This page belongs to: National Measurement Institute

AQA 24-33 stack and exhaust gases

August 2024

This proficiency test is part of our 2024 proficiency testing (PT) program for gas mixtures. The study is covered by our PT provider accreditation (ISO 17043). 

Registrations close 1 June 2024.

Test materials

We’ll prepare and distribute each PT sample: 

  • in a 5 L gas cylinder with the cylinder valve outlet: AS2473 Type 44 (please note the change to the valve outlet type)
  • at around 25 bar pressure.

Gas samples will contain these components (nominal amounts only):

  • Sulphur dioxide ≤ 0.1 % mol/mol
  • Carbon dioxide ≤ 10 % mol/mol 
  • Carbon monoxide ≤ 0.1 % mol/mol
  • Oxygen ≤ 10 % mol/mol
  • Nitrogen as balance.

Sample distribution and reporting


  • distribute samples by 1 August 2024
  • issue the PT report in December 2024.

Once you’ve completed the study you must:

  • submit your measurement results by 1 October 2025
  • include a brief description of the test method
  • include an expanded measurement uncertainty estimate, if applicable.

You must then return the sample cylinders by 15 October 2024.


The cost to participate is $1,600 and includes:

  • goods and services tax (GST)
  • delivery to Australian sites. 

You must pay extra for:

  • return freight
  • all international freight and duty charges.

To apply

Read out proficiency terms and conditions. Then email with your:

  • contact name
  • phone
  • delivery address
  • organisation
  • ABN, if you’re an Australian participant.