Olfactometer

An olfactometer is an instrument used to detect and measure odor dilution. Olfactometers are used in conjunction with human subjects in laboratory settings, most often in market research, to quantify and qualify human olfaction. Olfactometers are used to gauge the odor detection threshold of substances. To measure intensity, olfactometers introduce an odorous gas as a baseline against which other odors are compared. Many scientists use the term "olfactometer" to refer to a device used to study insect behavior in presence of an olfactory stimulus. It consists of a tube with a bifurcation (with "T" or "Y" shape) where an insect walks and decides between two choices, usually clean air versus air carrying an odor. This is why this device is also called dual choice olfactometer. Alternatively, an olfactometer is a device used for producing aromas in a precise and controlled manner.

An olfactometer is an instrument used to detect and measure odor dilution. Olfactometers are used in conjunction with human subjects in laboratory settings, most often in market research, to quantify and qualify human olfaction. Olfactometers are used to gauge the odor detection threshold of substances. To measure intensity, olfactometers introduce an odorous gas as a baseline against which other odors are compared. Many scientists use the term "olfactometer" to refer to a device used to study insect behavior in presence of an olfactory stimulus. It consists of a tube with a bifurcation (with "T" or "Y" shape) where an insect walks and decides between two choices, usually clean air versus air carrying an odor. This is why this device is also called dual choice olfactometer. Alternatively, an olfactometer is a device used for producing aromas in a precise and controlled manner. ==Field olfactometry== Field olfactometry can be a useful tool in validating odor complaints, or determining odor levels for various locations. Field olfactometers provide the same basic function of a laboratory olfactometer but are designed to be used by a single panelist to measure ambient odors. To be classified as a field olfactometer the device must be able to provide accurate and controlled dilution of the ambient air with odorless air and present the diluted sample to the panelist at controlled and positive air flow. The Nasal Ranger, developed by St. Croix Sensory, is a common brand of field olfactometer used in wastewater treatment plants, industrial facilities, and marijuana grow houses. ==Verifying odorant level in natural gas== Natural gas odorant concentrations are required to be readily detectable at one-fifth of the lower flammable limit of the gas by state and federal regulation. Many gas companies utilize olfactometers to verify this standard. The ASTM has published a standard test method for this determination. ==See also== Electronic nose Electrogustometry Machine olfaction ==References== CEN 13725:2003 - Air quality - Determination of odour concentration by dynamic olfactometry; German version EN 13725:2003.

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