Gas Standards for Calibrating Evidential Breath-alcohol Analysers
Standard gas mixtures provide an accurate and cost-effective method for calibrating evidential breath-alcohol analysers. They are stable and provide a repeatable reference concentration that can be used for regular calibrations.
Standards are available to measure ethanol concentration in exhaled breath and also to check for possible interferent species as required by OIML R 126:
|
Evidential breath alcohol | ||
| Gaseous Species | Matrix | Amount Fraction Range (mol/mol) |
| Ethanol | Air or Nitrogen | 50×10-6 – 2000×10-6 |
| Methanol / ethanol | Air or Nitrogen | 100×10-6 – 1000×10-6 |
| Acetone / ethanol | Air or Nitrogen | 100×10-6 – 1000×10-6 |
| Toluene / ethanol | Air or Nitrogen | 100×10-6 – 1000×10-6 |
| Methyl ethyl ketone / ethanol | Air or Nitrogen | 100×10-6 – 1000×10-6 |
Other interferent species are also available on request as specified in the OIML guide.
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