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CALIBRATION
ACCREDITATION
N°2.1116
TEMPERATURE |
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Calibration methods
Three methods are used according to the field of temperature and the type of sensor: |
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Calibration in air inside a climatic chamber
The calibration is performed in the air of a climatic chamber by comparison with a 100 - ohm reference platinum resistance thermometer.
| TYPE OF DEVICE |
IMPLEMENTED RESOURCES |
| Thermo-hygrometer |
Thermo-anemometer |
| Thermo-recorder |
| Thermo-enregistreur |
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Calibration of thermoters
in a climatic chamber. |
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Calibration in thermostatically controlled baths
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.
| TYPE OF DEVICE |
IMPLEMENTED RESOURCES |
| Platinum Resistance Thermometer |
4-wire resistance measurement with a multimeter or display of the measurements chain |
| Liquid-expansion thermometer |
Instrumental read degree with the help of a cathetometer |
| Thermoelectric couple |
Melting ice bath for the 0°C referenceVoltage
measurement
with a multimeter or display of the
measurements chain |
| Measurements chain |
Display of the measurements chainVoltage or current measurement with a multimeter |
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Calibration in a furnace
The calibration is performed in a 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.
| TYPE OF DEVICE |
IMPLEMENTED RESOURCES |
| Thermocouple |
Melting ice bath for the 0°C referenceVoltage
measurement with a multimeter or display of the measurements chain |
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Calibration conditions
A calibration comprises at least 3 values of temperature
Calibration fields and uncertainties
Underwater devices
| TYPE OF DEVICES |
FIELD |
ENLARGED UNCERTAINTY |
CALIBRATION METHOD |
| Industrial platinum resistance thermometer |
-80°C to +215°C |
±0.06°C to
±0.10°C |
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| Thermocouple |
±0.10°C |
| Liquid-expansion thermometer |
±0.08°C |
| Temperature measurements chain |
±0.06°C to
±0.10°C |
| Thermocouple |
+200°C to +660°C |
±1.5°C |
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+660°C to
+1 050°C |
±1.9°C |
Non-underwater devices
| TYPE OF DEVICES |
FIELD |
UNCERTAINTY |
CALIBRATION METHOD |
| Non-underwater sensor |
-30°C to +160°C |
±0.2°C to ±0.6°C |
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Price list
You can download a document including this description:
calibration in thermometry.
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