Selection of flow meters

A mass flow meter or an electromagnetic flow meter can be used to address the issue caused by gases. These two types of flowmeters are not sensitive to the effects of gas, enabling more accurate measurement results. .

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If the fluctuations are large, then the bubble content must be high, right? In the case of a single-phase flow, such as the measurement of the flow rate of canola oil, there are many available flow meters: velocity-type flow meters such as turbines, vortex flow meters, and ultrasonic flow meters can all be used; since canola oil is non-conductive, electromagnetic flow meters are not suitable ； Then there are the Coriolis mass flowmeters, which measure mass flow directly ； If the gas content is very high, it is essentially a two-phase flow ； For volume flowmeters, the principle is to measure the flow velocity in some way and then multiply it by the cross-sectional area; however, the measurement will definitely be inaccurate in the presence of gas ； For mass flow meters, when the gas content is not high, some manufacturers can enable algorithmic compensation, which may yield slightly better results compared to volume flow meters; moreover, the density value output can also serve as an auxiliary indicator. Ultimately, it still depends on the gas content – if it is too high, it is best to install the flow meter in an environment with minimal mixed gases. Secondly, the weighing method could also be considered

You actually suggest using an electromagnetic flowmeter to measure rapeseed oil? You’re really a disaster when it comes to appearance

The rapeseed oil was measured, and it still contained bubbles; it is likely that this measurement was taken in the oil-extraction workshop of an oil processing plant, where accuracy requirements are not high. Rapeseed oil has a relatively high viscosity, and its viscosity is significantly affected by temperature. If it is not possible to maintain a stable temperature for the oil extracted, using a vortex flow meter is not appropriate; in such cases, a metal rotor flow meter is recommended. As for bubbles in the pipeline, try to eliminate them by installing a degassing device or vent valve at an appropriate location upstream of the flow meter. For more accurate measurement, it is recommended to use a volumetric flow meter.