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Metrology: portable multi-function measuring instruments

 

You can download a document including this description and the main calibration prices for multi-function measuring instruments

Calibration methods

Air humidity measurement

ETALONNAGE
ACCREDITATION
N°2.21
HYGROMETRIE

Calibration in climatic chamber by comparison with a reference hygrometer: the dew point temperature is measured with a reference hygrometer. The temperature measurement is performed with a reference thermometer put near the sensor to be calibrated. The reference relative humidity is calculated from those two measurements.


Measurement of temperatures

ETALONNAGE
ACCREDITATION
N°2.1116
TEMPERATURE

Three methods are used according to the field of temperature:

  • Between -30 and +160°C, the calibration is performed in a climatic chamber by comparison with a 100-ohm platinum resistance thermometer.
  • Between -30 and +215°C, the calibration is performed in an overflowing thermostatically controlled bath, by comparison with a 25 - ohm reference platinum resistance thermometer. Depending on the temperature, the liquid used is either alcohol, water or oil. The thermometer probe must be at least 60 mm long for a diameter below or equal to 6 mm, 150 mm long for a diameter over 6 mm.
  • Between +200 and +1100°C, the calibration is performed in a special furnace by comparison with a type S thermocouple. The diameter of the thermocouple to be calibrated must be below 10 mm and its length must be over 270 mm.


Measurement of air velocities

ETALONNAGE
ACCREDITATION
N°2.58
ANEMOMETRIE

The calibration of the anemometers is performed in a wind tunnel, by direct comparison with a reference.The reference device used by the laboratory over the whole velocity range is a laser-Doppler anemometer (L.D.A.)


Calibration conditions

The calibration conditions are the same that for the one-function instruments. Please refer to the corresponding information.


Measurement of pressures

ETALONNAGE
ACCREDITATION
N°2.160
PRESSION

The calibration of manometers or pressure sensors is performed by direct comparison with a reference. The generated pressure is measured in parallel on the reference and on the pressure sensor to be calibrated.


Calibration conditions

The calibration conditions are the same that for the one-function instruments. Please refer to the corresponding information.


Calibration fields and uncertainties

MEASURING INSTRUMENT FIELD UNCERTAINTY
Impedance variation hygrometer RH from 5 to 95%T
from -20 to +90°C
±0,2% to ±2,2%
Non-underwater thermometer -30°C to +160°C ±0,23°C to ±0,6°C
Underwater thermometer -80°C to +215°C ±0,055°C to ±0,16°C
Thermocouple +200°C to +1 050°C ±1,5°C to ±2,3°C
Anemometer (all types) 0,05 to 2 m.s-1
0,15 to 40 m.s-1
(0,006 + 0,004.Vr)
(0,0014 + 0,0030.Vr)
Vr : Reference speed (in m.s-1).


Price list

You can download a document including this description and the main calibration prices for multi-function measuring instruments.


 
CENTRE TECHNIQUE DES INDUSTRIES AÉRAULIQUES ET THERMIQUES