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W-CGM working mixtures

Contattaci Gas Speciali

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W-CGM working mixtures

The W-CGMs are prepared individually, following an accredited internal method that provides a metrologically traceable mixture, but with a higher uncertainty than the G-CGMs. The W-CGMs guarantee traceability in all those cases where measurement uncertainty is not a binding factor.

The certified value is traceable, via an unbroken chain of comparisons, to the national mass samples certified by Primary Metrology Institutes or Accredited Calibration Centres. Following the preparation, the gravimetric concentration of the mixture is analyzed with the aim of confirming the result.

Certification uncertainty is calculated on the basis of the mixture production process; this uncertainty may vary, depending on the requested concentration, in percentages ranging between 1 and 10%.

W-CGMs are also available as a multi-component gas mixture in line with the compatibility constraints due to the chemical-physical characteristics of the gases.

The main recommended applications are:

  • verification of measurement processes in the area of gas analysis.

Working standard