SIST EN ISO 21258:2010 PDF

Overview

EN ISO 21258:2010 specifies a reference method for measuring the mass concentration of dinitrogen monoxide (N2O / nitrous oxide) in flue gas from ducts and stacks. The standard defines the non-dispersive infrared (NDIR) analytical technique and the associated sampling system and sample gas conditioning required for reliable N2O emissions measurement. EN ISO 21258:2010 is intended as a reference method for periodic monitoring and for calibration, adjustment or control of automatic monitoring systems (AMS) permanently installed on a stack. The method has been validated in practical conditions (e.g., sewage sludge incinerator testing with N2O up to about 200 mg/m3).

Key Topics

• Scope and principle: Defines the measurand (mass concentration of N2O) and the NDIR measurement principle for stationary source emissions.
• Sampling system requirements: Specifies sampling location, sampling points and sample-line components to obtain representative stack gas samples.
• Sample conditioning: Details conditioning to remove condensate and particulates and to maintain sample integrity before analysis.
• Analyser equipment (NDIR): Requirements for analyser set-up, calibration with reference gases, and on-site configuration.
• Performance criteria: Defines performance characteristics and procedures to determine measurement performance and measurement uncertainty in line with ISO guidance.
• Quality control and verification: Ongoing QC checks, frequency of tests, leak tests and field evaluation procedures to ensure data reliability.
• Reporting: Rules for expression of results and required content of test reports.
• Annexes: Practical aids including schematic analyser diagrams, test procedures for performance characteristics, example compliance assessments and leak test procedures.

Applications and Users

EN ISO 21258:2010 is aimed at professionals involved in stationary source emissions monitoring:

• Environmental laboratories performing stack gas analysis
• Plant operators and environmental compliance teams (power plants, waste incineration, industrial boilers)
• Manufacturers and integrators of automatic monitoring systems (AMS) using NDIR technology
• Regulatory authorities and consultants conducting periodic emissions monitoring and system calibration

Practical uses include periodic compliance monitoring, calibration and adjustment of permanent AMS, validation of emission inventories, and supporting greenhouse-gas reporting where accurate N2O measurements are required.

Related Standards

Important normative references that support EN ISO 21258:2010:

• ISO 9169:2006 - performance characteristics of automatic measuring systems
• ISO 14956 - evaluating suitability of measurement procedures vs required measurement uncertainty
• ISO/IEC Guide 98‑3:2008 (GUM) - Guide to the expression of uncertainty in measurement

Keywords: EN ISO 21258:2010, N2O emissions measurement, dinitrogen monoxide, non-dispersive infrared (NDIR), stack monitoring, reference method, sampling and conditioning, measurement uncertainty.