odour measurements

Assessor

The terms ‘assessor’ and ‘panel member’ are used in the EN13725.  An assessor is a person who participates in odour measurements.  A panel member is an assessor who is qualified…

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Delayed Olfactometry

A time-lag between sampling and measuring of odour concentration where the odour sample is preserved in an appropriate container (odour-netutral material). Can also be referred to as static sampling. Delayed…

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Diffuse sources

A source having a specified area or volume that does not have a defined air flow.  Examples include waste dumps, compost piles, sedimentation tank.  An example that is not a…

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Direct Olfactometry

Measurement of odour without a time lag between sampling and analysis. The time lag between sampling and analysis according to the EN 13725 is 30hours and according to the VDI…

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Electronic Nose

An electronic nose (e-nose) uses a sensor array that reacts to air pollutants by leaving behind a ‘fingerprint’ that can be attributed to an odour.  It is essentially composed of a sample…

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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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Federal Clean Air Act (FCAA)

A federal law passed in 1970 and amended in 1974, 1977 and 1990 which forms the basis for the national air pollution control effort. Basic elements of the act include…

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FIDOL

FIDOL represents frequency, intensity, duration, offensiveness and location.  FIDOL is used as a means to characterize the effects of an odour annoyance. Characterize an odour by its: Frequency – how…

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Hazardous Air Pollutants (HAPs)

Pollutants released into the atmosphere as particles and volatile organic compounds (VOCs) — including the known carcinogens of benzene and toluene — from a variety of sources such as vehicle…

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Hedonic tone

Represents the pleasantness or unpleasantness of an odour.  It is subjective to each person and therefore may evoke an emotional response depending on experiences with that odour.  It measures how…

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