Patent ID: 7916294

Claim:
A system for determining a cloud point or a clear point of a substance in a solvent system, the system comprising: a holder to hold a sample comprising an amount of the substance and an amount of the solvent system, a temperature conditioner to alter the temperature of the sample, an optical measurement device to measure an optical parameter of the sample, and a control device to control at least the temperature conditioner and the optical measurement device, the control device being programmed to: a) alter the temperature of the sample by the temperature conditioner; b) measure the optical parameter of the sample by the optical measurement device; and c) determine the cloud point or clear point of the substance from a change of the optical parameter of the sample as a function of the temperature; wherein c) comprises: smoothing measured optical parameter data; differentiating the smoothed measured optical parameter data; detecting peaks in the differentiated, smoothed, measured optical parameter data, and associating positive peaks with candidate clear point transitions and negative peaks with candidate cloud point transitions.