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A FIRST REVIEW OF CALIBRATION DEVICES ACCEPTABLE FOR METROLOGY LABORATORY

A FIRST REVIEW OF CALIBRATION DEVICES ACCEPTABLE FOR METROLOGY LABORATORY. Mr Drago GROSELJ Dr Jérôme DUVERNOY Dr John GORMAN www.arso.sigov.si www.meteo.fr www.bom.gov.au Drago.Groselj@gov.si Jerome.Duvernoy@meteo.fr j.gorman@bom.gov.au.

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A FIRST REVIEW OF CALIBRATION DEVICES ACCEPTABLE FOR METROLOGY LABORATORY

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  1. A FIRST REVIEW OFCALIBRATION DEVICES ACCEPTABLEFOR METROLOGY LABORATORY Mr Drago GROSELJ Dr Jérôme DUVERNOY Dr John GORMAN www.arso.sigov.siwww.meteo.fr www.bom.gov.au Drago.Groselj@gov.siJerome.Duvernoy@meteo.fr j.gorman@bom.gov.au

  2. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA Specialization • PRESSURE • TEMPERATURE • HUMIDITY

  3. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA PRESSURE • Primary Pressure Standard M = Mass P = Piston C = Cylindre Weight = Pressure

  4. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA PRESSURE • Primary Pressure Standards Dead weight gauge

  5. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA PRESSURE • Advantages: • Traceability to mass and length • Long term stability • Accuracy, reproducibility, reliability and stability

  6. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA PRESSURE • Disadvantages: • Time consuming • Measurements corrections (T, g, U…)

  7. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA PRESSURE • Secondary Pressure Standard Quartz Barometer

  8. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA PRESSURE • Advantages: • Faster and easier to use • Easy to adapt to automatic operation • Generally less expensive

  9. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA PRESSURE • Disadvantages: • Not a basic measurement • Higher measurement uncertainty

  10. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA PRESSURE • Travelling pressure standard An example of electronic barometer

  11. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA PRESSURE • Calibration systems example of a barometric chamber

  12. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA PRESSURE • Calibration systems example of a pressure generator

  13. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA TEMPERATURE • EIT 90 METEOROLOGY

  14. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA TEMPERATURE • EIT 90 Gallium Mercury Water

  15. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA TEMPERATURE • Standard Platinum Resistance Thermometer (SPRT) Example of an SPRT

  16. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA TEMPERATURE • Means of calibration Stirring bath

  17. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA TEMPERATURE • Means of calibration Climatic chamber

  18. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA HUMIDITY • Humidity Generators Two Pressure Humidity Generator

  19. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA HUMIDITY • Humidity Generators Split stream system

  20. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA HUMIDITY • Climatic Chambers Environmental Chamber

  21. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA HUMIDITY • Climatic Chambers Split stream chamber

  22. Salt/Temperature oC 5.0 10.0 15.0 20.0 25.0 Lithium chloride 11.3 11.3 11.3 11.3 11.3 Magnesium chloride 33.6 33.5 33.3 33.1 32.8 Potassium carbonate 43.1 43.1 43.1 43.2 43.2 Sodium bromide 63.5 62.2 60.7 59.1 57.6 Sodium chloride 75.7 75.7 75.6 75.7 75.3 Potassium chloride 87.7 86.8 85.9 85.1 84.3 Potassium sulphate 98.5 98.2 97.9 97.6 97.3 ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA HUMIDITY • Salt Solutions Generator

  23. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA HUMIDITY • Salt Solutions Generator The salt solution system at Meteo France

  24. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA HUMIDITY • Approximate Uncertainties

  25. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA HUMIDITY • Recommendations • The target uncertainty within a calibration laboratory = 2 % RH (0.3 oC dew point) • Labs should have a humidity generator or chamber: within the range 5 % RH at 15 oC to 90 % at 40 oC. • The streams or parcels should be stable to within ± 0.2% RH per minute • If the source of humidity is not a first principles device, then measurement of the humidity should be with a dew point hygrometer with an 95 % uncertainty of 0.2oC or better • Calibration of field humidity probes should be done with a view to maintaining a low overall uncertainty. The whole of measurement cycle, including inspection frequency, must be considered and appropriate levels of calibration uncertainty applied

  26. ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA CONCLUSION • Some possibilities in terms of calibration. • This first review is not exhaustive • Every other remaining devices, standard, generator not presented here are still acceptable • Metrology is the science of measurement • Expression of the uncertainty

  27. THE END THANKS FOR YOUR PATIENCE

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