METHOD AND DEVICE FOR ANALYZING EFFLUENTS FOR THE DETECTION OF PEAKS

摘要

The output signal of an effluent detector, arranged for example after a liquid phase chromatography column is digitized and compared to a LEVEL signal fixed with respect to the base line of the detected signal, increased by a deviation value (LO). A slope threshold is defined. As long as the slope of the detected signal is lower than the threshold, the pilot signal follows the detected signal. When the slope of the detected signal is higher than the threshold, a peak has occured, and the value of the pilot signal is locked, at least during a preset time. Thereafter, the pilot signal resumes its evolution substantially in parallel to the base line. Thereby, an excellent detection of the useful peaks in analyzing effluents is obtained.