ISO 6327:1981

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Gas analysis — Determination of the water dew point of natural gas — Cooled surface condensation hygrometers

ISO 6327:1981 refers to an International Standard that outlines the method for determining the water dew point of natural gas using "cooled surface condensation hygrometers," essentially devices that detect water vapor condensation on a chilled surface to measure the moisture content in a gas sample; published by the International Organization for Standardization (ISO) in 1981.