UNE-EN ISO 2612:2024

This document describes several test methods for measuring the ammonia amount fraction in natural

gas and biomethane at the trace level (¼mol mol-1). The suitable handling and sampling of pressurised

mixtures of ammonia in methane that are applied to several different ammonia measurement systems

are described. The measurement systems comprise of readily available commercial spectroscopic

analysers that are specific to ammonia. These NH3 analysers are considered as a black box in terms of

their operation, which is dependent on the instructions of the manufacturer. The document describes

suitable calibration and measurement strategies to quantify ammonia in (bio)methane around and

above the 10 mg m-3 (14 ¼mol mol-1) level and applies to analysis within absolute pressure ranges of

1 bar 2 bar, temperatures of 0 °C 40 °C and relative humidity < 90 %.

References are also made to additional standards that are applied either to Natural Gas analysis or

Air Quality measurements. In this document the matrix gas is always methane or biomethane and the

measurand is the amount fraction NH3.

NOTE 1 bar = 0,1 MPa =105 Pa; 1 MPa = 1 N/mm2