Procedure to calibrate a temperature sensor located in an automation technology process, characterized in that the calibration procedure comprises the following steps: Specification of a temperature measurement range (ΔT) which is passed through recurrently in the automation technology process; Specification of a reference temperature ( T ref ) that occurs in the temperature measurement range (ΔT); Specification of a time interval (Δt) during which the temperature measured values (T) in the temperature measurement range (ΔT) should be at least approximately constant; wherein at least one parameter is determined for the calibration of the temperature sensor - said parameter being the temperature measurement range (ΔT), the reference temperature (T ref ) or the time interval (Δt) - from the process using the temperature sensor to be calibrated, in that - following the installation of the temperature sensor - the process temperature is measured over a period of time comprising several cycles of the process, wherein the procedure comprises the following additional process steps: Determination of the current temperature measured values (T) using the temperature sensor ; Detection of whether the temperature measured values (T) in the temperature measurement range (ΔT) are at least approximately constant during the predefined time interval (Δt); Correction of the current temperature measured value (T) to the predefined reference temperature ( T ref ), wherein the correction step only takes place if the detection step has detected that the current temperature measured values (T), located in the temperature measurement range (ΔT), are at least approximately constant during the predefined time interval (Δt). Specification of a temperature measurement range (ΔT) which is passed through recurrently in the automation technology process; Specification of a reference temperature ( T ref ) that occurs in the temperature measurement range (ΔT); Specification of a time interval (Δt) during which the temperature measured values (T) in the temperature measurement range (ΔT) should be at least approximately constant; wherein at least one parameter is determined for the calibration of the temperature sensor - said parameter being the temperature measurement range (ΔT), the reference temperature (T ref ) or the time interval (Δt) - from the process using the temperature sensor to be calibrated, in that - following the installation of the temperature sensor - the process temperature is measured over a period of time comprising several cycles of the process, wherein the procedure comprises the following additional process steps: Determination of the current temperature measured values (T) using the temperature sensor ; Detection of whether the temperature measured values (T) in the temperature measurement range (ΔT) are at least approximately constant during the predefined time interval (Δt); Correction of the current temperature measured value (T) to the predefined reference temperature ( T ref ), wherein the correction step only takes place if the detection step has detected that the current temperature measured values (T), located in the temperature measurement range (ΔT), are at least approximately constant during the predefined time interval (Δt). Determination of the current temperature measured values (T) using the temperature sensor ; Detection of whether the temperature measured values (T) in the temperature measurement range (ΔT) are at least approximately constant during the predefined time interval (Δt); Correction of the current temperature measured value (T) to the predefined reference temperature ( T ref ), wherein the correction step only takes place if the detection step has detected that the current temperature measured values (T), located in the temperature measurement range (ΔT), are at least approximately constant during the predefined time interval (Δt). <EOS>