Fog Sampler
PRINCIPLE OF FOG COLLECTION
Fog Sampler ANES 220
Fog water is collected with a sampler operating on the impactor principle (see figure). The air is sucked at a rate of rd. 120 m³/h through a twin nozzle behind . A specially designed deposition body is placed onto which the fog droplets are impacted. The deposition body has a vertically oriented hole in its centre which is connected to the impaction surface by numerous small bored holes. The centre hole and the instruments exits are connected by tubes so that a slight under pressure is applied sustaining a slight air flow through the capillary holes. The deposition body has a small rim at each side preventing the deposited water from being ripped off and carried away with the fast air stream. The fog droplets which are deposited coagulate and this water is sucked into the small holes due to capillary forces and under pressure and drains into the centre from where it flows into the collection device. By this way a rapid separation of the collected water from the strong air stream behind the nozzle is reached and problems as evaporation or continuing reactions are minimized. Behind the nozzle the air is guided by semicircular surfaces to the exit in order to avoid turbulences.
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