ISO 6145-7:2018/Amd 1
(Amendment)Gas analysis — Preparation of calibration gas mixtures using dynamic methods — Part 7: Thermal mass-flow controllers — Amendment 1: Correction of Formula C.4
General Information
- Abstract
- Status
- Not Published
- Technical Committee
- ISO/TC 158 - Analysis of gases
- Drafting Committee
- ISO/TC 158/WG 5 - Static and dynamic volumetric methods
- Current Stage
- 6000 - International Standard under publication
- Start Date
- 22-Aug-2026
- Completion Date
- 12-Sep-2026
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ISO 6145-7:2018/PRF Amd 1 - Gas analysis — Preparation of calibration gas mixtures using dynamic methods — Part 7: Thermal mass-flow controllers — Amendment 1: Correction of Formula C.4
REDLINE ISO 6145-7:2018/PRF Amd 1 - Gas analysis — Preparation of calibration gas mixtures using dynamic methods — Part 7: Thermal mass-flow controllers — Amendment 1: Correction of Formula C.4
Overview
ISO 6145-7:2018/Amd 1:2025 is an amendment to Part 7 of ISO 6145, focusing on gas analysis, specifically the preparation of calibration gas mixtures using dynamic methods with thermal mass-flow controllers. This amendment, published by the International Organization for Standardization (ISO), corrects and updates the calculation formulae presented in Annex C (Formula C.4) regarding uncertainties in the use of thermal mass-flow controllers for generating calibration gas mixtures.
Accurate calibration gas mixtures are essential for reliable analytical measurements in industrial, laboratory, and regulatory contexts. This amendment is critical for laboratories and facilities that depend on traceable and standardized gas mixture preparation, ensuring updated procedures and precise calculations in line with international best practices.
Key Topics
- Correction of Formula C.4: The main update in this amendment is the correction of Formula C.4, which is central to calculating the relative standard uncertainty in the preparation of calibration gas mixtures using thermal mass-flow controllers. Ensuring correct uncertainty calculations improves reliability and traceability.
- Clarification of Notations: The amendment clarifies mathematical symbols and parameters in subclause titles C.1 and C.2, as well as related equations, to prevent ambiguities for practitioners.
- Consistency for International Use: Aligns terminology and methodology with global standards, supporting uniform application in laboratories and industries.
Applications
The corrected standard is directly relevant to:
- Analytical Laboratories: Facilities performing quantitative gas analysis where the accuracy of calibration gas mixtures impacts test reliability and decision-making.
- Industrial Gas Production: Organizations mixing and distributing calibration gases for end-users in metrology, process control, or emission monitoring.
- Instrumentation Manufacturers: Developers and suppliers of thermal mass-flow controllers relying on correct algorithms and uncertainty calculations to ensure product compliance with ISO calibration standards.
- Quality Assurance: Institutions and regulatory bodies that mandate standardized processes for gas mixture calibration in environmental monitoring, industrial hygiene, health, and safety control.
- Research and Development: Academics and technical experts improving or validating new gas analysis methods requiring traceable gas mixture production.
By correcting a calculation formula, this amendment helps all stakeholders produce and use calibration gases that meet the highest international standards for precision and traceability.
Related Standards
- ISO 6145 Series: The umbrella standard for the preparation of calibration gas mixtures using dynamic methods, covering various techniques and apparatus.
- ISO/TC 158: Technical committee responsible for the analysis of gases and relevant standard development.
- CEN/TC 238: European standardization committee, involved through the Vienna Agreement to harmonize international and European standards on test gases.
- ISO/IEC Directives: Governing documents for drafting and maintaining all ISO standards, ensuring consistency across global industries.
Practical Value
Implementing ISO 6145-7:2018/Amd 1 ensures:
- Enhanced Accuracy: Updated calculation methods lead to improved uncertainty estimation, supporting high-precision gas analysis.
