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  • Ethernet 與現場總線器

    2010-04-18 1引言二十一(yi)世紀是(shi)信(xin)息(xi)經濟的(de)(de)時(shi)代。隨著計(ji)算(suan)(suan)機(ji)(ji)技(ji)術(shu)、信(xin)息(xi)技(ji)術(shu)的(de)(de)飛速(su)發展，市(shi)場進一(yi)步形成(cheng)，競爭也加劇，產(chan)品(pin)技(ji)術(shu)含量更(geng)(geng)高(gao)、換代時(shi)間(jian)更(geng)(geng)短。處(chu)于市(shi)場之中的(de)(de)工業生(sheng)產(chan)為了(le)適應市(shi)場競爭的(de)(de)需要(yao)(yao)，在(zai)追求競爭力的(de)(de)過程(cheng)中逐(zhu)漸形成(cheng)了(le)計(ji)算(suan)(suan)機(ji)(ji)集(ji)成(cheng)制造(zao)系(xi)統(tong)。計(ji)算(suan)(suan)機(ji)(ji)集(ji)成(cheng)制造(zao)系(xi)統(tong)采用系(xi)統(tong)集(ji)成(cheng)、信(xin)息(xi)集(ji)成(cheng)的(de)(de)觀(guan)點組織生(sheng)產(chan)，把市(shi)場、生(sheng)產(chan)計(ji)劃、制造(zao)過程(cheng)、企(qi)業管理、售后服(fu)務看(kan)作要(yao)(yao)統(tong)一(yi)考慮的(de)(de)生(sheng)產(chan)過程(cheng)，并采用計(ji)算(suan)(suan)機(ji)(ji)、自動控制、網絡(luo)通信(xin)等技(ji)術(shu)來(lai)實現整個過程(cheng)的(de)(de)綜(zong)合自動化，以(yi)改善生(sheng)產(chan)加工、管理決策等。為了(le)實現這(zhe)個目標，必須(xu)要(yao)(yao)將企(qi)業內...

  • 溫度儀表產品執行標準

    2010-04-18 熱(re)電(dian)偶第(di)(di)1部(bu)分：分度表(biao)標(biao)準(zhun)(zhun)(zhun)(zhun)代(dai)號：GB/T16839.1-1997標(biao)準(zhun)(zhun)(zhun)(zhun)提(ti)(ti)出單(dan)(dan)位(wei)：全國工業(ye)過程(cheng)(cheng)測(ce)量和控制(zhi)標(biao)準(zhun)(zhun)(zhun)(zhun)化(hua)技術委員會(hui)標(biao)準(zhun)(zhun)(zhun)(zhun)起草(cao)單(dan)(dan)位(wei)：上海(hai)工業(ye)自動(dong)化(hua)儀(yi)(yi)表(biao)研究所(suo)、重慶儀(yi)(yi)表(biao)材料研究所(suo)等標(biao)準(zhun)(zhun)(zhun)(zhun)內容：提(ti)(ti)供了將熱(re)電(dian)偶電(dian)勢轉(zhuan)換(huan)成(cheng)其對應的(de)被測(ce)溫度和被測(ce)溫度轉(zhuan)換(huan)成(cheng)相對應的(de)熱(re)電(dian)偶電(dian)勢的(de)分度表(biao)。熱(re)電(dian)偶第(di)(di)2部(bu)分：允差標(biao)準(zhun)(zhun)(zhun)(zhun)代(dai)號：GB/T16839.2-1997標(biao)準(zhun)(zhun)(zhun)(zhun)提(ti)(ti)出單(dan)(dan)位(wei)：全國工業(ye)過程(cheng)(cheng)測(ce)量和控制(zhi)標(biao)準(zhun)(zhun)(zhun)(zhun)化(hua)技術委員會(hui)標(biao)準(zhun)(zhun)(zhun)(zhun)起草(cao)單(dan)(dan)位(wei)：上海(hai)工業(ye)自動(dong)化(hua)儀(yi)(yi)表(biao)研究所(suo)、重慶儀(yi)(yi)表(biao)材料研究所(suo)等標(biao)準(zhun)(zhun)(zhun)(zhun)內容：提(ti)(ti)供了標(biao)準(zhun)(zhun)(zhun)(zhun)第(di)(di)1部(bu)分電(dian)動(dong)勢-...

