Cutting-Fluid Concentration
The running concentration of a coolant sump from a refractometer Brix reading and the fluid's factor, and the concentrate to add (or water to add) to bring it to a target.
Formula and source
Concentration % = Brix x refractometer factor; add concentrate = sump x (target - current) / (100 - target); add water = sump x (current - target) / target.
Metalworking-fluid refractometer method (by name).
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