Guidelines are given for the use of olfactometers for dynamic dilution . The olfactometer uses a gas jet pump which thoroughly mixes the metered odorous flow and the constant neutral air flow. The mix is presented as concentration step for odour to panelist through a nose mask for evaluation. The threshold evaluation requires yes\/no decision confirming the detection of odours. Two instruments are presented (Olfactometers Model 1158 and TO 4) with their apparatus diagram representing the components and the air and odour flows. For the first model 1158, an operator does all the procedures so the panelists only have to test the mixed samples. For the TO 4 which is a portable measuring device, the panelist is also the operator. Panelists selection has to be done in order to make sure that the persons’ sense of smell is normal and that they can follow the operator’s instructions. External disturbance should be avoided when the panelists are making the measurements as odours, noise, vibrations can affect the concentration and the odour sensation. Also verifications should be made to assure that the air mix reaching the nose mask does not contain toxic gases. The dilution system should be calibrated prior to the first use and at least annually using suitable test gases (propane or n-butane in test gas bottles) and gas analyzers. Measuring procedures are also provided. The instruments presented can be used in odour intensity determination and to determine the hedonic tone of an odour. A minimum dilution concentration has to be considered for each instrument considering their technical limits. For the instruments presented, determination of odorant concentration below 15 OU\/m3 should not be allowed.<\/p>\n
Detailed information is given for the dynamic dilution tests. However, this information is not precise enough regarding the apparatus and technical specifications. References to VDI 3881 Part 1 and 2.<\/p>\n","protected":false},"excerpt":{"rendered":"
Guidelines are given for the use of olfactometers for dynamic dilution . The olfactometer uses a gas jet pump which thoroughly mixes the metered odorous flow and the constant neutral air flow. The mix is presented as concentration step for odour to panelist through a nose mask for evaluation. The threshold evaluation requires yes\/no decision […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[16337,8882,13816,205,4663,206,316,14180,20007,27247,207,10859,1039,198,17454,199,200,2293,23583,202,208,13508,209,23208,16262,411,236,20911,4874,1579,6053,13648,19871],"class_list":["post-1723","post","type-post","status-publish","format-standard","hentry","category-environment","tag-1158-olfactometry","tag-al","tag-ass","tag-determination","tag-don","tag-evaluation","tag-gas","tag-geruchsschwellenbestimmung","tag-gh","tag-list","tag-measurement","tag-nat","tag-noise","tag-odor","tag-odor-threshold-determination-air","tag-odors","tag-odour","tag-odour-threshold","tag-odour-threshold-determination","tag-odours","tag-olfactometer","tag-olfactometer-with-gas-jet-dilution","tag-olfactometry","tag-olfaktometer-typ-to4","tag-pl","tag-samples","tag-sampling","tag-t","tag-tan","tag-test","tag-use","tag-vdi-3881","tag-vdi-3881-part-1"],"_links":{"self":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/1723","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/comments?post=1723"}],"version-history":[{"count":0,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/1723\/revisions"}],"wp:attachment":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/media?parent=1723"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/categories?post=1723"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/tags?post=1723"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}