  • 橡套電纜型號簡介

    2010-04-18 橡套(tao)電(dian)(dian)(dian)纜(lan)是由多股的細(xi)銅絲(si)為導體,外(wai)包橡膠絕緣和橡膠護套(tao)的一種柔軟(ruan)可(ke)移動(dong)(dong)的電(dian)(dian)(dian)纜(lan)品種.一般(ban)(ban)來講,包括通用(yong)(yong)(yong)(yong)橡套(tao)軟(ruan)電(dian)(dian)(dian)纜(lan),電(dian)(dian)(dian)焊(han)機電(dian)(dian)(dian)纜(lan),潛水電(dian)(dian)(dian)機電(dian)(dian)(dian)纜(lan),無(wu)線(xian)電(dian)(dian)(dian)裝置電(dian)(dian)(dian)纜(lan)和攝(she)影光源(yuan)(yuan)電(dian)(dian)(dian)纜(lan)等(deng)品種.橡套(tao)電(dian)(dian)(dian)纜(lan)廣(guang)泛使(shi)用(yong)(yong)(yong)(yong)于各(ge)種電(dian)(dian)(dian)器(qi)設(she)備,例(li)如日用(yong)(yong)(yong)(yong)電(dian)(dian)(dian)器(qi),電(dian)(dian)(dian)動(dong)(dong)機械(xie),電(dian)(dian)(dian)工(gong)裝置和器(qi)具的移動(dong)(dong)式電(dian)(dian)(dian)源(yuan)(yuan)線(xian),同時(shi)可(ke)在室(shi)內(nei)或戶外(wai)環(huan)境條件下使(shi)用(yong)(yong)(yong)(yong).根據電(dian)(dian)(dian)纜(lan)所受的機械(xie)外(wai)力,在產品結構上(shang)分為輕(qing)型(xing),中型(xing)和重(zhong)型(xing)三(san)類,在截(jie)面上(shang)也有(you)適當的銜接(jie).一般(ban)(ban)輕(qing)型(xing)橡套(tao)電(dian)(dian)(dian)纜(lan)使(shi)用(yong)(yong)(yong)(yong)于日用(yong)(yong)(yong)(yong)電(dian)(dian)(dian)器(qi),小(xiao)型(xing)電(dian)(dian)(dian)動(dong)(dong)設(she)備,要求柔軟(ruan),輕(qing)巧,彎曲性能(neng)好;中型(xing)橡套(tao)電(dian)(dian)(dian)纜(lan)除(chu)工(gong)業用(yong)(yong)(yong)(yong)外(wai),廣(guang)...

