updated normative references list;
- addition of information of the working volume;
- revision of the test procedure;
- revision of the figures in Annex B.

Essais d'environnement - Partie 2-60: Essais - Essai Ke: Essais de corrosion dans un flux de mélange de gaz

L'IEC 60068-2-60:2015 est disponible sous forme de IEC 60068-2-60:2015 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 60068-2-60:2015 établit l'influence corrosive de l'environnement sur des composants de produits électrotechniques, des équipements et des matériels, en fonctionnement ou stockés à l'intérieur de bâtiments, en particulier sur des contacts et des connexions, pris individuellement, intégrés dans un sous-ensemble ou faisant partie d'un équipement complet. Cette troisième édition annule et remplace la deuxième édition publiée en 1995. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- mise à jour du format de l'IEC;
- mise à jour de la liste de références normatives;
- ajout d'informations concernant le volume de travail;
- révision de la procédure d'essai;
- révision des figures dans l'Annexe B.

General Information

Status
Published
Publication Date
17-Jun-2015
Current Stage
PPUB - Publication issued
Start Date
18-Jun-2015
Completion Date
18-Jun-2015
Ref Project

Buy Standard

Standard
IEC 60068-2-60:2015 - Environmental testing - Part 2-60: Tests - Test Ke: Flowing mixed gas corrosion test
English and French language
37 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

IEC 60068-2-60
Edition 3.0 2015-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-60: Tests – Test Ke: Flowing mixed gas corrosion test
Essais d'environnement –
Partie 2-60: Essais – Essai Ke: Essai de corrosion dans un flux de mélange de
gaz
IEC 60068-2-60:2015-06(en-fr)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2015 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from

either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC

copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or

your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite

ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie

et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des

questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez

les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC

The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes

International Standards for all electrical, electronic and related technologies.
About IEC publications

The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the

latest edition, a corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org

The stand-alone application for consulting the entire The world's leading online dictionary of electronic and

bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and

Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 15

documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International

iPad. Electrotechnical Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary

The advanced search enables to find IEC publications by a More than 60 000 electrotechnical terminology entries in

variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions

committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries

and withdrawn publications. have been collected from earlier publications of IEC TC 37,

77, 86 and CISPR.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc

details all new publications released. Available online and If you wish to give us your feedback on this publication or

also once a month by email. need further assistance, please contact the Customer Service

Centre: csc@iec.ch.
A propos de l'IEC

La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des

Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC

Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la

plus récente, un corrigendum ou amendement peut avoir été publié.
Catalogue IEC - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
Application autonome pour consulter tous les renseignements
Le premier dictionnaire en ligne de termes électroniques et
bibliographiques sur les Normes internationales,
électriques. Il contient plus de 30 000 termes et définitions en
Spécifications techniques, Rapports techniques et autres
anglais et en français, ainsi que les termes équivalents dans
documents de l'IEC. Disponible pour PC, Mac OS, tablettes
15 langues additionnelles. Egalement appelé Vocabulaire
Android et iPad.
Electrotechnique International (IEV) en ligne.
Recherche de publications IEC - www.iec.ch/searchpub
Glossaire IEC - std.iec.ch/glossary
Plus de 60 000 entrées terminologiques électrotechniques, en
La recherche avancée permet de trouver des publications IEC

en utilisant différents critères (numéro de référence, texte, anglais et en français, extraites des articles Termes et

comité d’études,…). Elle donne aussi des informations sur les Définitions des publications IEC parues depuis 2002. Plus

projets et les publications remplacées ou retirées. certaines entrées antérieures extraites des publications des

CE 37, 77, 86 et CISPR de l'IEC.
IEC Just Published - webstore.iec.ch/justpublished
Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications IEC. Just

Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur cette

Disponible en ligne et aussi une fois par mois par email. publication ou si vous avez des questions contactez-nous:

csc@iec.ch.
---------------------- Page: 2 ----------------------
IEC 60068-2-60
Edition 3.0 2015-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-60: Tests – Test Ke: Flowing mixed gas corrosion test
Essais d'environnement –
Partie 2-60: Essais – Essai Ke: Essai de corrosion dans un flux de mélange de
gaz
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040 ISBN 978-2-8322-2747-3

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60068-2-60:2015 © IEC 2015
CONTENTS

FOREWORD ......................................................................................................................... 3

1 Scope ............................................................................................................................ 5

2 Normative references..................................................................................................... 5

3 Test apparatus .............................................................................................................. 5

4 Severities ...................................................................................................................... 6

5 Preconditioning .............................................................................................................. 6

6 Initial measurements ...................................................................................................... 6

