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为了加快电动单元组合仪表的发展,满足500万吨/年炼油厂等大型成套项目自动化的需要,根据一机部、石化部的指示,DDZ-Ⅲ型仪表从1976年7月10日至12月13日在石化一公司洛阳设计院炼油试验厂进行了现场运行。运行试验工作是由重庆工业自动化仪表研究所、西安仪表厂、北京自动化技术研究所、天津仪表厂、大连仪表厂、北京西城电表厂、南阳电气防爆研究所和石化一公司洛阳设计院炼油试验厂组成的三结合联合试
In order to speed up the development of electric unit instrument cluster and meet the automation needs of large complete sets of projects such as 5 million tons / year oil refineries, according to instructions from a machine department and a petrochemical department, the DDZ-Ⅲ instrument will change from July 10 to December 1976 On the 13th, a petrochemical company Luoyang Design Institute Refinery pilot plant was on-site operation. Operation test work by the Chongqing Institute of Industrial Automation Instrumentation, Xi’an Instrument Factory, Beijing Institute of Automation Technology, Tianjin Instrument Factory, Dalian Instrument Factory, Beijing Xicheng meter factory, Nanyang Institute of Electrical Explosion and Petrochemical Company Luoyang Design Institute Refinery Test Plant Composed of three combined joint trial