描述
FOXBORO-FBM230
70年代中期以前的发展
20世纪,自动化科学技术的建立以及工业的发展,逐渐形成了自动化仪表工业。50年代以前,PID调节已很流行,但集检测、调节、执行功能于一体的基地式仪表仍为主流热工仪表。功能分离、信号传输、中央控制室集中显示操作,这种可应用于多个行业的通用性强的自动化仪表模式还在酝酿之中。
60年代,以电子管为基础的DDZ-I型电动单元组合仪表,被以晶体管分立元件为基础的DDZ-II型电动单元组合仪表取代。这是面向石油、化工、冶金、电力、建材等行业,以温度、压力、流量、液位为主要控制参数的整套工业自动化仪表。这个时期由于生产设备的大型化,已经有了中央控制室,基地式仪表的操作方式逐步被取代,但各单元仪表之间的连络信号还不统一,以直流0~10mA的电流信号应用较广。
70年代,一机部组织了DDZ-Ill型仪表的统一设计工作。DDZ-III型是在线性集成电路(运算放大器)技术、国际统一信号、本质安全防爆等技术的基础上发展起来的,与此同时,组装式仪表装置也在兴起。
60年代末70年代初,国际电工委员会IEC规定了国际统一信号为直流4~20mA,直流l~5V为辅助信号。即以4~2(ADC为传输信号,以1~5VDC为接收信号。这个国际统一信号在当时执行起来,基本没有多大阻力,原因是其技术先进、切实可行,而且原来的制造厂和用户都迫切希望有统一的信号制。
DDZ-III型仪表总体设计时,为了顺应500万吨/年原油处理量的大型炼油厂的自控系统的要求,一是系统要求本质安全防爆,二是要考虑现场仪表与中控室距离较远(约500米以内)。在符合国际统一信号的基础上,选用24VDC统一供电和两线制变送器及安全栅的方案。当时线性集成电路和晶体管的水平能做到在24VDC供电条件下,控制室仪表外接导线电阻与两线制变送器内阻或执行器内阻串联,可具有恒流性能。4mA是为了保证两线制变送器放大器工作点必要的供电而设的。在要求防爆的场所,也能够承受24VDC、20mADC或比它稍高的电量,所以能满足上述两项要求。
DDZ-III型仪表的差压(压力)变送器,已经采用矢量机构的力平衡式的原理,比原来的位移式变送器机双杠杆力平衡式变话器有较大的进步。
产品承诺:
保 证 全新原装进口,
保 证 安全准时发货,
保 证售后服务质量,
优势价格,大量现货。
主营DCS系统配件
机器人系统配件
大型伺服系统配件
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