C98043-A7002-L1-12產(chǎn)品描述：
C98043-A7002-L1-12
在現(xiàn)代氣體分析儀器的設(shè)計(jì)中，主要包括兩種設(shè)計(jì)方案。一種是以分離器件和小規(guī)模集成電路為基礎(chǔ)的模擬信號(hào)處理方案，這類(lèi)儀器主要應(yīng)用于功能簡(jiǎn)單的小型儀器，它們一般只能進(jìn)行簡(jiǎn)單的測(cè)試，由于儀器內(nèi)部沒(méi)有專(zhuān)門(mén)的功能軟件，所以無(wú)法完成更進(jìn)一步的數(shù)據(jù)處理和計(jì)算功能，這類(lèi)產(chǎn)品一般都做成便攜式儀器，間斷的對(duì)氣體進(jìn)行取樣檢查。第二種方案是以單片機(jī)技術(shù)為基礎(chǔ)的數(shù)字電路處理方案，這類(lèi)儀器在進(jìn)行信號(hào)處理和數(shù)據(jù)通訊方面具有較高的靈活性，在氣體分析儀器行業(yè)中處于主流地位，已基本能夠完成必要的數(shù)據(jù)處理和運(yùn)算功能。對(duì)于一些具有高集成的單片機(jī)系統(tǒng)，它具有更全面的功能。但是對(duì)多種組份、多路通道、惡劣環(huán)境的氣體測(cè)量要求，對(duì)采樣氣體需要進(jìn)行必要的預(yù)處理的應(yīng)用要求，以單片機(jī)技術(shù)為基礎(chǔ)的氣體分析儀在設(shè)計(jì)時(shí)存在著較大的難度。針對(duì)第二種方案的不足，我們把氣體分析預(yù)處理系統(tǒng)單獨(dú)分離出來(lái)，用成熟靈活的PLC系統(tǒng)來(lái)設(shè)計(jì)。
氣體預(yù)處理系統(tǒng)是可靠性和穩(wěn)定性要求最高的氣體分析子系統(tǒng)，其性能直接決定了采樣氣體的質(zhì)量?；赑LC的氣體預(yù)處理系統(tǒng)可以實(shí)現(xiàn)氣體的自動(dòng)連續(xù)采樣。采用不同測(cè)量方法的氣體分析系統(tǒng)都由采樣預(yù)處理系統(tǒng)和分析儀表兩部分組成。采樣探頭將被測(cè)氣體從煙道或管道中引出，并送入預(yù)處理系統(tǒng)進(jìn)行氣體預(yù)處理，然后連續(xù)送入儀器的氣體室中，分析儀器通過(guò)不同的方法完成氣體濃度的測(cè)量。采樣預(yù)處理系統(tǒng)完成氣體的采樣工作，其基本原理分為正壓和負(fù)壓兩種，由PLC完成各管路電磁閥和電動(dòng)閥的時(shí)序動(dòng)作。
氣體分析輔助系統(tǒng)由以PLC為核心的控制機(jī)柜、執(zhí)行機(jī)構(gòu)、聲光報(bào)警和一次、二次外圍元件組成，控制柜里配置有PLC、報(bào)警繼電器、泵、閥等。每一路輸出通道都有與之相對(duì)應(yīng)的流程指示燈，可以檢查某一通道的當(dāng)前工作情況，而且系統(tǒng)具有自動(dòng)巡檢和手動(dòng)功能。
本系統(tǒng)的CPU模塊選用和利時(shí)LM系列PLC的LM3107E模塊，模塊本體上集成12點(diǎn)數(shù)字量輸入和8點(diǎn)繼電器輸出，還有2路模擬量輸入和1路模擬量輸出。系統(tǒng)采用LM3223擴(kuò)展8通道繼電器輸出。系統(tǒng)中顯示部件采用和利時(shí)HT7700T觸摸屏，通過(guò)串口以ModbusRTU的協(xié)議與PLC的RS232串口通訊，通過(guò)觸摸屏可以對(duì)氣體預(yù)處理系統(tǒng)的各個(gè)通道進(jìn)行手動(dòng)和自動(dòng)操作、參數(shù)設(shè)置、報(bào)警顯示、氣體含量顯示及曲線繪制等。觸摸屏的以太網(wǎng)口可以與上位計(jì)算機(jī)進(jìn)行通信，采用ModbusTCP協(xié)議進(jìn)行遠(yuǎn)程管控。
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