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Proficiency testing study: AQA 22-34 Odorants in Natural Gas

October 2022.

This proficiency test is part of the National Measurement Institute's 2022 proficiency testing program for gas mixtures.

Registrations closed 1 August 2022.

This study is limited to 5 participants.

Test materials

We will supply each sample:

  • in a 5 L gas cylinder 
  • with a AS2473 Type 45 outlet
  • at approximately 25 bar pressure.

The gas samples will contain the following components (nominal mole fractions only):

  • THT (tetrahydrothiophene) ≤15 ppm
  • TBM (tert-butylmercaptan) ≤15 ppm
  • methane (as balance gas).

Sample distribution and reporting

  • We will distribute samples by 1 October 2022. 
  • You must submit your measurement results and return the sample cylinders by 1 December 2022.


The cost to participate is $1550.00. This includes GST and delivery to Australian sites.

You will need to pay extra for: 

  • return freight
  • all international freight and duty charges.

To apply

  1. read our proficiency testing terms and conditions.
  2. email with your:
    • contact name
    • phone
    • postal address
    • delivery address
    • organisation
    • ABN.