- Regulatory Compliance: Adherence to ISO protocols assists laboratories and businesses in maintaining compliance with international requirements.
- Global Consistency: Promotes uniform methods for calibration gas mixture preparation, crucial for multinational operations, trade, and cross-border quality assurance.
For more information or to access this amendment and related standards, consult the ISO website or your national standards body.
Relations
- Effective Date
- 12-Feb-2026
- Effective Date
- 10-May-2025
- Effective Date
- 26-Apr-2025
Buy Documents
ISO 6145-7:2018/PRF Amd 1 - Gas analysis — Preparation of calibration gas mixtures using dynamic methods — Part 7: Thermal mass-flow controllers — Amendment 1: Correction of Formula C.4
REDLINE ISO 6145-7:2018/PRF Amd 1 - Gas analysis — Preparation of calibration gas mixtures using dynamic methods — Part 7: Thermal mass-flow controllers — Amendment 1: Correction of Formula C.4
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Frequently Asked Questions
ISO 6145-7:2018/Amd 1 is a draft published by the International Organization for Standardization (ISO). Its full title is "Gas analysis — Preparation of calibration gas mixtures using dynamic methods — Part 7: Thermal mass-flow controllers — Amendment 1: Correction of Formula C.4". This standard covers: Gas analysis — Preparation of calibration gas mixtures using dynamic methods — Part 7: Thermal mass-flow controllers — Amendment 1: Correction of Formula C.4
Gas analysis — Preparation of calibration gas mixtures using dynamic methods — Part 7: Thermal mass-flow controllers — Amendment 1: Correction of Formula C.4
ISO 6145-7:2018/Amd 1 is classified under the following ICS (International Classification for Standards) categories: 71.040.40 - Chemical analysis. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 6145-7:2018/Amd 1 has the following relationships with other standards: It is inter standard links to EN ISO 6145-7:2018/prA1, ISO 3104:2023, ISO 6145-7:2018. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 6145-7:2018/Amd 1 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
International
Standard
ISO 6145-7
Third edition
Gas analysis — Preparation of
2018-12
calibration gas mixtures using
dynamic methods —
AMENDMENT 1
Part 7:
Thermal mass-flow controllers
AMENDMENT 1: Correction of
Formula C.4
Analyse des gaz — Préparation des mélanges de gaz pour
étalonnage à l'aide de méthodes dynamiques —
Partie 7: Régulateurs thermiques de débit massique
AMENDEMENT 1: Correction de la Formule C.4
PROOF/ÉPREUVE
Reference number
ISO 6145-7:2018/Amd.1:2026(en) © ISO 2026
ISO 6145-7:2018/Amd.1:2026(en)
© ISO 2026
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
ii
ISO 6145-7:2018/Amd.1:2026(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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/forewor
...
ISO 6145-7:2018/DAMPRF Amd 1:2025(en)
ISO/TC 158/ WG 5
Secretariat: SAC
Date: 2025-09-132026-07-24
Gas analysis — Preparation of calibration gas mixtures using
dynamic methods — —
Part 7:
Thermal mass-flow controllers
AMENDMENT 1: Correction of formulaFormula C.4
Analyse des gaz — Préparation des mélanges de gaz pour étalonnage à l'aide de méthodes dynamiques —
Partie 7: Régulateurs thermiques de débit massique
AMENDEMENT 1: Correction de la Formule C.4
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ISO 6145-7:2018/DAMPRF Amd 1:2025(en)
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
EmailE-mail: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland
iii
ISO #####-#:####(X 6145-7:2018/PRF Amd 1(en)
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 documentsdocument 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 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents.www.iso.org/patents. ISO shall not be held responsible for identifying any or all such
patent rights.
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.htmlwww.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 158, Analysis of gases., in collaboration with the
European Committee for Standardization (CEN) Technical Committee CEN/TC 238, Test gases, test pressures,
appliance categories and gas applianc
...