  • 熱電阻的應用原理

    2010-04-11 熱(re)電(dian)阻(zu)是(shi)中低(di)溫(wen)區zui常(chang)用(yong)(yong)的(de)(de)(de)(de)(de)一(yi)(yi)種溫(wen)度(du)(du)檢(jian)測(ce)器。它(ta)的(de)(de)(de)(de)(de)主(zhu)要特(te)點是(shi)測(ce)量精度(du)(du)高，性能穩定。其中鉑(bo)熱(re)是(shi)阻(zu)的(de)(de)(de)(de)(de)測(ce)量度(du)(du)是(shi)zui高的(de)(de)(de)(de)(de)，它(ta)不僅廣泛(fan)應用(yong)(yong)于工業(ye)測(ce)溫(wen)，而(er)且被制成(cheng)標準(zhun)的(de)(de)(de)(de)(de)基(ji)(ji)準(zhun)儀。1.測(ce)溫(wen)原理(li)及(ji)材(cai)料(liao)測(ce)溫(wen)是(shi)基(ji)(ji)于金(jin)屬導體(ti)的(de)(de)(de)(de)(de)電(dian)阻(zu)值隨溫(wen)度(du)(du)的(de)(de)(de)(de)(de)增加而(er)增加這一(yi)(yi)特(te)性來(lai)進行(xing)溫(wen)度(du)(du)測(ce)量的(de)(de)(de)(de)(de)。大(da)都由純金(jin)屬材(cai)料(liao)制成(cheng)，目前應用(yong)(yong)zui多的(de)(de)(de)(de)(de)是(shi)鉑(bo)和銅，此外，現在(zai)已(yi)開(kai)始采用(yong)(yong)甸、鎳(nie)、錳(meng)和銠等(deng)材(cai)料(liao)制造。2.結(jie)構(gou)(1)精通型熱(re)電(dian)阻(zu)工業(ye)常(chang)用(yong)(yong)感溫(wen)元(yuan)件(電(dian)阻(zu)體(ti))的(de)(de)(de)(de)(de)結(jie)構(gou)及(ji)特(te)點見表2-1-11。從測(ce)溫(wen)原理(li)可知(zhi)，被測(ce)溫(wen)度(du)(du)的(de)(de)(de)(de)(de)變化是(shi)直接(jie)通過阻(zu)值的(de)(de)(de)(de)(de)變化...

  • 電線電纜的安裝與施工注意事項

    2010-04-11 經營：耐磨(mo)熱電(dian)(dian)(dian)偶,高(gao)溫補償導線,分支(zhi)電(dian)(dian)(dian)纜(lan)(lan),橋架(jia)母線通過對線路故障統(tong)(tong)計分析(xi)，由于施(shi)工、安(an)裝(zhuang)和(he)接續等因素造成的(de)故障往往要(yao)比電(dian)(dian)(dian)線電(dian)(dian)(dian)纜(lan)(lan)本體缺(que)陷造成的(de)故障可能(neng)性大得(de)多(duo)。因此要(yao)正(zheng)確地選(xuan)用電(dian)(dian)(dian)線電(dian)(dian)(dian)纜(lan)(lan)及配(pei)套附件，除按規(gui)范要(yao)求進行(xing)(xing)(xing)設(she)計和(he)施(shi)工外，還應注(zhu)意如下幾個方面的(de)問題：⒈電(dian)(dian)(dian)纜(lan)(lan)敷設(she)安(an)裝(zhuang)應由有(you)資(zi)格的(de)專業(ye)單位或專業(ye)人(ren)員(yuan)進行(xing)(xing)(xing)，不符合有(you)關規(gui)范規(gui)定(ding)要(yao)求的(de)施(shi)工和(he)安(an)裝(zhuang)，有(you)可能(neng)導致(zhi)電(dian)(dian)(dian)纜(lan)(lan)系統(tong)(tong)不能(neng)正(zheng)常(chang)運(yun)行(xing)(xing)(xing)。⒉人(ren)力(li)敷設(she)電(dian)(dian)(dian)纜(lan)(lan)時，應統(tong)(tong)一(yi)指揮(hui)控(kong)制節奏(zou)，每隔1.5～3米有(you)一(yi)人(ren)肩扛(kang)電(dian)(dian)(dian)纜(lan)(lan)，邊放邊拉(la)，慢慢施(shi)放。⒊機械施(shi)放電(dian)(dian)(dian)纜(lan)(lan)時，一(yi)...

