Water vapour monitoring in natural gas in the presence of methanol

► Comparison of several hygrometers for moisture monitoring in natural gas. ► Moisture monitoring during exposure to (10, 170 and 750) μmol/mol methanol. ► Moisture readings were not noticeably affected by exposure to 10 μmol/mol methanol. ► Moisture readings were affected during exposure to (170 and 750) μmol/mol methanol. ► Methanol exposure must be considered when establishing moisture monitoring systems.