The detection threshold for that group of assessors. It is influenced by each panellist in the group. Due to the requirement that each panellist must fit within the “norm” during the panel screening, it can be concluded that individually they will detect a sample odour relatively close to that of the other panel members. Collectively, their initial sense of the odour sample is known as the “Group Threshold”

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EN13725 defines the following criteria for panellist screening:

• Have a detection threshold of n-butanol between 20ppb to 80ppb
• requires the assessor to be at least 16 years of age
• must be motivated and diligent to carry out duties
• available for the complete measurement session
• participated sufficiently to build a history of measurements
• may not eat, drink (except water), or smoke 30 min before the measurement
• not create interference from personal hygiene or perfume products
• refrain from participating in measurements if the assessor’s perception of odour is diminished (i.e. cold, allergies, etc.)
• assessors will remain in the odour room for 15min prior to beginning measurement to adapt to the room
• Panel members shall not communicate or influence one another

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Certain criteria must be met in order to perform odour measurements.  For instance, EN13725 essentially outlines the following criteria:

• Have a detection threshold of n-butanol between 20ppb to 80ppb
• requires the assessor to be at least 16 years of age
• must be motivated and diligent to carry out duties
• available for the complete measurement session
• participated sufficiently to build a history of measurements
• may not eat, drink (except water), or smoke 30 minutes before the measurement
• not create interference from personal hygiene or perfume products
• refrain from participating in measurements if the assessor’s perception of odour is diminished (i.e. cold, allergies, etc.)
• assessors will remain in the odour room for 15 minutes prior to beginning measurement to adapt to the room
• Panel members shall not communicate or influence one another

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