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See Chinese contents: CJ/T 224-2012 CJ/T 224-2012: Electronic remote-reading water meter
This standard stipulates the electronic remote-reading water-meter terms and definitions, structure and classification, metrological requirements, technical requirements, test method, inspection rules and mark, packaging, transportation, and storage. This standard is applicable to water-meters that have digital output signal and comply with relevant provisions of GB/T 778.1-2007 and GB/T 778.3-2007.
