Method to parameterize a device for determining and/or monitoring a definable fill level, comprising at least one sensor unit and electronics , with the following method steps: Determination of at least one influence interval (ΔE(U)) for a reception signal (E) received by the sensor unit based on at least one ambient parameter (U), wherein the influence interval (ΔE(U)) extends over a predefined value range for the respective ambient parameter and describes a variation of the reception signal (E) based on the ambient parameter (U), Determination of a first value (E 1 ) for the reception signal (E) or a variable derived from the reception signal (E) corresponding to a first switching state (S 1 ), for whose value the sensor unit is in a first state, determination of a second value (E 2 ) for the reception signal (E), or a variable derived from the reception signal (E) corresponding to a second switching state (S 2 ), for whose value the sensor unit is in a second state, and determination of at least one third value (E 3 ) for the reception signal (E) or a variable derived from the reception signal (E) corresponding to a first switching point (P 1 ) based on the first (S 1 ) and/or second switching state (S 2 ) and taking into account the at least one influence interval (ΔE(U)), wherein based on the at least one influence interval (ΔE(U)) a first value range (ΔE 1 ) for the reception signal (E) or the variable derived from the reception signal (E) is determined, wherein the first value range (ΔE 1 ) contains the first value (E 1 ) of the reception signal (E) or the variable derived from the reception signal (E), wherein the first value range (ΔE 1 ) corresponds to the first switching state (S 1 ) and wherein the first switching point (P 1 ) is selected in such a way that the third value (E 3 ) for the reception signal (E) or the variable derived from the reception signal (E) is outside the first value range (ΔE 1 ) corresponding to the first switching state (S 1 ). Determination of at least one influence interval (ΔE(U)) for a reception signal (E) received by the sensor unit based on at least one ambient parameter (U), wherein the influence interval (ΔE(U)) extends over a predefined value range for the respective ambient parameter and describes a variation of the reception signal (E) based on the ambient parameter (U), Determination of a first value (E 1 ) for the reception signal (E) or a variable derived from the reception signal (E) corresponding to a first switching state (S 1 ), for whose value the sensor unit is in a first state, determination of a second value (E 2 ) for the reception signal (E), or a variable derived from the reception signal (E) corresponding to a second switching state (S 2 ), for whose value the sensor unit is in a second state, and determination of at least one third value (E 3 ) for the reception signal (E) or a variable derived from the reception signal (E) corresponding to a first switching point (P 1 ) based on the first (S 1 ) and/or second switching state (S 2 ) and taking into account the at least one influence interval (ΔE(U)), wherein based on the at least one influence interval (ΔE(U)) a first value range (ΔE 1 ) for the reception signal (E) or the variable derived from the reception signal (E) is determined, wherein the first value range (ΔE 1 ) contains the first value (E 1 ) of the reception signal (E) or the variable derived from the reception signal (E), wherein the first value range (ΔE 1 ) corresponds to the first switching state (S 1 ) and wherein the first switching point (P 1 ) is selected in such a way that the third value (E 3 ) for the reception signal (E) or the variable derived from the reception signal (E) is outside the first value range (ΔE 1 ) corresponding to the first switching state (S 1 ). <EOS>