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Odour polarity profiles for industrial permitting procedures
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It is #KnowledgeMonday 💡👩🏫 - Ever heard of polarity profiles for industrial permitting procedures?
This week, our German environmental odour testing team is performing polarity profile measurements at a large food production facility.
We are accredited for performing these tests according to the guideline VDI 3940 Part 4.
We typically apply this test method to determine if the odour from your facility is pleasant, as in that case the odour has a significant lower annoyance potential and will usually lead to fewer complaints. For such pleasant sources, it is allowed to weigh the impact, reduce it by a specific factor and compare this lower impact to the limit value. We typically apply this in permitting procedures.
But how does it work?
Polarity profile measurements take place in different steps.
Initially, each panellist has to produce a polarity profile without an actual odour being present - for both a stench and a fragrance. To do so, they are asked to describe a stench/fragrance by using 29 pairs of opposites (cold - hot, exciting - relaxing, serious - playful, etc.). This step serves as a calibration/qualification method.
In the second step, qualified panellists have to create a polarity profile of the facility odour. Therefore a suitable location has to be found in the odour plume of the facility. After some time of familiarization with the odour, the panellists leave the plume to describe the odour using again the 29 pairs of opposites. The answers are weighted between - 3 and +3 on the profile scale.
The values are multiplied with the specific hedonic factor score for polarity as defined in VDI 3940. Then, the mean value is calculated for the weighted values for each pair of opposites for all panel members.
With these mean values, the environmental odour of your facility is correlated to a typical fragrance or stench profile. In case of a high correlation to the fragrance profile, the reduction factor can be applied to the impact values, as initially described.
Do you want to know if this method could be applicable for your industrial plant? Get in touch with our Olfasense team to find out! Heike Hauschildt and Bettina Mannebeck will be happy to answer your questions.
By the way, polarity profiles are also applied for product and material odour testing purposes. Get in touch with Rita Ribau Domingues to find out more.
#odour #testing #polarityprofiles
This week, our German environmental odour testing team is performing polarity profile measurements at a large food production facility.
We are accredited for performing these tests according to the guideline VDI 3940 Part 4.
We typically apply this test method to determine if the odour from your facility is pleasant, as in that case the odour has a significant lower annoyance potential and will usually lead to fewer complaints. For such pleasant sources, it is allowed to weigh the impact, reduce it by a specific factor and compare this lower impact to the limit value. We typically apply this in permitting procedures.
But how does it work?
Polarity profile measurements take place in different steps.
Initially, each panellist has to produce a polarity profile without an actual odour being present - for both a stench and a fragrance. To do so, they are asked to describe a stench/fragrance by using 29 pairs of opposites (cold - hot, exciting - relaxing, serious - playful, etc.). This step serves as a calibration/qualification method.
In the second step, qualified panellists have to create a polarity profile of the facility odour. Therefore a suitable location has to be found in the odour plume of the facility. After some time of familiarization with the odour, the panellists leave the plume to describe the odour using again the 29 pairs of opposites. The answers are weighted between - 3 and +3 on the profile scale.
The values are multiplied with the specific hedonic factor score for polarity as defined in VDI 3940. Then, the mean value is calculated for the weighted values for each pair of opposites for all panel members.
With these mean values, the environmental odour of your facility is correlated to a typical fragrance or stench profile. In case of a high correlation to the fragrance profile, the reduction factor can be applied to the impact values, as initially described.
Do you want to know if this method could be applicable for your industrial plant? Get in touch with our Olfasense team to find out! Heike Hauschildt and Bettina Mannebeck will be happy to answer your questions.
By the way, polarity profiles are also applied for product and material odour testing purposes. Get in touch with Rita Ribau Domingues to find out more.
#odour #testing #polarityprofiles
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