Gas Standards for Calibrating Stack Emission Monitors
Standard gas mixtures provide and accurate and cost-effective method for calibrating stack gas emission 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 non-dispersive infrared, flame photometric, UV fluorescence, chemiluminesence and optical UV or IR).
Each stack gas emission standard contains one or more accurately-weighed components. Binary and multi-component mixtures are available with the following components:
|
Industrial emissions |
||
| Gaseous Species | Matrix | Amount Fraction Range (mol/mol) |
| Carbon monoxide | Nitrogen or Air | Down to 1×10-6 |
| Carbon dioxide | Nitrogen or Air | Down to 1×10-6 |
| Oxygen | Nitrogen | Down to 1×10-6 |
| Nitric oxide | Nitrogen | 1×10-6 - 5×10-2 |
| Nitrogen dioxide | Air | 100×10-6 - 2×10-2 |
| Ammonia | Nitrogen | 1×10-6 - 0.1×10-2 |
| Hydrochloric acid | 1×10-6 - 100×10-6 | |
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