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Proficiency testing study: AQA 22-33 Coal Mine Gas

September/October 2022.

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

Registrations closed 1 July 2022.

Test materials

We will supply each sample:

  • in a 5 L gas cylinder 
  • with a AS2473 Type 20 outlet
  • at approximately 25 bar pressure.

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

  • carbon dioxide: ≤ 20 %
  • nitrogen: ≤ 20 %
  • ethane: ≤ 2 %
  • methane (as balance gas).

Sample distribution and reporting

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


There are 3 price options to participate: 

  • $1450 if we supply sample cylinder at 25 bar, and you return it after testing 
  • $3700 if we supply a sample cylinder at 100 bar and you keep the sample to use as a calibration standard
  • $4300 if we supply 2 cylinders—a calibration standard and a sample—and you return the sample after testing

These prices include GST and delivery to Australian sites.

You will need to pay extra for:

  • all international freight and duty charges
  • return delivery.

To apply

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