ISO 7935:2024
(Main)Stationary source emissions — Determination of the mass concentration of sulfur dioxide in flue gases — Performance characteristics of automated measuring systems
Stationary source emissions — Determination of the mass concentration of sulfur dioxide in flue gases — Performance characteristics of automated measuring systems
This document specifies a method for the determination of sulfur dioxide (SO2) in flue gases of stationary sources and describes the fundamental structure and the key performance characteristics of automated measuring systems. The method allows continuous monitoring with permanently installed measuring systems of SO2 emissions. This document describes extractive systems and in situ (non-extractive) systems in connection with a range of analysers that operate using, for example, the following principles: — non-dispersive infrared absorption (NDIR); — Fourier transform infrared (FTIR) spectroscopy; — laser spectroscopic technique or tunable laser spectroscopy (TLS); — non-dispersive ultraviolet absorption (NDUV); — differential optical absorption spectroscopy (DOAS). Other equivalent instrumental methods can be used provided they meet the minimum performance requirements specified in this document. The measuring system can be validated with reference materials, according to this document, or comparable methods. Automated measuring system (AMS) based on the principles listed above has been used successfully in this application for the measuring ranges as shown in Annex E.
Émissions de sources fixes — Détermination de la concentration en masse de dioxyde de soufre — Caractéristiques de performance des systèmes de mesurage automatiques
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International
Standard
ISO 7935
Second edition
Stationary source emissions —
2024-02
Determination of the mass
concentration of sulfur dioxide
in flue gases — Performance
characteristics of automated
measuring systems
Émissions de sources fixes — Détermination de la concentration
en masse de dioxyde de soufre — Caractéristiques de
performance des systèmes de mesurage automatiques
Reference number
ISO 7935:2024(en) © ISO 2024
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ISO 7935:2024(en)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2024
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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2024 – All rights reserved
ii
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ISO 7935:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms. 4
4.1 Symbols .4
4.2 Abbreviated terms .5
5 Principle . 5
6 Description of the automated measuring systems . 5
6.1 Sampling and sample gas conditioning systems .5
6.2 Analyser equipment .6
7 Performance characteristics and criteria . 6
7.1 Performance criteria .6
7.2 Determination of the performance characteristics .7
7.2.1 Performance test .7
7.2.2 Ongoing quality control .7
8 Selection and installation procedure .
...
International
Standard
ISO 7935
Second edition
Stationary source emissions
- Determination of the mass
concentration of sulfur dioxide
in flue gases - Performance
characteristics of automated
measuring systems
Émissions de sources fixes — Détermination de la concentration
en masse de dioxyde de soufre — Caractéristiques de
performance des systèmes de mesurage automatiques
PROOF/ÉPREUVE
Reference number
ISO 7935:2023(en) © ISO 2023
---------------------- Page: 1 ----------------------
ISO 7935:2023(en)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
PROOF/ÉPREUVE
© ISO 2023 – All rights reserved
ii
---------------------- Page: 2 ----------------------
ISO 7935:2023(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms. 4
4.1 Symbols .4
4.2 Abbreviated terms .5
5 Principle . 5
6 Description of the automated measuring systems . 5
6.1 Sampling and sample gas conditioning systems .5
6.2 Analyser equipment .6
7 Performance characteristics and criteria . 6
7.1 Performance criteria .6
7.2 Determination of the performance characteristics .7
7.2.1 Performance test .7
7.2.2 Ongoing quality control .7
8 Selection and installation procedure .
...
ISO/DIS PRF 7935:2023(E)
ISO /TC 146/SC 1/WG 34
Secretariat: BIS
Date: 2023-12-22
Stationary Sourcesource emissions —- Determination of the mass
concentration of sulfur dioxide in flue gases —- Performance
characteristics of automated measuring systems
Second edition
Date: 2023-06-16
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Émissions de sources fixes — Détermination de la concentration en masse de dioxyde de soufre —
Caractéristiques de performance des systèmes de mesurage automatiques
PROOF
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ISO/DIS PRF 7935:20222023(E)
© ISO 2023
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'sISO’s member body in the country of the requester.
ISO Copyright Office copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email: copyright@iso.org
E-mail: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland.
© ISO 2022 – All rights reserved iii
© ISO 2023 – All rights reserved
iii
---------------------- Page: 3 ----------------------
ISO/DIS PRF 7935:20222023(E)
Contents
Foreword . vii
Introduction . ix
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 5
4.1 Symbols . 5
4.2 Abbreviated terms . 5
5 Principle . 6
6 Description of the automated measuring systems . 6
6.1 Sampling and sample gas conditioning systems . 6
6.2 Analyser equipment . 6
7 Performance characteristics and criteria. 6
7.1 Performance criteria . 6
7.2 Determination of the performance characteristics. 7
7.2.1 Performance test . 7
7.2.2 Ongoing quality control . 8
8 Selection and installation procedure . 8
8.1 Choice of the measuring system . 8
8.2 Sampling .
...
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