Krohne’s introduces its new Optiflux electromagnetic flow-meters. The flow-meters are being used by premix concrete manufacturers as part of upgrade programmes to reduce water utility costs and environmental impact. The Optifluxes are being used in batch manufacturing processes which operate 24 hours per day. They measure accurately the amount of recycled water that is added to cement mixing vessels, which flows at rates of between 10 and 20 cubic meters per hour. A signal output from the instrument is fed into a computer system which controls valves on the water feed pipe. The instrument can achieve an accuracy of 0.15% and reproducibility of 0.06%, even when measuring materials with high solid content or that have turbulent flow.