1998-02-23

Micro SHED 980402

The aim of this method is to measure emissions from components in the fuel system in a way that is comparable with regulated measurements by Sealed Housing for Evaporative Determination (SHED). In a circuit, constructed as a differential reactor, air is circulated between a test cell and a flame ionization detector (FID) for total hydrocarbon measurement. A test object, i.e. a fuel system component, is filled with fuel and placed in a sealed test cell. Due to the flow characteristic, equilibrium will occur between the air and the fuel evaporated from the surface of the test object. The amount of air consumed in the reactor is compensated by pure air being added to the system. The concentration of hydrocarbon in the circulated air is continuously measured by the FID.

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