NOVELTY - The method involves extracting gas from a side of a gas permeable polymer membrane. The extracted gas is circulated through a fluid loop i.e. gas circulation loop, where the fluid loop and another fluid loop i.e. oil circulation loop, are separated by the gas permeable polymer membrane. Pressure differential is controlled across the gas permeable polymer membrane to predetermined pressure differential. The extracted gas is provided to a gas analysis unit placed within the former fluid loop. Chemical makeup of the extracted gas using the gas analysis unit is periodically determined.    USE - Method for analyzing gas e.g. ethylene, acetylene, hydrogen, carbon monoxide, carbon dioxide, methane, ethane, oxygen and nitrogen, dissolved within a fluid filled asset e.g. dielectric oil filled transformer and dielectric oil filled load tap changer (all claimed), utilized in a power industry.    ADVANTAGE - The method enables monitoring health of the oil filled asset for presence of dissolved gases within oil in a cost-effective manner. The method enables introducing a minimal sample to a non-dispersive infrared (NDIR) instrument to ensure that the gas in the fluid loop remains in equilibrium with the gas in another fluid loop, thus improving measurement accuracy and repeatability of the instrument. The method enables stabilization of pressure and temperature to ensure that equilibrium is maintained across the membrane, thus increasing accuracy and flexibility of the asset and reducing time required to make dissolved gas measurement. The method enables valves to isolate asset internal oil volume from a gas separator, thus eliminating risk of rupture of the membrane of the gas separator due to uncontrolled pressure fluctuations at an inlet or outlet due to changing conditions in and around the oil filled asset.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a system for analyzing dissolved gas in a fluid filled asset.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of a system for monitoring asset health by dissolved gas measurement.    Oil filled transformer (101)    Load tap changer (103)    Transformer main tank (105)    Oil fill inlet (109)    Oil fill line (111)