Nephelometric turbidimeter and method for detection of the contamination of a sample cuvette of a nephelometric turbidimeter

A nephelometric turbidimeter for measuring a turbidity of a liquid sample in a sample cuvette, the nephelometric turbidimeter comprising:

• a measurement light source configured to emit an axial parallel light beam directed to the sample cuvette;
• a scattering light detector arranged to receive a scattered light from the sample cuvette;
• a diffuser comprising a diffuser body and a diffuser actuator, the diffuser actuator being configured to move the diffuser body between a parking position in which the diffuser body does not interfere with the axial parallel light beam and a test position where the diffuser body is arranged between the measurement light source and the sample cuvette so that the diffuser body interferes with the axial parallel light beam and generates a diffuse test light entering the sample cuvette;
• and
• a cleaning device,
• wherein,
• the sample cuvette is cylindrical and comprises a cylinder wall and a plane bottom wall, and
• the cleaning device is arranged above the cuvette and is configured to mechanically clean the cylinder wall and the plane bottom wall of the sample cuvette.