A sensor device for detecting at least one analyte in a body fluid of a user, the sensor device comprising at least one evaluation device configured for evaluating a data stream of time-dependent concentrations c of the analyte, wherein the evaluation device comprises at least one comparator device configured for comparing a current value c(t) of the concentration c with at least one first threshold value L and with at least one second threshold value H, with H > L, wherein the evaluation device is further configured to define a tolerance time interval, wherein the evaluation device, by using the comparator device, is configured to detect if the concentration c rises and exceeds the first threshold value L during the tolerance time interval and to prepare a warning signal W accordingly, wherein the evaluation device is configured to suppress an output of the warning signal W at least until the tolerance time interval expires, under the precondition that c(t) < H during the tolerance time interval, wherein the evaluation device is configured to output the warning signal W if the concentration c exceeds the first threshold value L after the tolerance time interval expires and if the current value c(t) of the concentration c is below the second threshold value H during the tolerance time interval and wherein the evaluation device is further configured to output the warning signal W, if the concentration c exceeds H at any time, wherein the evaluation device comprises an electronic component, wherein the electronic component is configured for one or more of performing a measurement with a sensor, performing a voltage measurement, performing a current measurement, recording sensor signals, storing measurement signals or measurement data, transmitting sensor signals or measurement data to another device, characterized in that the evaluation device further is configured to recognize at least one point of time t 1 at which an event known to have an effect lowering the concentration c of the analyte occurs, that the evaluation device, by using the comparator device, is configured to detect if the concentration c exceeds the second threshold value H during the tolerance time interval and to prepare a high level warning signal WH accordingly, and that the evaluation device is configured to define a high level offset time interval starting at t 1, wherein the evaluation device is configured to suppress an output of the high level warning signal WH at least until the high level offset time interval is expired. wherein the evaluation device comprises an electronic component, wherein the electronic component is configured for one or more of performing a measurement with a sensor, performing a voltage measurement, performing a current measurement, recording sensor signals, storing measurement signals or measurement data, transmitting sensor signals or measurement data to another device, characterized in that the evaluation device further is configured to recognize at least one point of time t 1 at which an event known to have an effect lowering the concentration c of the analyte occurs, that the evaluation device, by using the comparator device, is configured to detect if the concentration c exceeds the second threshold value H during the tolerance time interval and to prepare a high level warning signal WH accordingly, and that the evaluation device is configured to define a high level offset time interval starting at t 1, wherein the evaluation device is configured to suppress an output of the high level warning signal WH at least until the high level offset time interval is expired.