New primary low-range dew-point generator at LPM

This paper describes the new primary low-range dew-point generator at LPM developed in cooperation with MIKES through EUROMET project no. 912. The generator is designed for primary realisation of the dew-point temperature scale from -70 °C to +5 °C. The principle and the design of the generator are described in detail and schematically depicted. Results of the preliminary efficiency tests of it's saturator show that it is efficient enough for a primary realisation of the dew-point temperature scale. Standard uncertainties due to the non-ideal saturation efficiency are estimated to be 0.02 °C.