Turbidity is commonly used to estimate the concentration of a cell suspension, especially in microbiology. The Dencytee sensor provides online measurement of the turbidity of a microbial or cell suspension, based on optical density. This measurement correlates with the total cell density in a bioprocess. The sensor emits light through a 5 mm window onto a light detector.

The measurement is made at NIR (near infra-red) wavelengths so it is insensitive to changes in media color. All particles that scatter light at 880 nm will be detected, including living and dead cells.

As a unique feature the Dencytee sensor increases the light intensity as turbidity rises. Therefore the light intensity is constant at the detector, leading to a wide measuring range.