Members are evaluated to determine if they are fit candidates for odour measurement.  Specific criteria must be met, for example, age etc.  In the EN13725 standard, n-butanol is used to determine what a person’s olfactory response may be. 

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Measurement of odour without a time lag between sampling and analysis. The time lag between sampling and analysis according to EN13725 is 30hours and according to the VDI3880 is 6 hours. This is to prevent the degradation of odour concentration. Ambient odour monitoring using a device that samples the air at specified dilutions is an example of direct olfactometry.

Source sampling and immediate measuring of odour concentration, equivalent to dynamic sampling or on-line olfactometry. It is advantageous when compared to delayed olfactometry as it minimizes the risk of sample modifications due to storage and transportation. This technique is not currently applied in the UK. Direct olfactometry can be very expensive due to the need for panellists to travel to the site of an odour event and the risk that the presence of the test person at the site may affect their response.

Field Olfactometry Advances

Recent advancements in field olfactometry such as the introduction of SM100i, have made this method more feasible and considerably more economical than delayed olfactometry.

This technique can also be used as a proactive monitoring tool providing real-time analysis.

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Sampling materials used throughout the odour measurement process (from obtaining a sample to analysis) require an absent or minimized inference with the odorant gas. The main criteria for the material of the sampling container/bag or device are outlined below:

• The material be inert with the odorous gas
• The material be odourless
• Material be of low permeability to prevent diffusion of odorant gas and outside environment across the material
• Opaque so as to prevent odorous gas from reacting/degrading with sunlight
• Impervious so as to
• Smooth surface

Inert Materials

Materials listed below are inert:

• Polytetrafluoroethylene (PTFE, Teflon TM)
• the copolymer of Tetrafluoroethylene and Hexafluoropropylene (FEP)
• Polyethylene terephthalate (PET, Nalophan TM )
• glass (disadvantage: fragility)
• steel (advantage: high mechanical and thermal stability; disadvantage: not always chemically inert, condensations or other depositions)

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This refers to conducting an odour measurement at a specific dilution for one assessor. A series of these presentations are administered to a panel in order to conduct odour measurements. Presentations can be done on a variety of Scentroid products, including the SM100, and SM100i where a single assessor determines the detection threshold and the recognition threshold.

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