The measurement cycle of photometric analyzers includes several phases.
Initially, the sample enters the measurement cell to be washed and started. Next, the first measurement is taken to calibrate the system (photometric zero).
After that, the specific reagent for measuring the desired parameter is added. The reaction between the reagent and the target substance occurs by stirring the sample.
Subsequently, the developed color is read, which corresponds to the light absorbance of the sample.
This differential measurement between the obtained absorbance value and the reference absorbance value (photometric zero) is processed and converted into a concentration value using specific correlation tables.