SIST ISO 13271:2013/A1:2025 PDF

Overview

ISO 13271:2012/Amd 1:2025 is Amendment 1 to ISO 13271:2012, the international standard for determining PM10 and PM2.5 mass concentrations in flue gas from stationary sources. The amendment updates terminology, corrects formulae and symbols, and refines equipment and measurement parameter specifications to improve accuracy when measuring higher particulate concentrations using virtual impactors.

Key topics and technical changes

• Scope refinement: replaces the term “high humidity” with “high water vapour” for greater precision in gas condition descriptions.
• Formula and notation corrections: multiple editorial fixes to symbols in Clause 6.4.3 and annexes (e.g., q, Vi, D0,i, St50,i) to ensure correct calculation inputs.
• Nozzle / hardware dimensions: effective nozzle diameter changed from 18 mm → 14 mm (Clauses 7.2.1 and Annex F).
• Instrument resolution: Annex F table corrected from 0.01 mg → 0.1 mg resolution.
• Annex and figure updates: updated separation-efficiency curves (Figure C.2 replacement), key value adjustments (e.g., 8.0 μm → 7.5 μm), and corrected key labels (