Watson-Marlow Fluid Technology Group
A metering pump optimized for NaClO applications
The new Qdos 20 pump (photo) has been developed to offer highly accurate sodium hypochlorite metering in disinfection applications with flowrates up to 32 gal/h at a maximum of 100 psi pressure. It is especially suitable for applications at the well sites of many smaller water treatment plants, where operators are often injecting into water lines at higher pressure. The new model is designed as a drop-in replacement for diaphragm pumps. Its intuitive interface provides simple control of the pump via manual, 4–20-mA, contact or Profibus control. The brushless, d.c.-motor control maintains flow accuracy of±1% with a repeatability of±0.5% and a turndown ratio of 3,330:1. — Watson-Marlow Fluid Technology Group, Falmouth, Cornwall, U.K.