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Schedule + Costs: Gas Measurement & Gas Cylinder Proficiency Testing Scheme
2025 Schedule:
Task |
Deadline / Date |
Round 23 Registration Opens |
14th March 2025 |
Round 23 Registration Deadline |
4th June 2025 |
Round 23 Visit to NPL |
8th to 11th July 2025
15th to 18th July 2025
2nd week
depending on demand |
Round 23 Results Submission |
10 working days after testing |
Round 23 Report Issued |
11th September 2025 |
The Gas Measurement & Gas Cylinder Scheme will be conducted at NPL. Measurements of three test concentrations and gas cylinders will be completed in one day. The details for testing on the day can be found in the individual protocols located at: Forms and Protocols.
Range of concentrations for Gas Measurement Component:
Pollutant |
Maximum |
Minimum |
Unit |
SO2 |
100 |
5 |
PPM |
NO |
190 |
10 |
PPM |
NO2 |
60 |
2 |
PPM |
CO |
100 |
5 |
PPM |
C3H8 |
9.9 |
1 |
PPM |
O2 |
17 |
2 |
% |
H2O |
20 |
1 |
% |
NPL have been working hard to introduce efficiency measures to keep costs as low as possible for the gases scheme, but have faced inflationary pressures over the last couple of years. To ensure the continued provision of a high-quality, scientifically robust PT scheme that meets the rigorous standards of UKAS accreditation, we must adjust our pricing to reflect the increasing expenses associated with delivering and sustaining this essential service.
The price for participation of a single test team in the Gas Measurement & Gas Cylinder Scheme is £4,586.00 + VAT.
Test teams may report up to 2 instruments per determinand for both the Gas Measurement and Gas Cylinder components.
Participants will be invited to set up instrumentation the day before testing, between 4pm and 6pm only.
Companies participating in the Scheme will be listed the following year on this website. An option to opt out is available when registering.
Please note that NPL is within the ULEZ zone and it is the responsibility of participants to check if they are required to pay the fee on days when they attend the NPL site. Please see the TfL website for more details.
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