7 Testing .......................................................................................................................... 7

7.1 General ................................................................................................................. 7

7.2 Test specimens ..................................................................................................... 7

7.3 Corrosivity monitoring materials ............................................................................. 7

7.4 Testing procedure ................................................................................................. 7

8 Recovery ....................................................................................................................... 9

9 Final measurements ...................................................................................................... 9

10 Information to be given in the relevant specification ........................................................ 9

11 Information to be given in the test report ...................................................................... 10

Annex A (normative) Corrosion monitoring copper coupons ................................................ 11

A.1 General ............................................................................................................... 11

A.2 Nature and dimension ......................................................................................... 11

A.3 Cleaning procedure ............................................................................................. 11

Annex B (informative) Description of test apparatus ............................................................ 12

B.1 General ............................................................................................................... 12

B.2 Climatic system ................................................................................................... 12

B.3 Test enclosure .................................................................................................... 13

B.4 Gas delivery system ............................................................................................ 14

B.5 Analysing system ................................................................................................ 14

B.5.1 Temperature and humidity ............................................................................ 14

B.5.2 Gases .......................................................................................................... 14

B.6 Other corrosion monitoring methods .................................................................... 15

B.6.1 Mass increase .............................................................................................. 15

B.6.2 Surface analysis of monitoring coupons ........................................................ 15

B.6.3 Visual examination ....................................................................................... 16

B.7 Calibration of the chamber .................................................................................. 16

Annex C (informative) Guide to the selection of methods and test duration .......................... 17

C.1 Introductory remarks ........................................................................................... 17

C.2 Function of corrosive gases used in the tests ....................................................... 17

C.3 Use of the different test methods ......................................................................... 17

Bibliography ....................................................................................................................... 19

Figure B.1 – Example of test apparatus ............................................................................... 12

Table 1 – Test conditions ...................................................................................................... 6

---------------------- Page: 4 ----------------------
IEC 60068-2-60:2015 © IEC 2015 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENVIRONMENTAL TESTING –
Part 2-60: Tests – Test Ke: Flowing mixed gas corrosion test
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60068-2-60 has been prepared by IEC technical committee 104:

Environmental conditions, classification and methods of test.

This third edition cancels and replaces the second edition, published in 1995, and constitutes

a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
– updated IEC format;
– updated normative references list;
– addition of information of the working volume;
– revision of the test procedure;
– revision of the figures in Annex B.
---------------------- Page: 5 ----------------------
– 4 – IEC 60068-2-60:2015 © IEC 2015
The text of this standard is based on the following documents:
FDIS Report on voting
104/655/FDIS 104/656/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 60068 series, published under the general title Environmental

testing, can be found on the IEC website.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
IEC 60068-2-60:2015 © IEC 2015 – 5 –
ENVIRONMENTAL TESTING –
Part 2-60: Tests – Test Ke: Flowing mixed gas corrosion test
1 Scope

This part of IEC 60068-2 determines the corrosive influence of operating and storage indoor

environments on electrotechnical products components, equipment and materials, particularly

contacts and connections, considered separately, integrated into a subassembly or

assembled as a complete equipment.

It provides test methods giving information, on a comparative basis, to aid the selection of

materials, choice of production processes and component design, with regard to corrosion

resistance. A guide to the selection of methods and test duration is provided in Annex C.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.

IEC 60512-2-1, Connectors for electronic equipment – Tests and measurements – Part 2-1:

Electrical continuity and contact resistance tests – Test 2a: Contact resistance – Millivolt level

resistance method

IEC 60512-3-1, Connectors for electronic equipment – Tests and measurements – Part 3-1:

Insulation tests – Test 3a: Insulation resistance
ISO 431, Copper refinery shapes
3 Test apparatus

The test apparatus consists of a climatic system, test enclosure, gas delivery system and

means for measuring gas concentration.

Details of design and construction are optional but shall be such that the conditions specified

for each method are fulfilled throughout the working volume and shall comply with the

following requirements:
– water droplets or aerosols shall not be injected into the test enclosure;

– air and water used shall be sufficiently clean in order not to affect performance of the test;

– the test atmosphere shall flow through the enclosure in such a manner as to ensure

uniform test conditions within the working volume;

– the sampling point for gas analysis shall be in the working volume of the test enclosure;

– the exhaust gases shall be treated in accordance with the relevant regulatory stipulations;

– the wet bulb pod shall be placed in the test chamber in such a manner not to exceed

0,1 % of the cross-section of the test chamber.
---------------------- Page: 7 ----------------------
– 6 – IEC 60068-2-60:2015 © IEC 2015

Because of the strong synergistic effect and the so called “memory effect” (i.e., it is difficult to

fully remove the chlorine compounds from the chamber, tubes, etc.), it is recommended that

enclosures and tubing used for tests that incorporate chlorine only be used for chlorine tests.

