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CALIBRATION
ACCREDITATION
N°2.21
HYGROMETRY |
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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. |
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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. |
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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. |
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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 |
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Td
±0.06°C to ±0.10°C |
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| Impedance variation hygrometer (capacitive or resistive) measuring the relative humidity |
-20°C
to
+90°C |
5% to 95% |
HR
±0.3% to ±0.9% |
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| 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 |
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+23°C
to
+70°C |
30% to 95% |
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Price list
You can download a document including this description and the main calibration prices:
calibration in hygrometry.
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