The use of rotameters
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As shown in the figure, the flow meter is used to measure the water injection flow rate. When it displays 5 cubic meters per hour, what is the actual flow rate? How to convert?
The actual flow rate is obtained by multiplying the ratio of the density of the actual fluid to the density indicated on the flow meter by 5 cubic meters per hour.
It measures volumetric flow rate – what is the relationship with density?
Fluids have different densities; therefore, the mass of a fluid varies depending on its volume. For meaningful comparison, it is necessary to consider fluids with the same volume, which leads to the need for adjustments for temperature and pressure – in other words, adjustments for density. If the density does not change with variations in temperature and pressure, then no such adjustments are required.