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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

22. 22 HUMIDITY  Salt Solutions Generator ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA Salt/Temperature o C5.010.015.020.025.0 Lithium chloride11.3 Magnesium chloride33.633.533.333.132.8 Potassium carbonate43.1 43.2 Sodium bromide63.562.260.759.157.6 Sodium chloride75.7 75.675.775.3 Potassium chloride87.786.885.985.184.3 Potassium sulphate98.598.297.997.697.3

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

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

25. 25 HUMIDITY  Recommendations –The target uncertainty within a calibration laboratory = 2 % RH (0.3 o C dew point) –Labs should have a humidity generator or chamber: within the range 5 % RH at 15 o C to 90 % at 40 o C. –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 0.2 o C 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 ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA

26. 26 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 ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA

27. 27 THE END THANKS FOR YOUR PATIENCE