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Our means:
Calibration laboratories: Hygrometry and thermometry |
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CALIBRATION
ACCREDITATION
N°2.21
HYGROMETRY |
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CALIBRATION
ACCREDITATION
N°2.1116
TEMPERATURE |
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CALIBRATION
ACCREDITATION
N°2.57
LIQUID FLOW RATE
MEASUREMENT |
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CALIBRATION
ACCREDITATION
N°2.1160
MANOMETRY |
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Hygrometry & Thermometry
CETIAT is accredited by COFRAC in hygrometry and thermometry
for the on-site calibration. Those accreditations are on-site
extensions of the national reference of the BNM-COFRAC chain
as far as hygrometry is concerned, and of the calibration
and thermometry laboratory for the temperature.
The calibration is performed in the test room of a humid
air generator. The dew point temperature is measured with a reference hygrometer. The dry 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.
For underwater thermometers, the calibration is performed
in a thermostatically controlled bath, by comparison with
a reference platinum resistance thermometer.
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| TYPE OF DEVICE |
FIELD |
ENLARGED UNCERTAINTY |
Dew point
temperature (Td) (Td) |
Dry
temperature |
Relative
humidity (RH) |
| Hygrometer measuring dew point |
-15°C
to
+68°C |
- |
- |
Td ≥ ± 0,16°C |
| Impedance variation hygrometer (capacitive or resistive)
or psychrometer |
0°C to
+70°C |
11% to 95% |
HR
± 0,3% to ±2,1% |
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| Not immerseable probe |
0°C to +70°C |
≥ ±0,21°C |
Industrial Platinum resistance
thermometer |
-30°C
to
+200°C |
≥ ±0,11°C |
| Thermoelectric probe |
≥ ±0,15°C |
| Temperature measurement chain |
≥ ±0,11°C |
| Liquid expansion thermometer |
≥ ±0,14°C |
Liquid flow rate measurement
The calibration is performed by making a comparison between the quantity given by the device under
calibration and the indication given by a transfer reference flow meter (Coriolis mass flow meter).
The stability of the temperature and of the flow pressure is checked throughout the calibration.
| FIELD OF MEASUREMENT |
RELATIVE UNCERTAINTY |
Water and aqueous solutions
Liquids other than water
Temperature : 15 - 50°C
Relative pressure : 1 to 3 bar |
0.01 m3.h-1≤ qv
≤ 36 m3.h-1 |
from ± 7x10-3 to ± 3.3x10-2
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qv : reference volume flow
rate
Manometry
The calibration is performed by making a comparison between the quantity given by the
device under calibration with the indication given by a transfer reference.
| PRESSURE |
FIELD |
ENLARGED UNCERTAINTY |
Relative and differential gas pressure
Line pressure : 1 bar |
-250 to 250 Pa |
±(0.5 Pa + 2.2x10-3xΔP) |
| -2 500 to 2 500 Pa |
±(4.5 Pa + 1.5x10-3xΔP) |
| Gas relative pressure |
0 to +20 kPa |
±(8.5 Pa + 1x10-3xPr) |
| -95 to 200 kPa |
±(20 Pa + 2x10-4xPr) |
| 0 to 7 000 kPa |
±(500 Pa + 7x10-5xPr) |
| Gas absolute pressure |
80 to 120 kPa |
±100 Pa |
| 100 kPa to 7 100 kPa |
±(500 Pa + 7x10-5xP) |
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