Gas Standards for Calibrating Air Quality Monitors
Standard gas mixtures are an accurate and cost-effective method for calibrating air quality monitors. They are stable and provide a repeatable reference concentration that can be used for regular calibrations. They are suitable for calibrating all types of analyser (including flame photometric, UV fluorescence, chemiluminescence and optical UV or IR).
Each air quality standard contains one or more accurately-weighed component mixed with nitrogen or air.
Mixtures that meet the requirements of the EU Air Quality Directive are available with the following components:
| Air Quality | ||
| Gaseous Species | Matrix | Amount Fraction Range (mol/mol) |
| Sulphur dioxide | Nitrogen or Air | 50×10-9 – 500×10-9 |
| Nitric oxide | Nitrogen | 50×10-9 – 500×10-9 |
| Nitrogen dioxide | Nitrogen or Air | 50×10-9 – 500×10-9 |
| Carbon monoxide | Air | 1×10-6 – 500×10-6 |
Full information about NPL standard mixtures of volatile organic compounds is available.
NPL's gas standards are certified for a period up to three years depending on the stability of the mixture. NPL offers a cost-effective re-certification service after the initial certification period has expired, ensuring temporal consistency of gas traceability.
Contact
Customer Service tel: +44 20 8943 8637
E-mail: gases_enquiries@npl.co.uk