The WTW IQ Sensor Net from the Xylem Analytic group has for many years set the standard for online measuring technology. It is suitable for conventional instrumentation with analog outputs as well as for field bus Instrumentation. The innovative digital sensors in this system represent the state of the art in process measuring. A new controller family MIQ/MC3 with integrated USB and LAN interfaces opens the IQ Sensor Net System to the future-proof world of internet communication via TCP/IP and Profinet technology. The new spectral UV-VIS sensors CarboVis®, NirtaVis® and NiCaVis® allow for chemical-free measurements of COD, TOC, BOD, NO3, and TS directly in the wastewater process. Their new optical design, integrated ultrasonic cleaning system and high-tech materials Titanium and PEEK assure high measurement reliability, simple handling, and extreme durability.