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Metrology: air humidity measurement
Air humidity measurement Temperature measurement Liquid flow rate measurement
Gas flows rate measurement Pressure measurement Air velocity measurement


Our laboratory is a national reference of the traceability chain
in the air humidity measurement domain.

CALIBRATION
ACCREDITATION
N°2.21
HYGROMETRY
CALIBRATION
ACCREDITATION
N°2.1116
THERMOMETRY

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Calibration methods

Two methods are used according to the type of instruments to be calibrated.

 1 
Calibration with a recirculation humid air generator:
The dew point temperature (Td) is measured with a reference thermometer put at the level  of the air humidity saturator. The temperature measurement (T) is performed with a reference thermometer put near the sensor to be calibrated. The reference relative humidity (RH) is calculated from those two measurements.
 2 
Calibration in climatic chamber by comparison with a reference hygrometer:
The dew point temperature (Td) is measured with a reference hygrometer. The temperature measurement (T) is performed with a reference thermometer put near the sensor to be calibrated.
The reference relative humidity (RH) is calculated from those two measurements.

Calibration bench using
a recirculation humid air generator


Calibration fields and uncertainties

TYPE OF DEVICE FIELD UNCERTAINTY CALIBRATION
METHOD
Td T HR
Condensation or metallic oxide hygrometer -60°C
to
+80°C
    Td
±0.06°C to ±0.10°C
 1 
Impedance variation hygrometer (capacitive or resistive) measuring the relative humidity -20°C
to
+90°C
5% to 95% HR
±0.3% to ±0.9%
 1 
Electronic psychrometer +5°C
to
+70°C
+15°C
to
+23°C
50% to 95% HR
±0.3% to ±1.3%
Td
±0.13°C
 2 
+23°C
to
+70°C
30% to 95%


Price list

You can download a document including this description and the main calibration prices: calibration in hygrometry.

 
CENTRE TECHNIQUE DES INDUSTRIES AÉRAULIQUES ET THERMIQUES