在“七五”、“八五”期间，我国有一百多个年产四万吨尿素装置上马。这些装置在国民经济建设中产生了巨大的效益，其仪表自控装置使当时小化肥自控水平上了一个新台阶。经过这些年的实际生产应用，也暴露出某些方面的不足，现对其提出一些改进意见。在流量测控方面，对高... During the “Seventh Five-Year Plan” and the “Eighth Five-Year Plan” period, over one hundred plants with an annual output of 40,000 tons of urea were launched in our country. These devices have brought tremendous benefits in the construction of the national economy, and their instrumentation and control devices have made the level of automatic control of small-scale fertilizers at the time a new level. After these years of actual production and application, but also exposed some of the deficiencies, is now making some suggestions for improvement. In the flow measurement and control, the high ...