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</a></p></div></div><div id="i77wqu2" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="mld3c2y" class="box"><p><p> 高溫型（80度至500度）、常溫型（-20度至70度）、低溫型（-20至-200度）流量計(jì)的安裝： </p> <p> a、常溫型、低溫型、高溫型流量計(jì)視不同工況采用水平、垂直或倒置式安裝（以出廠校驗(yàn)單為準(zhǔn)）；b、介質(zhì)工作溫度在300度以上時(shí)，用戶應(yīng)對(duì)流量計(jì)殼體采取隔熱措施防止熱輻射損壞表頭(表頭工作溫度為-30至70度)，同理工作溫度-100度以下的介質(zhì)，也要采取防凍措施；c、為保證流量計(jì)準(zhǔn)確計(jì)量，要求設(shè)置前后直管段；）d、為保證流量計(jì)在檢查及更換時(shí)不影響系統(tǒng)工作，應(yīng)盡量設(shè)置旁通閥（3）及切斷閥（1、2）；e、因工藝需要可采用垂直安裝，被測(cè)介質(zhì)流向可由下至上，也可由上至下，熱式流量計(jì)聯(lián)系方式，但訂購時(shí)應(yīng)向供貨方說明。電磁流量計(jì)，熱式流量計(jì)聯(lián)系方式，熱式流量計(jì)聯(lián)系方式、超聲波流量計(jì)、渦街流量計(jì)利用電氣原理工作，從而避免了機(jī)械流量計(jì)工作中需要更換的運(yùn)動(dòng)機(jī)件。熱式流量計(jì)聯(lián)系方式</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="熱式流量計(jì)聯(lián)系方式,流量計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/xalunqian/637332520164541016/3121473.png"></div><p> （1）渦街流量變送器的選擇 </p> <p> 在飽和蒸汽測(cè)量中采用VA型壓電式渦街流量變送器，由于渦街流量計(jì)量程范圍寬，因此，在實(shí)際應(yīng)用中，一般插入式渦街流量計(jì)主要考慮測(cè)量飽和蒸汽的流量不得低于渦街流量計(jì)的下限，也就是說必須滿足流體流速不得低于5m/s。根據(jù)用汽量的大小選用不同口徑的渦街流量變送器，而不能以現(xiàn)有的工藝管道口徑來選擇變送器口徑。 </p> <p> （2）壓力補(bǔ)償壓力變送器的選擇 </p> <p> 由于飽和蒸汽管路長，壓力波動(dòng)較大，必須采用壓力補(bǔ)償，考慮到壓力、溫度及密度的對(duì)應(yīng)關(guān)系，測(cè)量中只采用壓力補(bǔ)償即可，由于明通公司管道飽和蒸汽壓力在0.3－0.7MPa范圍，壓力變送器的量程選擇1MPa即可。 </p> <p> （3）顯示儀表選擇 </p> <p> 顯示儀表智能流量顯示儀，具有穩(wěn)壓補(bǔ)償、瞬時(shí)流量顯示和累積流量積算功能。熱式流量計(jì)聯(lián)系方式分流型相對(duì)于全流型只有部分被測(cè)流體流過浮子等流量檢測(cè)部分。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="熱式流量計(jì)聯(lián)系方式,流量計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/xalunqian/637332520990390625/5084448.png"></div><p> 按照外加磁場(chǎng)類型的不同，電磁流量計(jì)主要有直流式和感應(yīng)式兩種。直流式電磁流量計(jì)的外加恒下磁場(chǎng)B垂直于管軸，C、D處裝有兩個(gè)電極，用來測(cè)量流體橫越磁場(chǎng)時(shí)所感生的電動(dòng)勢(shì)U。流量Q可用下式求出： </p> <p> Q=(1/K).(UA/Bd) </p> <p> 式中A為管道橫截面積；d為管道直徑；k為修正系數(shù)，用來修正導(dǎo)出公式時(shí)未計(jì)及的因素（如流量計(jì)管道內(nèi)的流速事實(shí)上并不均勻）的影響。在常的流量計(jì)中，k約為0.8，但對(duì)于特定尺寸、用于特定工況的電磁流量計(jì)，則要用容積法（一定時(shí)間內(nèi)流過的容積）標(biāo)定k值。磁場(chǎng)可由永久磁鐵產(chǎn)生，磁鐵材料一般是鋁－鎳－鈷合金。流量大時(shí)，因管徑較大，故采用無鐵芯激磁繞組，通以它常直流電流來產(chǎn)生一個(gè)近似均勻的磁場(chǎng)。 </p><p> 1、流量計(jì)的選用原則: </p> <p> 流量計(jì)的選用主要參考流量范圍（L/h）、溫度（℃）、壓力（MPa）、口徑（mm）、黏度（mPa·s）、計(jì)量精度、腐蝕性、周圍工作環(huán)境、計(jì)算器形式等。 </p> <p> 2、流量計(jì)的安裝: </p> <p> 任何類型的流量計(jì)都有一定的安裝要求，只有正確安裝才能使流量計(jì)正常、準(zhǔn)確地運(yùn)行。流量計(jì)的安裝應(yīng)按產(chǎn)品使用說明書的要求，結(jié)合安裝現(xiàn)場(chǎng)的實(shí)際情況，以zui合適的方式進(jìn)行。 </p> <p> 3、流量計(jì)的使用與維護(hù): </p> <p> 只有當(dāng)流量計(jì)正確使用并及時(shí)的維護(hù)時(shí)，流量計(jì)才能以規(guī)定的精度運(yùn)行。 </p> <p> （1）使用流量計(jì)時(shí)應(yīng)按照規(guī)定的流量范圍、工作壓力和工作溫度，不得隨意超出范圍以確保測(cè)量精度及使用壽命。 </p> <p> （2）對(duì)于運(yùn)行中的流量計(jì)，應(yīng)按時(shí)巡檢，并記錄有關(guān)運(yùn)行參數(shù)，如溫度、濕度、壓力、噪聲及有無滲漏等。 </p> <p> （3）長時(shí)間不用的流量計(jì)應(yīng)將殼內(nèi)殘留的流體泄放掉，根據(jù)需要涂防腐劑。 </p> <p> （4）對(duì)于一些國家特定的流量計(jì)量儀表，按規(guī)定按期強(qiáng)制標(biāo)定。渦輪流量計(jì)是速度式流量計(jì)中的主要種類，采用多葉片的轉(zhuǎn)子感受流體平均流速，從而推導(dǎo)出流量或總量的儀表。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="熱式流量計(jì)聯(lián)系方式,流量計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/xalunqian/637332520569794922/6545301.png"></div><p> 各種超聲流量計(jì)已廣用于工業(yè)生產(chǎn)、商業(yè)計(jì)量和水利檢測(cè)等方面，如:在市政行業(yè)的原水、自來水、中水、污水的計(jì)量中，超聲流量計(jì)具有大量程比、無壓損的特點(diǎn)，在保證測(cè)量準(zhǔn)確度的同時(shí)提高了管網(wǎng)的輸水效率;在水利水電行業(yè)的輸水管道、渠道、泵站、電站的流量計(jì)量中，超聲流量計(jì)具有大口徑、現(xiàn)場(chǎng)安裝、在線標(biāo)定的特點(diǎn)，使準(zhǔn)確測(cè)量成為可能。同時(shí)通過對(duì)水泵、水輪機(jī)單泵、單機(jī)的計(jì)量來實(shí)現(xiàn)設(shè)備優(yōu)化、經(jīng)濟(jì)運(yùn)行的目的;在工業(yè)冷卻循環(huán)水的計(jì)量中，超聲流量計(jì)實(shí)現(xiàn)了在線不斷流帶壓安裝和在線標(biāo)定;在商業(yè)計(jì)量方面多聲道超聲流量計(jì)已達(dá)到優(yōu)于(示值誤差)。(1)傳播時(shí)間法應(yīng)用于清潔、單相液體和氣體。典型應(yīng)用有工廠排放液、:怪液、液化天然氣等;(2)氣體應(yīng)用方面在高壓天然氣領(lǐng)域已有使用良好的經(jīng)驗(yàn);(3)多普勒法適用于異相含量不太高的雙相流體,例如:未處理污水、工廠排放液、臟流程液;通常不適用于非常清潔的液體。為了使電磁流量計(jì)的傳感小型化和改善信噪比，出現(xiàn)了用非均勻磁場(chǎng)和低頻勵(lì)磁方式的電磁流量計(jì)。熱式流量計(jì)聯(lián)系方式</p><p style="text-indent:25px">為使電磁流量計(jì)的傳感器小型化和改善信噪比而出現(xiàn)用非均勻磁場(chǎng)和低頻勵(lì)磁方式的電磁流量計(jì)。熱式流量計(jì)聯(lián)系方式</p><p> 電磁流量計(jì)的特點(diǎn)： </p> <p> 1、測(cè)量不受流體密度、粘度、溫度、壓力和電導(dǎo)率變化的影響； </p> <p> 2、測(cè)量管內(nèi)無阻礙流動(dòng)部件，無壓損，直管段要求較低。對(duì)漿液測(cè)量有獨(dú)特的適應(yīng)性； </p> <p> 3、合理選擇傳感器襯里和電極材料，即具有良好的耐腐蝕和耐磨損性； </p> <p> 4、轉(zhuǎn)換器采用新穎勵(lì)磁方式，功耗低、零點(diǎn)穩(wěn)定、精確度高。流量范圍度可達(dá)150：1； </p> <p> 5、轉(zhuǎn)換器可與傳感器組成一體型或分離型； </p> <p> 6、轉(zhuǎn)換器采用16位高性能微處理器，2x16LCD顯示，參數(shù)設(shè)定方便，編程可靠； </p> <p> 7、流量計(jì)為雙向測(cè)量系統(tǒng)，內(nèi)裝三個(gè)積算器：正向總量、反向總量及差值總量；可顯示正、反流量，并具有多種輸出：電流、脈沖、數(shù)字通訊、HART； </p> <p> 8、轉(zhuǎn)換器采用表面安裝技術(shù)(SMT)，具有自檢和自診斷功能； </p> <p> 9、測(cè)量精度不受流體密度、粘度、溫度、壓力和電導(dǎo)率變化的影響，傳感器感應(yīng)電壓信號(hào)與平均流速呈線性關(guān)系，因此測(cè)量精度高。 </p> <p> 10、測(cè)量管道內(nèi)無阻流件，因此沒有附加的壓力損失；測(cè)量管道內(nèi)無可動(dòng)部件，因此傳感器壽命極長。 </p> <p> 11、由于感應(yīng)電壓信號(hào)是在整個(gè)充滿磁場(chǎng)的空間中形成的，是管道載面上的平均值，因此傳感器所需的直管段較短，長度為5倍的管道直徑。 </p> <p> <br /> 熱式流量計(jì)聯(lián)系方式</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2932588.html</p></div></div></div></div></div><div id="dholim7" class="page-right twoColRt"><div id="bfh8xbq" class="box01 margin10 clearfix"><h3><a 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