HG/T 3982-2007 "Electrodeionized pure water prepative device" standard specifies the terms and definitions, classification and models, working parameters, required test methods, inspection rules, signs, Encasement and storage and transportation requirements of electrodeionized pure water prepative device (referred to as EDI device). This standard applies to different types of EDI devices with different working parameters using reverse osmosis (RO) treated water (or water of equivalent quality) as influent water. The standard refers to a series of normative documents, including Encasement storage and transportation diagram signs, electrical control equipment, industrial metal pipeline engineering construction and acceptance specifications, etc., to ensure that the design, production and use of EDI devices comply with national standards and technical requirements.