Flow sensor impact on flow

Other Hardware Sensors
4

you can also split your pipe in a big and a small pipe and measure the speed in the small pipe.
it would affect the main flow at max to the ratio of the diameters of the pipes.
If the small pipe is 1/100 of the diameter of the big one a complete stop would have 1% impact. If it still flows it would affect less.

Problems you need to solve with this solution:

  1. you must callibrate the readings with the real flow (l;ookup table)
  2. the small flow can be too small to be readable (but then you can use a smaller flowmeter (e.g. centiliter iso liter)
  3. the spilt and merge of the flow can/will cause turbulence which might influence the system
  4. depending on the viscosity, and the purity of the liquid (is it water, oil, slurry etc) side effect may happen..