Method for monitoring at least one parameter of quality of yarn and/or parameters of sensor by electronic yarn cleaner

The invention relates to a method for monitoring at least one parameter of the quality of yarn (2) and/or the parameters of a sensor (4) by an electronic cleaner (1) of yarn by means of an optical detector (5) comprising a sensor (4) with one or two rows of individual optical elements (41, 42) of a rectangular shape, whereby the individual optical elements (41, 42) provide at their outputs an analog signal proportional to the intensity of its irradiation, the value of which is monitored during each measurement cycle. In the first and/or the second row of optical elements (41, 42) of the sensor (4) for each monitored parameter of the quality of yarn (2) and/or for each monitored parameter of the sensor (4) individual optical elements 41,42) of the sensor (4) are selected constituting an active zone for monitoring a particular parameter, whereby the number of the optical elements (41, 42) in one active zone in one row is lower than the overall number of the optical elements (41, 42) in the corresponding row, and the output analog signal of the individual optical elements of the corresponding active zone is included in the evaluation of the particular parameter.