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一、引言在石油化学工业中,电动变送器被广泛地用来测量介质的流量、压力、液位等工艺参数。七十年代前,电动变送器的测量原理,主要采用以杠杆组成的位移平衡机构和力平衡矢量式测量原理。始终摆脱不了机械连接、杠杆及支承等,测量精度不易提高。如上海石油化工总厂的一期工程中引进的各装置所选用的电动变送器,以及国内正在成批生产的DDZ—Ⅲ型电动变送器均属此类。随着电子工业的飞速发展,促进了仪表工业的发展。仪表形式的单元化、插件化,仪麦电气的集成
I. Introduction In the petrochemical industry, electric transmitters are widely used to measure media flow, pressure, liquid level and other process parameters. Seventies ago, the measurement principle of electric transmitter, the main use of the composition of the lever displacement balance mechanism and force balance vector measurement principle. Always can not get rid of the mechanical connection, lever and support, measurement accuracy is not easy to improve. Such as the Shanghai Petrochemical Plant in the first phase of the project introduced by the installation of the electric transmitter, as well as the domestic production of DDZ-Ⅲ-type electric transmitter are such. With the rapid development of the electronics industry, it has promoted the development of the instrumentation industry. Instrument form of the unit, plug-in, meter wheat electrical integration