一、概述目前,我国仪表制造行业,在原有的DDZ-Ⅱ型电动单元组合仪表的基础上,发展並完善了 DDZ-Ⅲ型电动单元组合仪表和组装式仪表,并从国外引进了品种繁多的采用国际标准信号的电动单元仪表和组装式仪表。如引进日本横河—北辰电机制作所的Ⅰ系列、EK 系列电动单元仪表,ER 系列,NRE 系列记录仪,DPF 系列变送器; I. Overview At present, China’s instrument manufacturing industry, based on the original DDZ-II electric unit combination meter, has developed and perfected DDZ-III electric unit combination meter and assembled meter, and introduced a large variety of Electric unit with international standard signal and assembled meter. Such as the introduction of Japan’s Yokogawa - Beichen Motor Manufacturing Ⅰ series, EK series of electric unit meters, ER series, NRE series recorders, DPF series of transmitters;