Aerosol Tunnel Sampler


It is well known that sampling biases are best prevented when the air is not accelerated at the inlet tube. This means, that the air is sucked in at the same speed and the same direction as the ambient air i.e., isokinetic sampling. This is commonly done by stack sampling. An Aerosol Tunnel Sampler
However, outdoor windspeed and wind direction are constantly varying, so that tuning the suction velocity to ambient conditions is a difficult matter. These considerations have led to the design of the Aerosol Tunnel Sampler.

The Aerosol Tunnel Sampler consists of a thin walled tube with a diameter of 0.15 m and a length of 0.32 m. A fan is mounted on the backside generating a constant air flow of 9 m/s through the tunnel. Inside the tunnel, a filterholder with a 10 mm diameter thin walled inlet is mounted. Air is sucked in through the filterholder with the same velocity of 9 m/s. The tunnel's air intake is kept pointed towards the wind by means of a weather vane.
The Aerosol Tunnel Sampler proved to sample total airborne dust representatively under various atmospheric conditions.



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