The working volume is the volume within which the individual corrosion (mass increase of

copper coupons expressed in mg/( dm × day) according to Annex A) at each location differs

by a maximum of 15 % from the average corrosion of all coupons within the working volume.

4 Severities
The test severity shall be given in the relevant specification. It is defined by
– the test method, chosen from Table 1,
– the test duration.
Preferred durations, in days, are 4, 7, 10, 14 and 21.

Four methods are defined. The different parameters for each method are summarized in the

following Table 1. A guidance for the use of each method is given in Clause C.3.
Table 1 – Test conditions
Parameters Method 1 Method 2 Method 3 Method 4
H S (10 vol/vol) 100 ± 20 10 ± 5 100 ± 20 10 ± 5
NO (10 vol/vol)
200 ± 50 200 ± 50 200 ± 20
Cl (10 vol/vol)
10 ± 5 20 ± 5 10 ± 5
SO (10 vol/vol)
500 ± 100 200 ± 20
Temperature (°C) 25 ± 1 30 ± 1 30 ± 1 25 ± 1
RH (%) 75 ± 3 70 ± 3 75 ± 3 75 ± 3
Rate of ventilations 3 to 10 3 to 10 3 to 10 3 to 10
per hour
Mass increase of 1,0 to 2,0 0,3 to 1,3 1,2 to 2,2 1,2 to 2,4
copper coupons
mg/(dm × day)
according to Annex A

NOTE Since the nature of the corrosive attack is different for test Methods 1 to 4, neither their numbering nor

the corresponding mass increase of copper coupons reflect their severity.

Different temperature and humidity values (e.g. 40 °C and 80 %RH) may be used based upon mutual

agreement between the interested parties. The mass increase may be different from the given values.

5 Preconditioning

The relevant specification may require preconditioning of specimens, for example cleaning or

mechanical operation.
6 Initial measurements

Initial measurements shall be carried out as required by the relevant specification.

Generally, these measurements are:
---------------------- Page: 8 ----------------------
IEC 60068-2-60:2015 © IEC 2015 – 7 –
– contact resistance measurements for electromechanical product components (see
IEC 60512-2-1);
– insulation resistance measurements (see IEC 60512-3-1).
7 Testing
7.1 General
Samples exposed in the tests shall be
– the specimens being evaluated,
– corrosion monitor materials.
7.2 Test specimens

The relevant product specification shall define the conditions of the specimens during the test,

for example mated or unmated for connectors; contacts open or closed for switches, operated

or electrically loaded.

The duration of the operation or loading of heat-dissipating specimens, shall be such that the

temperature and the relative humidity in the working volume remain within the specified

tolerances.

The conditions of the specimens and the test chamber shall be such that condensation on the

specimens shall not occur when they are introduced into the test chamber.

The total volume of the test specimens should not exceed 10 % of the volume of the working

area of the test chamber. If the total volume of the test specimens exceed 10 %, the amount

exceeding 10 % shall be included in the test report.

The total surface area of the test specimens should not exceed 10 % of the surface area of

the working area of the test chamber. If the total surface of the test specimens exceed 10 %,

the amount exceeding 10 % shall be included in the test report.

A minimum space between specimens might be 10 mm so as not to disturb the uniform air

flow.
7.3 Corrosivity monitoring materials

Copper coupons shall be exposed with the test specimens in order to verify the conformance

of the test condition.

A minimum of five test coupons of copper, prepared in accordance with Annex A, shall be

exposed with the test specimens for the same duration. Their mass increase during the test,

measured by a balance with a resolution of 0,01 mg, shall be taken as a measure of the

corrosion and as a monitor of the reproducibility and repeatability of the test.

Other vehicles, for example, gold-plated coupons or other specimens (see B.6.3) can be used

in addition to the copper coupons.
7.4 Testing procedure
One of the following test procedures shall be used:
---------------------- Page: 9 ----------------------
– 8 – IEC 60068-2-60:2015 © IEC 2015
Test procedure 1

When the test atmosphere does not contain chlorine (Method 1) or when the method for

measuring chlorine concentration does not suffer interference from the other gases present in

the test atmosphere, the following procedure shall be used:

– after the specified temperature is stabilized, start the flow of humid air, allow to stabilize

and adjust temperature and humidity not to accumulate the condensation on the inner wall

of the test chamber and the test specimen;
– start the flow of the gases into the humid air stream and allow to stabilize;

– measure and adjust gas concentrations. Allow to stabilize. When it is necessary to

measure chlorine concentration, total chlorine (not only chlorine gas, Cl ) present in the

test atmosphere is taken as a measure of chlorine gas concentration. The chlorine added

to the test atmosphere shall still only be in the form of chlorine gas, Cl ;

– introduce the test specimens and the corrosion monitoring materials as prescribed in 7.3.

