Panasonic MGM-32262S,Panasonic MGM-32262S
差壓變送器傳遞的模擬信號，也由多種電氣信號0~10mv、0~10mA、0~20mA等輸出，發(fā)展到采用國際統(tǒng)一標準4~20mA信號，或帶HARA協(xié)議輸出，進入數(shù)字式后，有多種總線協(xié)議共存的現(xiàn)象，在眾多的現(xiàn)場總線協(xié)議中，由浙江中控領(lǐng)銜制定的EPA協(xié)議已納入國際標準，正在推廣應用，為國人贏得話語權(quán)，這是一個良好的開端，目前正在積極推廣應用中，差壓變送器的檢測信號傳輸?shù)难葑內(nèi)鐖D7所示。流程工業(yè)控制操作的演變?nèi)祟愒谕匀贿M行長期的艱苦斗爭中，積累了豐富的經(jīng)驗教訓，有了飛躍的發(fā)展。在手工作坊時代，人類用手工操作方法制造機器，后來進入以金屬（主要是鐵）為材料、用機器進行生產(chǎn)加工的
機械化時代，這就是第一次技術(shù)革命。隨后是第二次技術(shù)革命的電氣時代和第三次技術(shù)革命的電子時代，現(xiàn)在又在醞釀新的技術(shù)革命，用一種時髦的說法就是信息時代，或知識經(jīng)濟社會等等。綜觀這三次技術(shù)革命，不難發(fā)現(xiàn)，由于工藝流程的改進和生產(chǎn)規(guī)模的擴大，儀器儀表與自動化技術(shù)的發(fā)展對流程工業(yè)的操作演變起著決定性作用。一旦了解這種總體的歷史背景，就能理解，在新中國成立60年來流程工業(yè)控制操作方式的演變軌跡中，儀器儀表與自動化技術(shù)的發(fā)展同樣起到不可替代的作用。60年來控制操作方式的演變?nèi)鐖D8所示。 53MC5212B41BAF1XXXXX
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MicroMod
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