A rotating separator has a housing preventing separated liquid carryover. The device includes a hot gas generator having a gas burner whose combustion products pass into a mixing device via at least one supply opening. In the data supplying method, data of a predetermined number of bits is supplied to the motion estimator. In one application, the use of an organocatalyst with a boiling point significantly lower than the boiling point of the reactant alcohol allows for the ready recycling of the amine organocatalyst. Thus, devices according to the invention allow for continuous potentiometric pH measurements with occasional spectrophotometric calibrations.