  • 熱電偶的冷端補償問題

    2010-04-11 摘要:熱(re)電(dian)(dian)偶(ou)(ou)在I業(ye)控(kong)(kong)制(zhi)中(zhong)應(ying)用(yong)極(ji)為廣(guang)泛，其冷端補償(chang)直(zhi)接影響到測(ce)量(liang)和控(kong)(kong)制(zhi)的(de)精硝度(du)(du)。本(ben)文提出1幾種(zhong)具體(ti)的(de)補償(chang)辦(ban)法(fa)和實際補償(chang)電(dian)(dian)路(lu)的(de)計算(suan)方法(fa)及設計思(si)路(lu)。在工(gong)業(ye)控(kong)(kong)制(zhi)中(zhong)，溫(wen)度(du)(du)是(shi)(shi)(shi)(shi)一(yi)個重要參數(shu)，我們zui常(chang)見的(de)測(ce)溫(wen)方法(fa)是(shi)(shi)(shi)(shi)采用(yong)溫(wen)度(du)(du)傳感(gan)器和溫(wen)度(du)(du)指示儀(yi)表(biao)，熱(re)電(dian)(dian)偶(ou)(ou)是(shi)(shi)(shi)(shi)我們常(chang)用(yong)的(de)溫(wen)度(du)(du)傳感(gan)器,由于熱(re)電(dian)(dian)偶(ou)(ou)種(zhong)類多、測(ce)溫(wen)范(fan)圍廣(guang)、性(xing)能較(jiao)(jiao)穩定、工(gong)業(ye)用(yong)熱(re)電(dian)(dian)偶(ou)(ou)價(jia)格較(jiao)(jiao)低廉等(deng)特點，在工(gong)業(ye)生產和控(kong)(kong)制(zhi)中(zhong)獲得了廣(guang)泛的(de)應(ying)用(yong)。但(dan)熱(re)電(dian)(dian)偶(ou)(ou)應(ying)用(yong)有兩大(da)問題：一(yi)是(shi)(shi)(shi)(shi)熱(re)電(dian)(dian)偶(ou)(ou)的(de)非(fei)線性(xing)問題，非(fei)線性(xing)將給測(ce)量(liang)帶來(lai)誤差，一(yi)般在二次儀(yi)表(biao)中(zhong)進行非(fei)線性(xing)校正二是(shi)(shi)(shi)(shi)熱(re)電(dian)(dian)...

  • 如何正確使用熱電偶補償導線

    2010-04-01 摘要(yao)在(zai)使(shi)(shi)用熱電(dian)(dian)偶(ou)(ou)進(jin)行(xing)溫(wen)度(du)測量(liang)中,熱電(dian)(dian)偶(ou)(ou)補(bu)償(chang)(chang)導線(xian)的(de)使(shi)(shi)用比較普(pu)遍(bian)。但經調查發現,很多(duo)地方(fang)由(you)于(yu)(yu)沒有(you)正確(que)使(shi)(shi)用補(bu)償(chang)(chang)導線(xian)而(er)出(chu)現很多(duo)問(wen)題。本文介紹了(le)詳細(xi)原理(li),對常見錯(cuo)誤(wu)使(shi)(shi)用的(de)形(xing)式進(jin)行(xing)歸納,同時從理(li)論(lun)上(shang)分(fen)析所產生的(de)偏差(cha),指出(chu)正確(que)使(shi)(shi)用方(fang)法(fa)和注意事(shi)項。熱電(dian)(dian)偶(ou)(ou)補(bu)償(chang)(chang)導線(xian)已經廣(guang)泛(fan)用于(yu)(yu)熱電(dian)(dian)偶(ou)(ou)溫(wen)度(du)測量(liang)中。如果了(le)解了(le)原理(li)、功能、作用方(fang)法(fa)和注意事(shi)項,就能充分(fen)發揮作用,否則就會(hui)適得其(qi)反。某鋼管生產企業(ye)新引進(jin)的(de)一套(tao)球化爐裝置,裝置的(de)二(er)十(shi)多(duo)個測溫(wen)點由(you)于(yu)(yu)設備安(an)裝人員(yuan)將正負極接反,且(qie)補(bu)償(chang)(chang)導線(xian)還(huan)存在(zai)多(duo)接頭現象,再加上(shang)設備...
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