wind tunnel

EN 13725 – YES/NO Mode

The assessor is asked to evaluate gas presented from a specific port and to indicate if an odour is perceived ( YES/NO). The assessor is aware that in some cases…

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Flow through hood

A wind tunnel is a device which is used to sample passive sources.  It is essentially a covering or ‘hood’ in which is placed on the surface and neutral gas…

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Micrometeorological method

This is an indirect measurement of passive sources where odour emission is determined by measuring wind velocities and concentrations across the plume profile downwind of the source simultaneously.  The turbulent…

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Odour Source

A location or object that emanates odours.  Sources can be divided by point, area, or volume sources that are of either passive, active or fugitive type.  For example, a rectangular…

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Passive sources

Passive area sources usually and area have no defined flow or a weak flow.  Examples include a waste dump, clarifier or pond.  According to the VDI3880, a passive source has…

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Source sampling

The process of obtaining an odourous sample.  Various equipment and standard methods applied depending on the source characteristics.  For example, a passive area will require different equipment for sampling than…

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