In September 2010, Linde Germany achieved accredited status to manufacture and supply calibration gas stanadards as ISO Guide 34 reference materials containing ppm levels of NO2 and SO2 in a balance of air. The extended accreditation scope covers a range of typical cylinder sizes from 10 to 40 litres and covers mixtures with guaranteed stability for up to 36 months at uncertaintly levels down to 0.8%.
The ISO Guide 34 accreditation was awarded and certified by DAkkS, the new German accreditation body. As part of the accrediation, the mixtures are directly traceable to the SI units of measure with analytical validation provided by the VSL in the Netherlands, one of the world's premier laboratories for gaseous reference materials.
These calibration gas mixtures are in demand for the measurement of air quality and control of gaseous emissions in applications where the highest levels of precision, measurement certainty and traceability are required. The extension of the Linde accreditation scope to include ISO Guide 34 accrediation for sulphur dioxide represents a significant step forward to offer a full solution to environmental monitoring industry in Europe and worldwide.