The Proteus range of optical instruments represents a step change in real-time monitoring of natural and engineered waters. The state of the art monitoring platform incorporates the latest optical technology to provide accurate, reliable and maintenance free monitoring of Biochemical Oxygen Demand (BOD), Dissolved Organic Carbon (DOC), Total Organic Carbon (TOC), Chemical Oxygen Demand (COD) and Total Coliform counts. All parameters can be measured in real-time and logged on the device or streamed to other systems for process control or alarms/alerts. The robust design and automated cleaning mechanism make the Proteus sensor range suitable for on-line monitoring applications in the most demanding environments. While the medium sensor size (diameter = 88 mm) makes it suitable for submersible in-channel installation, bankside flow cell setup and mobile spot measurements.