A sensor system (1; 1'; 1") for determining a flow rate of a fluid flow (6; 7) within a fluid channel (2; 2'; 2"), with the fluid channel (2; 2'; 2"), preferably in the form of a fluid tube, the fluid channel (2; 2'; 2") comprising an elastic segment (22, 22', 22") arranged next to at least one rigid segment (21, 23), at least a first pair of electrodes (31, 32), the electrodes (31, 32) of the first pair of electrodes (31, 32) being arranged opposing each other, at least a second pair (4; 4'; 4") of electrodes (41, 42; 41', 42'; 41", 42") provided at said elastic segment (22, 22', 22") of the fluid channel (2; 2'; 2"), with the electrodes (41, 42; 41', 42'; 41", 42") of the second pair (4; 4'; 4") of electrodes (41, 42; 41', 42'; 41", 42") being arranged opposing each other, and a sensor unit for detecting a capacitance of the first pair of electrodes (31, 32) and the second pair (4; 4'; 4") of electrodes (41, 42; 41', 42'; 41", 42"), characterized in that said first pair of electrodes (31, 32) is provided at said rigid segment of the fluid channel (2; 2'; 2"), with the first pair of electrodes (31, 32) being in contact with said rigid segment of the fluid channel (2; 2'; 2"), and wherein the second pair (4; 4'; 4") of electrodes (41, 42; 41', 42'; 41 ", 42") is in contact with said elastic segment (22, 22', 22") of the fluid channel (2; 2'; 2"), and the sensor system (1; 1'; 1") further comprises a processing unit for calculating and monitoring a distance (d 2nd; d' 2nd; d" 2nd) between the electrodes (41, 42; 41', 42'; 41", 42") of the second pair (4; 4'; 4") of electrodes (41, 42; 41', 42'; 41", 42") based on the detected capacitance of the first pair of electrodes (31, 32) and the second pair (4; 4'; 4") of electrodes (41, 42; 41', 42'; 41", 42"). at least a first pair of electrodes (31, 32), the electrodes (31, 32) of the first pair of electrodes (31, 32) being arranged opposing each other, at least a second pair (4; 4'; 4") of electrodes (41, 42; 41', 42'; 41", 42") provided at said elastic segment (22, 22', 22") of the fluid channel (2; 2'; 2"), with the electrodes (41, 42; 41', 42'; 41", 42") of the second pair (4; 4'; 4") of electrodes (41, 42; 41', 42'; 41", 42") being arranged opposing each other, and a sensor unit for detecting a capacitance of the first pair of electrodes (31, 32) and the second pair (4; 4'; 4") of electrodes (41, 42; 41', 42'; 41", 42"), characterized in that said first pair of electrodes (31, 32) is provided at said rigid segment of the fluid channel (2; 2'; 2"), with the first pair of electrodes (31, 32) being in contact with said rigid segment of the fluid channel (2; 2'; 2"), and wherein the second pair (4; 4'; 4") of electrodes (41, 42; 41', 42'; 41 ", 42") is in contact with said elastic segment (22, 22', 22") of the fluid channel (2; 2'; 2"), and the sensor system (1; 1'; 1") further comprises a processing unit for calculating and monitoring a distance (d 2nd; d' 2nd; d" 2nd) between the electrodes (41, 42; 41', 42'; 41", 42") of the second pair (4; 4'; 4") of electrodes (41, 42; 41', 42'; 41", 42") based on the detected capacitance of the first pair of electrodes (31, 32) and the second pair (4; 4'; 4") of electrodes (41, 42; 41', 42'; 41", 42").