Q. The ratio of the full scale flow to the minimum flow that can be measured within the stated accuracy of a flow measuring device is known as:

A
Rangeability
B
Turn-Down
C
Precision
D
Selectivity
Solution:

Turn Down or Turn down Ration describes the range of flow rates between maximum and minimum flow over which a flow meter will work satisfactorily within the accuracy limits and repeatability of tolerances specified by the manufacturer.
Flow meter Turn Down = Maximum Flow/Minimum Flow.

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