Electro-Chemical Devices, Inc. (ECD) is a recognized leader in industrial process control instrumentation: transmitters, controllers, analyzers, sensors and electrodes. ECD's products measure pH; conductivity; resistivity; oxidation reduction potential (ORP, REDOX); dissolved oxygen (DO) (optical and amperometric); turbidity; free residual chlorine; total chlorine; and ion selective electrodes (pION) for ammonium, bromide, cadmium, calcium, chloride, copper, cyanide, fluoride, nitrate, potassium, sodium and sulfide. ECD produces colorimetric analyzers for aluminum, ammonia, chlorine, chloride, chromium VI, copper, cyanide, hardness, iron, manganese, nickel, nitrate, nitrite, total nitrogen, phosphate, total phosphate, silica, sulfate, sulfide and zinc. ECD also offers control systems for boiler blow down and cooling towers.