Create a recirculating pipe system that has two different pipe sizes.
Many different standards exist for pipe sizes, and their prevalence varies depending on industry and geographical area.
Turbine meters are generally available for 1-1/2" to 12" or higher pipe sizes.
Just crank up the velocity or shrink the pipe size.
It is not clear how the change between the two pipe sizes would have been achieved unless the piston carriages were changed at Newton.
Smaller package on the larger pipe sizes.
It is proportional to flow rate, but does not depend on pipe size.
You need a different spring for each pipe size you're working with.
Many standard pipe sizes have known speeds of sound which can be used for the calculation.
These pipe sizes are directly related to the proportion of liquid flows through the unit.