A liquid flow standard system has been used to calibrate liquid volume at a specific flow rate. However, liquid flow rate has not been considered as a calibration item due to lack of flow diversion mechanism. To enable the liquid flow rate calibration service, uncertainty due to flow diversion was estimated. Diversion timing error as well as temperature dependence on the flow rate was considered. Uncertainty contributions by the two factors were largest more than 40 % of the total uncertainty. On the while, the uncertainty contributions due to other factors were less than 5 %.

Due to their long term stability, well understood flow behaviour and very low uncertainty, standard critical flow Venturi nozzles (CFVN) are enjoying great popularity as a calibration tool and flow metering device. Their application to very small flow rates beyond the ISO 9300 Standard, however, leaves many questions unanswered. The present work aimed at detailed description of flow fields within CFVNs of diameters between 15 µm and 80 µm. The present numerical flow simulations were validated by corresponding experimental work.

The feasibility of Lorentz Force Velocimetry for flow measurement of poorly conducting electrolytes is demonstrated using experimental results on salt water flow exposed to a permanent magnet system. The results provide a linear relationship between the measured Lorentz force and flow velocity, consistent with the theoretical scaling laws. Further measurements are currently being performed on a new experimental setup. The new experiments are aimed at investigating the effect of flow dynamics on the measured force.

In the present investigation, the problem of accurate determination of volumetric flows by means of vortex-shedding flow meters in the case of upstream disturbances produced by bends has been studied. To this end, the corresponding flow field was investigated experimentally and by detailed numerical simulation for the case of incompressible fluid flow (water). The computations were carried out for a limited number of cases using the three-dimensional unsteady incompressible solver of the Navier-Stokes equations as included in the adapco Star CCM+ commercial program.. The effects of turbulence were modelled using the realizable k-e turbulence model. The resulting flow fields were studied in detail using various visualization methods. The effect of the disturbances was investigated for 3 different orientations of the basic meter relative to the bend. The effect of each of the cases was assessed by comparison with the undisturbed inflow into the meter. The resulting knowledge of the flow field in a vortex flow meter is highly useful not only for the understanding of the meters response to upstream disturbances, but it also offers a valuable tool for future developments.

The dynamic method of generating reference Volatile Organic Compounds (VOC) mixtures at trace level requires the uninterrupted blending of the component flows. The accurate control of the dilution air flows can be realized by Mass Flow Controllers (MFC). Accuracy and stability of MFC are here measured and discussed in order to verify their use in dynamic gas dilutors. Long term stability confirm the necessity of calibrating MFC before each use. MFC accuracy results not pressure drop dependent, but limited by the short term stability for flows below than 70% of MFC full scale and generation time shorter than 5 minutes.