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A FIRST REVIEW OF CALIBRATION DEVICES ACCEPTABLE FOR METROLOGY LABORATORY
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Transcript of A FIRST REVIEW OF CALIBRATION DEVICES ACCEPTABLE FOR METROLOGY LABORATORY
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A FIRST REVIEW OFCALIBRATION 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
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Specialization
PRESSURE
TEMPERATURE
HUMIDITY
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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PRESSURE
Primary Pressure Standard
M = Mass
P = Piston
C = Cylindre
Weight = Pressure
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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PRESSURE
Primary Pressure Standards
Dead weight gauge
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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PRESSURE
Advantages:
– Traceability to mass and length
– Long term stability
– Accuracy, reproducibility, reliability and stability
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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PRESSURE
Disadvantages:
– Time consuming
– Measurements corrections (T, g, U…)
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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PRESSURE
Secondary Pressure Standard
Quartz Barometer
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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PRESSURE
Advantages:
– Faster and easier to use
– Easy to adapt to automatic operation
– Generally less expensive
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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PRESSURE
Disadvantages:
– Not a basic measurement
– Higher measurement uncertainty
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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PRESSURE
Travelling pressure standard
An example of electronic barometer
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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PRESSURE
Calibration systems
example of a barometric chamber
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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PRESSURE
Calibration systems
example of a pressure generator
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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TEMPERATURE
EIT 90
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
METEOROLOGY
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TEMPERATURE
EIT 90
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
Gallium
Mercury
Water
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TEMPERATURE
Standard Platinum Resistance Thermometer (SPRT)
Example of an SPRT
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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TEMPERATURE
Means of calibration
Stirring bath
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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TEMPERATURE
Means of calibration
Climatic chamber
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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HUMIDITY
Humidity Generators
Two Pressure Humidity Generator
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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HUMIDITY
Humidity Generators
Split stream system
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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HUMIDITY
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
Climatic Chambers
Environmental Chamber
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HUMIDITY
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
Climatic Chambers
Split stream chamber
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HUMIDITY
Salt Solutions Generator
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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
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HUMIDITY
Salt Solutions Generator
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
The salt solution system at Meteo France
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HUMIDITY
Approximate Uncertainties
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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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
ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA
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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
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THE END
THANKS FOR YOUR PATIENCE