Because the composition of natural gas changes over time due to changes in the natural gas reservoir and other factors there is a need to sample the gas to determine its composition. Sampling of natural gas to determine the composition is important for custody transfer and fiscal metering so that both buyers and sellers are confident of a fair transaction. Contracts are typically concerned with the BTU or energy content of the gas and the hydrocarbon dew point of the gas. There are many robust automatic gas sampling systems such as on-line GCs (Gas Chromatographs) in the field that can perform on-line sampling. These are systems are expensive, require frequent maintenance and are usually only justified when large volumes of gas are being moved.
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