Walchem
A controller for wastewater-treatment applications
Introduced last year, the W900 Series Controller (photo) enables powerful programming for complete control of chemical metering pumps and valves in a broad range of water-treatment applications. With easy, icon-based programming on the large touchscreen display, the W900 can be configured to control multiple outputs using one of many pre-engineered algorithms. Four I/O slots permit exceptional flexibility to utilize almost any type of sensor, including pH/ORP (oxidation-reduction potential), conductivity, disinfection, fluorescence, temperature, level and flow, to name a few. Internet connectivity lets users maintain control via remote access. — Walchem, Iwali America Inc., Holliston, Mass.