A method for accurately performing concentration measurements while compensating the dilution ratio as needed during continuous measurement of specified ingredient in the liquid to be tested. The liquid to be tested is diluted by a diluent, wherein the liquid to be tested and the diluent or the mixture...http://www.google.com/patents/US4585007?utm_source=gb-gplus-sharePatent US4585007 - Method for continuously measuring a specified ingredient in a diluted liquid
