The multi-parameter controller mx- CONTROL 8620 is designed to automate the control of process variables within a water treatment system and thereby reduces controller and instrument costs by as much as half. The 8620 integrates all control, monitoring and display features as well as data and event logging functions into one compact, easy to configure controller. This saves time and space in cooling towers, reverse osmosis applications and boiler systems by allowing parameterization of a wide number of control variants via the integrated SD card slot, USP or connection via Ethernet. With an eye on both process safety and ease of use, the unit fits into a concept which can easily be customized exactly to any requirements and applications. It is the first modular control system designed for seamless integration into countless chemical or skid control applications. It is one versatile controller that can easily be configured to display various measurements.