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Schedule + Costs: Gas Measurement & Gas Cylinder Proficiency Testing Scheme
2026 Schedule:
Task |
Deadline / Date |
Round 24 Registration Opens |
16th February 2026 |
Round 24 Registration Deadline |
30th May 2026 |
Round 24 Visit to NPL |
7th to 10th July 2026
14th to 17th July 2026
2nd week
depending on demand |
Round 24 Results Submission |
10 working days after testing |
Round 24 Report Issued |
3rd September 2026 |
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, so only a small inflationary rise has been applied to the cost of the scheme in 2026 compared to 2025. There is no increase related to the introduction of HCl.
The price for participation of a single test team in the Gas Measurement & Gas Cylinder Scheme is £4,770.00 + 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. |
