This document describes several test methods for measuring the ammonia amount fraction in natural gas and biomethane at the trace level (\u00b5mol 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 are comprised 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 \u00b5mol mol-1) level and applies to analysis within absolute pressure ranges of 1 bar \u2013 2 bar, temperatures of 0 \u00b0C \u2013 40 \u00b0C 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.<\/p>\n
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| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 6.1 NH3 analyser 6.2 Gas delivery system <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 6.3 Temperature sensor 6.4 Pressure sensor 6.5 Calibration equipment 6.5.1 General 6.5.2 Pressure regulators for the NH3 cylinders 6.5.3 Flow controller 6.5.4 Flow meter 6.5.5 Dilution device <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 6.5.6 Output manifold 7.1 Methane 7.2 Calibration gases 7.3 Inert gas 8.1 General 8.2 Construction materials <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 8.3 Cleanliness 8.4 Installation of the calibration gas cylinder 8.5 Pressure control 8.6 Purging of reduction valve and transfer lines 8.7 Flow control <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 8.8 Leak control 9.1 Calibration procedures 9.2 Frequency of calibration 9.2.1 Multipoint calibration 9.2.2 Zero and span point calibration 10.1 Interfering absorbers 10.2 Matrix gas <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 10.3 Secondary level spectroscopic effects: Gas temperature, gas pressure, spatial homogeneity 10.4 Humidity and carbon dioxide 12.1 Quantities and units 12.2 Uncertainty <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Analysis of natural gas. Biomethane. Determination of ammonia content by tuneable diode laser absorption spectroscopy<\/b><\/p>\n |