Patent ID: 8767211

Claim:
A process for the selective determination of a quantity of oil mist or a quantity of aerosols in a gas sample, the process comprising the steps of: providing a device, which has an impactor as a measuring transducer, which has micronozzles for dispensing a predetermined test gas flow and which has a deflector plate downstream of the micronozzles for depositing a non-rotationally symmetrical pattern of aerosol or oil particles on said deflector plate; providing an optical analyzing device; dispensing the predetermined test gas flow to deposit the non-rotationally symmetrical pattern of aerosol or oil particles on the deflector plate; rotating the deflector plate relative to the optical analyzing device, about a symmetry axis of the measuring transducer; determining a quantity of oil deposited by means of the optical analyzing device from an absorbence of a light beam reflected from the deflector plate due to an alternation between gray values of the background and of the pattern.