To ensure efficient transportation of natural gas through main gas pipelines at their working pressure, it is essential to have reliable data on the dew point temperature. Using moisture content analyzers based on sorption capacitive sensors appears to be promising and economically efficient solution for this issue. However, such sensors’ readings depend significantly on analyzed gas pressure, which makes it difficult to interpret the data obtained. The study examines gas pressure impact on dew point measurement results for two different sorption capacitive sensor models. It is shown that deviation sign of the measured value from the true value depends on material used in moisture-sensitive layer, and the absolute error grows with the pressure increase. A hardware-software method is developed to compensate measurement errors. A method is proposed for consideration of gas pressure impact when using sorption capacitive sensors in commercial gas analyzers.
Keywords: DEW POINT TEMPERATURE, MEASUREMENT, MOISTURE SENSOR, PRESSURE, SORPTION CAPACITIVE METHOD.