Patent ID: 8567266

Claim:
A method of measuring dust in a flowing gas, comprising: a) measuring a first velocity of the flowing gas through an intake nozzle, b) measuring a second velocity of the flowing gas along the direction of gas flow, c) in the gas flowing through the intake nozzle, at least one of measuring dust particle size, separating out dust, or a combination thereof, wherein in (c) the intake nozzle is continuously positioned aerodynamically along the direction of gas flow, wherein two independently movable conically shaped members, a diffuser and a fairing, are positioned along the direction of gas flow, wherein the two members include vertical stabilisers, wherein the diffuser includes the intake nozzle therein and the fairing has a form of a deflector and includes an exhaust nozzle therein, d) comparing the first velocity of the flowing gas through the intake nozzle with the second velocity of the flowing gas around the intake nozzle, and e) reducing the eventual differences between the first and second velocities by changing a velocity of the gas flowing through the intake nozzle between the diffuser and the fairing with a suction pump.