METHOD FOR ONLINE DETERMINATION OF A BASE NUMBER OF A LIQUID BODY AND USE OF THIS METHOD FOR A LUBRICANT

摘要

A method for determining a basicity index of a liquid body comprising: (a) detecting an intensity of an infrared signal passing through a sample of the liquid body; (b) calculating a transmittance value of infrared waves through the sample for p wave numbers, wherein p in a natural integer greater than or equal to two; and (c) determining the basicity index of the liquid body, BN, wherein of BN=Tr·M(p×1)+R, Tr is a set of transmittance values calculated in step b, M(p×1) is a set of data of a model, the set of data containing coefficients determined from measured basicity index values and measured transmittance values of reference liquid bodies, and R is a residue of the model, determined from the measured basicity index values and the measured transmittance values of the reference liquid bodies.