This thesis presents the development of a temperature-stable housing for a laminar differential flow meter. The aim was to provide a stable thermal environment for the flow meter integrated into the primary humidity generator system. This would enable reliable and repeatable measurement of nitrogen flow at elevated temperatures.
The theoretical background of flow measurement is presented first, including the influence of different flow regimes and parameters on measurement accuracy, as well as the process of selecting a suitable flow meter. The chosen device was the Alicat Whisper MW model, adapted for operation at high temperatures and low pressure drop.
The practical part of the thesis covers the design, modelling, and manufacturing of the housing using 3D printing. It also includes the selection and integration of heating elements, a fan, a temperature control system, and safety systems. Through adjustments and testing of various prototypes, using different insulation materials and control regimes, the final design was developed.
The conclusions confirm that the designed housing effectively maintains a stable temperature with minimal fluctuations, while final tests demonstrated that the sensor operates reliably and repeatably in such an environment, making the solution ready for integration into the primary humidity generator system.
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