Process photometry has many applications in breweries. Besides the actual production of beer, for which Sigrist did pioneering work with precision turbidity measurement for filter monitoring, these include
Depending on the quality of the available raw water, treatment of the brewing water may employ the same techniques as potable water treatment: flocculation, sand filtration, ozone sterilization, activated charcoal filtration.
In the actual production process, the main application is measurement of turbidity levels for the purpose of monitoring beer filtration. Dual-angle measurement, i.e. the detection of the scattered light intensity at two different angles, is used to distinguish particle sizes. Other measuring points are used to check the wort lautering, the yeast addition, and the color.
A special laboratory version of the Sigrist turbidimeter is used for measuring individual samples in the measuring cell or in filled beer bottles. It is equipped with an automatic rotation device and an electronic evaluation system for eliminating the effect of any optical irregularities in the bottle glass. Use of a water bath eliminates problems of condensation when measuring cold samples.
In wastewater treatment, turbidity measurement is used before and after the physical and biological treatment steps. It monitors the solids concentration in the raw wastewater and the turbidity of the effluent before it is released to the sewer.