| 摘要 |
A method and analyzer for determining a measured value of a measured variable of process automation technology in a liquid or gaseous medium by means of an optical sensor, which has at least one emitter for sending light of at least two wavelengths, and a receiver associated with the emitter for receiving of received light, comprising the steps as follows: taking a sample of the medium; mixing the sample with one or more reagents; supplying the emitter with an exciter signal for producing the sent light, wherein the sent light by interaction with, especially by absorption by, the mixed sample is converted into received light as a function of the measured variable; producing a receiver signal by means of the receiver from the converted, received light; and determining the measured value based on the receiver signal and a calibration function. The method is characterized in that, in determining the measured value, aging of the reagents is taken into consideration, especially the calibration function includes a term which takes aging of the reagents into consideration. |
