描述

FOXBORO-FBM202

70年代中期以前的發(fā)展
20世紀，自動化科學技術的建立以及工業(yè)的發(fā)展，逐漸形成了自動化儀表工業(yè)。50年代以前，PID調節(jié)已很流行，但集檢測、調節(jié)、執(zhí)行功能于一體的基地式儀表仍為主流熱工儀表。功能分離、信號傳輸、中央控制室集中顯示操作，這種可應用于多個行業(yè)的通用性強的自動化儀表模式還在醞釀之中。
60年代，以電子管為基礎的DDZ－I型電動單元組合儀表，被以晶體管分立元件為基礎的DDZ-II型電動單元組合儀表取代。這是面向石油、化工、冶金、電力、建材等行業(yè)，以溫度、壓力、流量、液位為主要控制參數(shù)的整套工業(yè)自動化儀表。這個時期由于生產設備的大型化，已經有了中央控制室，基地式儀表的操作方式逐步被取代，但各單元儀表之間的連絡信號還不統(tǒng)一，以直流0～10mA的電流信號應用較廣。
70年代，一機部組織了DDZ－Ill型儀表的統(tǒng)一設計工作。DDZ-III型是在線性集成電路（運算放大器）技術、國際統(tǒng)一信號、本質安全防爆等技術的基礎上發(fā)展起來的，與此同時，組裝式儀表裝置也在興起。
60年代末70年代初，國際電工委員會IEC規(guī)定了國際統(tǒng)一信號為直流4～20mA，直流l～5V為輔助信號。即以4～2（ADC為傳輸信號，以1～5VDC為接收信號。這個國際統(tǒng)一信號在當時執(zhí)行起來，基本沒有多大阻力，原因是其技術先進、切實可行，而且原來的制造廠和用戶都迫切希望有統(tǒng)一的信號制。
DDZ－III型儀表總體設計時，為了順應500萬噸／年原油處理量的大型煉油廠的自控系統(tǒng)的要求，一是系統(tǒng)要求本質安全防爆，二是要考慮現(xiàn)場儀表與中控室距離較遠（約500米以內）。在符合國際統(tǒng)一信號的基礎上，選用24VDC統(tǒng)一供電和兩線制變送器及安全柵的方案。當時線性集成電路和晶體管的水平能做到在24VDC供電條件下，控制室儀表外接導線電阻與兩線制變送器內阻或執(zhí)行器內阻串聯(lián)，可具有恒流性能。4mA是為了保證兩線制變送器放大器工作點必要的供電而設的。在要求防爆的場所，也能夠承受24VDC、20mADC或比它稍高的電量，所以能滿足上述兩項要求。
DDZ-III型儀表的差壓（壓力）變送器，已經采用矢量機構的力平衡式的原理，比原來的位移式變送器機雙杠桿力平衡式變話器有較大的進步。

產品承諾：
保?證?全新原裝進口,
保?證?安全準時發(fā)貨，
保?證售后服務質量，
優(yōu)勢價格，大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
品牌：ABB???,AB??,GE,FOXBORO,本特利，英維思，伍德沃德，西屋，瑞恩，施耐德，西門子，摩托羅拉，安川。力士樂。ACSO，橫河等進口品牌。Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA

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