White Paper - Uniqair, Purdue University Odor Lab Develop Odor Sampling Procedure

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Courtesy of Uniqair Technologies Ltd.

New Odor Sampling Procedure for high humidity air flow from dryers/coolers

A new odor sampling procedure with nitrogen dilution has been developed by Uniqair and Purdue University’s odor lab for odor evaluation of high humidity airflow from petfood dryers, extruder air conveyer (wet cyclones) and coolers. 

The sample bags will be pre-filled with a specific quantity of ultrapure nitrogen prior to sampling to: 

  • prevent or reduce oxidation of the odors in the sample bag and 
  • reduce interaction with the sample bag surface which is nitrogen pre-conditioned and 
  • prevent condensation and preserve the sample for more accurate odor concentration test results. 

After adding the odor sample from the stack or pilot testunit, the odor lab can determine the added volume and exact nitrogen dilution in the bag. The bag is made of Tetlar or PTFE. 

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