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 turbidity in a medium by means of at least one optical sensor, by 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 scattering with, the medium as a function of the turbidity;
• receiving the received signals;
• and
• converting the received signals into turbidity by taking into consideration wall effects as a function of environmental conditions at the location of installation,
• wherein the environmental conditions comprise at least different materials, different diameters of a calibration containment, or different distances of the optical sensor to a calibration containment;
• and
• adjusting the sensor based on a calibration graph corresponding to environmental conditions at the location of installation,
• wherein the calibration graph is recorded before the actual installation at the location of installation.