The copper coupons shall be exposed with the test specimens for the first 4 days during a

test duration. The copper coupons might be exposed another 4 days during a test

duration, if necessary. It shall be included in the test report. The test specimens and the

corrosion monitoring materials shall be distributed uniformly in the working volume. They

shall not come in contact with one another nor shield one another from the test

atmosphere. The test specimens shall be in the condition (for example, mated/unmated,

electrically loaded or operated) as stated in the relevant specification. The test duration

shall be measured from this point;

– allow the test conditions to stabilize, which may require considerable time. Measure and

adjust, if necessary, temperature, humidity and gas concentrations. During these

adjustments, any overshooting of gas concentration shall be avoided. Maximum allowed

duration of this period of stabilization and adjustments, to prescribed values, is 24 h;

– during the course of testing, temperature, humidity and gas concentrations shall be kept

within the prescribed limits. The chamber is allowed to be opened during the test.

The number of openings shall be limited.
No opening is allowed for a test duration shorter than 4 days.
One opening is allowed for a test duration of between 4 and 10 days.
One opening per week is allowed for a test duration exceeding 10 days.

The duration of these openings shall be limited to the time necessary to remove and

introduce specimens and/or copper coupons;

– at the end of the test period, remove the specimens and the corrosion monitoring

materials.
Test procedure 2

When chlorine is present in the test atmosphere (Methods 2 to 4) and when the method for

measuring chlorine suffers interference from other gases in the test atmosphere, the following

procedure shall be used:

– after the specified temperature is stabilized, start the flow of humid air, allow to stabilize

and adjust temperature and humidity so as not to accumulate the condensation on the

inner wall of the test chamber and the test specimen;
– start the flow of chlorine into the humid air stream and allow to stabilize;
– measure and adjust the chlorine concentration. Allow to stabilize;

– introduce the test specimens and the corrosion monitor materials as prescribed in 7.2. The

copper coupons shall be exposed with the test specimens for the first 4 days during a test

duration. The copper coupons might be exposed another 4 days during a test duration, if

necessary. It shall be included in the test report. The test specimens and the corrosion

monitoring materials shall be distributed uniformly in the working volume. They shall not

come in contact with one another nor shield one another from the test atmosphere. The

---------------------- Page: 10 ----------------------
IEC 60068-2-60:2015 © IEC 2015 – 9 –

test specimens shall be in the condition (for example, mated/unmated, electrically loaded

or operated) as stated in the relevant specification;

– allow temperature, humidity and chlorine concentration to stabilize, which may require

considerable time due to initially high reaction or adsorption rates of chlorine with surfaces.

If necessary, measure and adjust the chlorine concentration. During this adjustment, any

overshooting of gas concentration shall be avoided. The chlorine concentration shall

remain stable for 2 h minimum. The maximum allowed duration of this period of chlorine

stabilization and adjustments, to prescribed values, is 24 h;

– start the flow of the remaining gases and allow to stabilize. Measure and adjust, if

necessary, temperature, humidity and gas concentrations, excluding chlorine. During

these adjustments, any overshooting of gas concentration shall be avoided. The maximum

allowed duration of this period of stabilization and adjustments, to prescribed values, is

24 h. The test duration is measured from the moment when all gases are present in the

test atmosphere;

– during the course of testing, temperature, humidity and gas concentrations shall be kept

within the prescribed limits. Chlorine concentration, however, cannot be controlled during

the test. The way to ensure that values remain within the set limits is to carry out the

chlorine measurement after finishing the test (see below). The chamber is allowed to be

opened during the test.
The number of openings shall be limited.
No opening is allowed for a test duration shorter than 4 days.
One opening is allowed for a test duration of between 4 and 10 days.
One opening per week is allowed for a test duration exceeding 10 days.

The duration of these openings shall be limited to the time necessary to remove and

introduce specimens and/or copper coupons;

– at the end of the test period, stop the flow of gases except chlorine which shall remain

running. Allow sufficient time to empty the chamber of the other gases, to an extent

sufficient to avoid interference with chlorine analyses;

– measure the chlorine concentration which shall be within the limits prescribed in order for

the test to be valid;
– remove the te
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.