Compact and low-cost flow switches are available, which cover low to medium flow. The alarm can be tripped with the reed switch, and trip points are user-selectable.
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Flow control valve
Flow controller
Manifold
Vortex flow meter
Turbine / Paddle wheel flow meter
Differential pressure flow meter
Bypass flow meter
Variable-area flow meter
Flow switch
Sight flow
Electromagnetic flow meter
Coriolis flow meter