The E+E accredited dew point calibrations impress with a very low measurement uncertainty and a range from -90 °C (-130 °F) frost point to +95 °C (203 °F) dew point.
Standard calibrations are performed in nitrogen. Calibrations of dew point hygrometers in other carrier gases such as methane are possible upon request. Special calibrations of dew point meters and dew point mirrors are possible in the designated NMI laboratory.
Calibration | Calibration object | Measurement conditions | Measurement range1) | Measurement uncertainty | |
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AA 0608 | Lab | Dew point hygrometer Dew point transmitter | Gas flow max. 5 l/min Air pressure max. 10 bar for Td (-64.6...95) °C 950 mbar ± 150 mbar for Td <-64.6 °C | (-75...<-55) °C (-55...<-22.5) °C (-22.5...70) °C (>70...95) °C | 0.05-(55+Tf)*0.01 K 0.05 K 0.035 K 0.045 K |
AA 0608 | Lab | Dew point transmitter | Pressure range 1 to 100 bar Air or nitrogen2) | (-90...<-80) °C (-80...<-55) °C (-55...<-25) °C (-25...20) °C | 0.2-(80+Tf)*0.02 K 0.05-(55+Tf)*0.006 K 0.05 K 0.035 K |
1) According to the BIPM Service category 3.1, "dew point" is used as denomination for the measurand. For values <0 °C the value refers to frost point. Calibration for values <0 °C can also be carried out for the calculated dew point temperature.
2) Other gases, such as methane, upon request
In a dual pressure humidity generator, air is generated with a defined mole fraction (water/gas) with a maximum gas flow of 5 l/min under normal conditions (displayed). This gas flow is conveyed to the test sample and at the sample location, generates a defined dew point temperature depending on the pressure. As an option, the test sample can be temperaturestabilised in a measurement chamber. The calibration system is the Austrian national standard for air humidity.
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Brochure Calibrationservice1437.75 kb |
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Accompanyslip AA0608 Calibrationservice32.4 kb |
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