National and European legislation, such as vehicle emissions regulations, dictates that emission gases are routinely measured to exacting standards. In order to achieve this, it is necessary to use accurate and traceable gas standards. These standards can also be used for petrol, diesel and gas turbine engine research, as well as a wide range of development and certification work.
NPL provides gas standards for calibrating vehicle emissions monitors, which can be prepared to the requirements of the customer. The table below gives an indication of the available mixtures, others may be available on request.
| Component | Matrix gas | Amount fraction range | |
| From | To | ||
| Carbon monoxide | Nitrogen | 5 mmol/mol | 150 mmol/mol |
| Carbon dioxide | 50 mmol/mol | 150 mmol/mol | |
| Propane | 500 μmol/mol | 5 mmol/mol | |
| Oxygen | 5 mmol/mol | 210 mmol/mol | |
| Carbon monoxide | Nitrogen or air | 1 μmol/mol | 50 mmol/mol |
| Carbon dioxide | Nitrogen or air | 1 μmol/mol | 50 mmol/mol |
| Oxygen | Nitrogen | 1 μmol/mol | 50 mmol/mol |
| Propane | Air | 1 μmol/mol | 50 mmol/mol |
| Nitrogen monoxide | Nitrogen | 1 μmol/mol | 10 mmol/mol |
| Nitrogen dioxide | Air | 1 μmol/mol | 5 mmol/mol |
| n-hexane | Nitrogen | 1 μmol/mol | 1 mmol/mol |
NPL also has a range of particle measurement capabilities to support the quantification of vehicle particulate emissions and the calibration of equipment used to perform those measurements. Further details can be found here.
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Contact our Customer Services team on +44 20 8943 7070