NOVELTY - A system for on-line detection and measurement of evolved gases, has oil filled equipment, conservator tank, air release valve, mechanism for controlling oil flow, mechanism for sensing and characterization of evolved gases, mechanism for amplifying output signals, mechanism for measuring and displaying concentration of evolved gases, and mechanism for sending signals to programmable device.    USE - The invention is used for on-line detection and measurement of evolved gases such as acetylene, hydrogen, methane, ethylene, ethane, carbon monoxide, carbon dioxide, and/or composite hydrocarbons in oil filled equipment (claimed).    ADVANTAGE - The invention provides an advance, automated, on-line, reliable, and quick process and apparatus of fault monitoring for the fluid filled systems. It provides detailed fault diagnosis including fault initialization, fault confirmation, type of fault, aging process, and system error fault.    DETAILED DESCRIPTION - The system for on-line detection and measurement of evolved gases in oil filled equipment comprises oil filled equipment (2) with top cover plate having mechanism for outflow of evolved gases to a gas trapping device for trapping evolved gases between the conservator tank and the top cover plate; conservator tank (6) connected with the gas trapping device to maintain level of oil in the oil filled equipment; air release valve at a top end of the gas trapping device for release of evolved gases; mechanism for controlling oil flow in the evolved gases from entering the sensing apparatus; mechanism (8) for sensing and characterization of evolved gases coming out through the air release valve; mechanism for amplifying output signals coming out of the sensing mechanism and transmitting it to monitoring mechanism; mechanism for measuring and displaying concentration of evolved gases with programmable audio and visual alarm settings; and mechanism for sending signals to programmable device for analyzing, reporting, and corrective actions.    DESCRIPTION OF DRAWING(S) - The figure depicts a schematic diagram of Loco Transformer with created gas trapping point with installed apparatus.    Locomotive transformer (1)    Oil filled equipment (2)    Gas bubbles (3)    Inclined metal barrier (4, 5)    Conservator tank (6)    Gas trapping point (7)    Sensing apparatus (8)    Sheath cable (9)