The compact, space-saving DCM-20 is used in process industries to monitor liquid concentrations, which are determined via an optical method. The design of the robust housing with its cooling fins follows the objective of protecting the optical and electronic elements of the device and keeping them cool. The electrical connectors are additionally protected by a recess. The easy-to-clean, stainless-steel surface serves to prevent product contamination. A simple, integrated user interface rounds off the concept.