SIST EN ISO 6142-1:2015/oprA1:2026

SIST EN ISO 6142-1:2015/oprA1:2026 is the European amendment to the ISO standard for gas analysis and preparation of calibration gas mixtures. It corrects formulae in Annex E and Annex G of the gravimetric method part for Class I mixtures, so it is mainly for laboratories and other users who prepare or check calibration gas mixtures by weighing components.

What does SIST EN ISO 6142-1:2015/oprA1:2026 specify?

SIST EN ISO 6142-1:2015/oprA1:2026 specifies corrections to the calculation formulae used in Annex E and Annex G of ISO 6142-1:2015. In practice, it is a change document that users apply together with the 2015 edition when carrying out the gravimetric method for Class I mixtures.

The amendment is narrowly focused:

• Annex E contains corrected formulae labelled E.3 and E.4.
• Annex G contains corrected formulae labelled G.1 to G.7.

What are the key requirements of SIST EN ISO 6142-1:2015/oprA1:2026?

SIST EN ISO 6142-1:2015/oprA1:2026 does not introduce a new preparation method; it replaces specific equations in the base standard. The key practical requirement is to use the corrected formulae wherever Annex E or Annex G calculations are applied.

Use the corrected Annex E formulae

SIST EN ISO 6142-1:2015/oprA1:2026 replaces Formula (E.3) and Formula (E.4). That matters for any calculation path that relies on Annex E, because the amendment changes the mathematical expressions that feed the result.

In practice, a lab or software developer should make sure the revised Annex E equations are the ones being used in worksheets, calculation tools, or validation checks.

Use the corrected Annex G formulae

SIST EN ISO 6142-1:2015/oprA1:2026 replaces Formulae (G.1) through (G.7). Annex G is the part that contains several linked formulae, so the amendment affects the full calculation chain rather than a single isolated expression.

In practical terms, anyone who applies Annex G needs to recheck their calculations against the corrected equations, especially if they use automated spreadsheets or software.

Apply the amendment with the base standard

SIST EN ISO 6142-1:2015/oprA1:2026 is an amendment to ISO 6142-1:2015. That means the corrected formulae are not a standalone method; they are used together with the base part on gravimetric preparation of Class I calibration gas mixtures.

For users, this means the amendment has to be read into existing procedures rather than treated as a separate standard.

Update calculation tools and documentation

SIST EN ISO 6142-1:2015/oprA1:2026 affects formulae, so any internal procedure, template, or software that reproduces Annex E or Annex G should be checked against the amended equations.

That matters in day-to-day work because the risk is not in sample preparation itself, but in using outdated calculation logic.

What terms does SIST EN ISO 6142-1:2015/oprA1:2026 define?

• Calibration gas mixtures - Gas mixtures prepared for use as calibration standards.
• Gravimetric method - A preparation method based on weighing the components and calculating the mixture from those masses.
• Class I mixtures - The mixture class named in Part 1 of the standard.
• Amendment - A document that changes an existing standard by replacing specific text or formulae.
• Annex E - The annex that contains formulae corrected by this amendment.
• Annex G - The annex that contains formulae corrected by this amendment.

Who uses SIST EN ISO 6142-1:2015/oprA1:2026?

SIST EN ISO 6142-1:2015/oprA1:2026 is used by laboratories, calibration gas producers, and gas analysis specialists who prepare or verify calibration gas mixtures. It is also relevant to quality managers, metrology staff, and buyers who need to specify how calibration gases are calculated and checked.

Typical tasks include:

• preparing calibration gas mixtures by the gravimetric method
• checking calculation sheets and software
• validating production records for calibration gases
• maintaining consistent calculation practice across a laboratory or production site

What changed in SIST EN ISO 6142-1:2015/oprA1:2026 from the previous edition?

SIST EN ISO 6142-1:2015/oprA1:2026 is Amendment 1 to ISO 6142-1:2015. The amendment corrects formulae in Annex E and Annex G, replacing Formula (E.3), Formula (E.4), and Formulae (G.1) to (G.7).

Which standards are used with SIST EN ISO 6142-1:2015/oprA1:2026?

• ISO 6142-1:2015 - the base standard that this amendment corrects.
• ISO 6142 series - the foreword points users to the series as a whole for related parts.

What does the SIST EN ISO 6142-1:2015/oprA1:2026 document contain?

SIST EN ISO 6142-1:2015/oprA1:2026 contains the amendment notice and the replacement formulae for Annex E and Annex G. It is a short correction document rather than a full technical rewrite of the gravimetric method.

The main content is the set of revised equations, identified by their annex and formula numbers. Users apply these corrections when doing calculations for calibration gas mixture preparation, checking results, or updating supporting software and procedures.