neutral gas

EN 13725 – Forced Choice Mode

The assessor is presented with two or more ports, of which one presents the stimulus and the other(s) neutral gas.The location of the stimulus in consecutive presentation is randomly distributed…

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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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n-butanol

is the reference material outlined in the EN13725 standard.  One of the criteria in order to become an assessor, is to be able to detect n-butanol between 20ppb to 80ppb…

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New Source Review (NSR)

A Clean Air Act requirement that State Implementation Plans must include a permit review,  which applies to the construction and operation of new and modified stationary sources in Non-attainment areas, to…

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Wind tunnel

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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