Wastewater sensor goes non-contact

摘要

The search for reliable wastewater instrumentation data has gone down many roads: compressed air blasts, water jets, wipers, multiple beams, biocide washes, dual/ triple sensors, even frequent manual cleaning as a last resort. We have learned, largely by trial and error, which methods work best with which sensors, and where in the process they are effective. There is now a much greater need for highly reliable instrumentation, driven by the installation of new control systems. Companies are investing £50-150K per plant on advanced process control to achieve energy savings, but the promised returns are much less attractive if the system has only 60% or 70% up time due to instrument fouling.