by adding a material to be mixed to a mixture in response to a detected feature, e.g. density, radioactivity, consumed power or colour

Full Title

Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application > Forming a predetermined ratio of the substances to be mixed (controlling ratio of two or more flows of fluid or fluent material G05D11/02) > by adding a material to be mixed to a mixture in response to a detected feature, e.g. density, radioactivity, consumed power or colour