This part of EN ISO 10101 specifies a coulometric procedure for the direct determination of water content by the Karl Fischer method. The method applies to natural gas and other gasses which do not react with Karl Fischer reagents. It applies to water concentrations between 5 mg/cubicmeter and 5 000 mg/cubicmeter. Volumes are expressed at a temperature of 273,15 K (0°C) and a pressure of 101,325 kPa (1 atm).