Method for determining at least one physical, chemical and/or biological measured variable by means of optical sensors, and turbidity sensor

A method for determining at least one physical, chemical and/or biological measured variable of process automation in a medium by means of at least one optical sensor, especially taking into consideration wall effects as a function of environmental conditions at the location of installation of the sensor, comprising the steps of:

• sending transmission signals into the medium, wherein the transmission signals are converted into received signals by interaction with, especially by scattering from, the medium as a function of the measured variable;
• receiving the received signals;
• and
• converting the received signals into the measured variable as a function of environmental conditions at the location of installation;
• and
• adjusting the sensor based on a calibration graph corresponding to environmental conditions at the location of installation.