Dew Point Calibration
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 othercarrier gases such as methane are possible upon request. Special calibrations of dew point meters and dew point mirrors are possible in the Designated Institute.
Scope of Accreditation E+E Calibration Laboratory
| Calibration | Calibration object | Measurement conditions | Measurement range1) | Calibration uncertainty | |
|---|---|---|---|---|---|
| NMI | Lab | Special calibration of air velocity measuring instruments in the Designated Institute BEV/E+E | |||
| AA 0608 | Lab | Condensation hygrometer (Dew point mirror) Dew point hygrometer | 10 bar for tf = -60 °C...td = 95 °C (950 ± 150) mbar for tf < -60 °C | (-75 bis <-60) °C (-60 bis <-25) °C (-25 bis 80) °C (<80 bis 95) °C | 0.03 K * (1-(tf + 25 °C) / 55 K) 0.02 K + 0.03 K * (tf + 25 °C) / 55 K) 0.02 K 0.02 K +0.005 K* (tf - 80 °C) / 20 K |
| AA 0608 | Lab | Condensation hygrometer (Dew point mirror) Dew point hygrometer | Pressure range 1...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 |
| AA 0608 | Lab | Humidity generator | Temperature range (25 ±3) °C -80 °C to +95 °C | -80...<-60 °C -60...<-25 °C -25...< 70 °C 70...< 95 °C | 0.07 °C - (60 °C + tf) * 0.012 0.07 °C 0.055 °C 0.065 °C |
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
Calibration Procedure
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.
Calibration Inquiry
Accompanying Slip
For efficient processing of your calibration order, please also send us a fully completed accompanying slip with the measuring device to be checked.
