NEW BRUNSWICK SCIENTIFIC BioFlo 415 Manual To Operations page 83

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NOTE:
Regardless of DO (cascaded-from) output, the setpoint of any cascade-
to loop will not go below its own Minimum Setpoint value.
Minimum Output% corresponds to the minimum value that will produce
the minimum setpoint; lower outputs will not affect setpoint.
Regardless of DO output, the setpoint of any cascade-to loop will not
rise above its own maximum setpoint.
New Brunswick Scientific User's Guide