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class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>變截面流量計價錢,流量計</p><p><span>***更新：</span>2021-01-29 03:15:48</p><p><span id="click" >瀏覽次數(shù)：3次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="yx23ynk" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海翼爾電子科技有限公司</a></p><p><span>聯(lián)系人：</span>趙“S</p><p><span>郵箱: </span>yeertec@163.com</p><p><span>電話: </span>13361991561</p><p><span>傳真: </span>021_57155131</p><p><span>網(wǎng)址: </span>http://www.yeer-tec.com</p><p><span>手機: </span>021-57488360</p><p><span>地址: </span>海灣旅游區(qū)莘奉公路4960號110室</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="sbdf238" class="page-proshow02"><p class="title">詳細說明</p><div id="un84wtl" class="box"><p><p style="text-indent:25px">流量計保溫辦法：用保溫資料保溫，即用保溫資料將儀器外表易凍或怕凍的部位包起來。冬天來暫時要查看、常常排污，避免包裝的保溫資料破損。伴熱辦法：1、蒸汽伴熱辦法：即運用管蒸汽暖氣保溫。冬天保溫送汽之前要查看一下蒸汽保溫管路是不是疏通或阻塞。較好的蒸汽是24小時通的，不要太熱，有時還要依據(jù)氣候溫度改動來調(diào)整供保溫汽量，以避免溫度太高使變送器引壓管內(nèi)冷凝液汽化影響變送器作業(yè)或因溫度太低使變送器引壓管內(nèi)冷凝液冷凍影響變送器作業(yè)疏通。2、保溫維護箱辦法：a、電熱管伴熱保溫箱，由箱體、加熱器、外表托架等三大部分構(gòu)成，其構(gòu)造方式與維護箱一樣，所不一樣的是箱內(nèi)裝有電器加熱設(shè)備，起熱設(shè)備是由電熱管，變截面流量計價錢，溫度操控器構(gòu)成，變截面流量計價錢，箱體旁邊面裝有插座，變截面流量計價錢，當接通電源后，箱內(nèi)加熱到所需溫度時，再由溫度操控器接通電源持續(xù)升溫。經(jīng)過重復作業(yè)使箱內(nèi)溫度能保持在必定范圍內(nèi)。加強關(guān)于流量計基礎(chǔ)知識的培訓，以確保使用人員能夠熟練運用流量計。變截面流量計價錢</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="變截面流量計價錢,流量計" src="https://tyunfile.71360.com/UploadFile/yierdianzi/637407039080282827/1708933.png"></div><p style="text-indent:25px">孔板流量計在天然氣計量中的誤差原因分析：1 節(jié)流裝置，1.1孔板制造及安裝，采用孔板流量計時，對孔板加工的技術(shù)要求十分嚴格，必須符合國家標準或部頒標準中的規(guī)定，否則，會給天然氣流量測量結(jié)果帶來誤差。（1）孔板偏心：實驗表明，孔板偏心引起的計量誤差一般在2%以內(nèi)，孔徑比β值愈高，偏心率影響愈大，所以，應避免采用β值高的孔板。（2）孔板彎曲：由于安裝或維修不當，使孔板發(fā)生彎曲或變形，導致流量測量誤差較大。在法蘭取壓的孔板上進行測試結(jié)果，孔板彎曲產(chǎn)生的大的誤差約為3.5%。（3）節(jié)流裝置內(nèi)突出物：節(jié)流裝置中伸入管內(nèi)的墊片、焊縫等也會使流量測量產(chǎn)生一定的誤差，誤差大小與突出物的位置、孔板與突出物的距離以及突出高度有關(guān)。試驗證明，當β=0.7，突出物**于孔板上游2倍管徑處時，產(chǎn)生的誤差大的；若突出物位于上游孔板處，誤差為16%～50%，若將突出物位于孔板下游時，對計量準確度的影響要小些。變截面流量計價錢流量計又分為有差壓式流量計、轉(zhuǎn)子流量計、容積流量計、電磁流量計、超聲波流量計等。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="變截面流量計價錢,流量計" src="https://tyunfile.71360.com/UploadFile/yierdianzi/637407039069628540/5795593.png"></div><p style="text-indent:25px">差壓式流量計是根據(jù)安裝于管道中流量檢測件與流體相互作用產(chǎn)生的差壓，已知的流體條件和檢測件與管道的幾何尺寸來計算流量的儀表。差壓式流量計由一次裝置(檢測件）和二次裝置（差壓轉(zhuǎn)換器和流量顯示儀表）組成。通常以檢測件形式對差壓式流量計分類，如孔板流量計、文丘里流量計、均速管流量計、皮托管原理式-畢托巴流量計等。二次裝置為各種機械、電子、機電一體式差壓計,差壓變送器及流量顯示儀表。它已發(fā)展為三化（系列化、通用化及標準化）程度很高的、種類規(guī)格龐雜的一大類儀表，它既可測量流量參數(shù)，也可測量其它參數(shù)（如壓力、物位、密度等）。</p><p style="text-indent:25px">流量計在工程上常用單位m3/h，它可分為瞬時流量（Flow Rate）和累計流量（Total Flow），瞬時流量即單位時間內(nèi)過封閉管道或明渠有效截面的量，流過的物質(zhì)可以是氣體、液體、固體；累計流量即為在某一段時間間隔內(nèi)（兩天、一周、一月、一年）流體流過封閉管道或明渠有效截面的累計量。通過瞬時流量對時間積分亦可求得累計流量，所以瞬時流量計和累計流量計之間也可以相互轉(zhuǎn)化。流量計要盡量避開鐵磁性物體及具有強電磁場的設(shè)備(如大電機、大變壓器的等)，以免磁場影響傳感器的工作磁場和流量信號。傳感器勺轉(zhuǎn)換器間的流量信號線和激磁線。然而從雷電故障中損壞零部件的分析，引起故障的感應高電壓和浪涌電流大部分足從控制室電源線路引入的，其他兩條途徑較少。由于電磁流量計測量含有懸浮固相或污臟體的機會遠比其他流量儀表多，出現(xiàn)內(nèi)壁附著層產(chǎn)生的故障概率也就相對較高。若附著層電導率與液體電導率相近。常見的調(diào)試期故障通常由安裝不妥。流量計不能安裝在大型變壓器、電動機、機泵等產(chǎn)生較大磁場的設(shè)備附近。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="變截面流量計價錢,流量計" src="https://tyunfile.71360.com/UploadFile/yierdianzi/637407039103241803/4471718.png"></div><p style="text-indent:25px">電磁流量計的傳感器結(jié)構(gòu)簡單，測量管內(nèi)沒有可動部件，也沒有任何阻礙流體流動的節(jié)流部件。所以當流體通過流量計時不會引起任何附加的壓力損失，是流量計中運行能耗較低的流量儀表之一。、電磁流量計是一種體積流量測量儀表，在測量過程中，它不受被測介質(zhì)的溫度、粘度、密度以電導率(在一定范圍)的影響。因此，電磁流量計只需經(jīng)水標定后，就可心用來測量其它導電性液體的流量。電磁流量計的輸出只與被測介質(zhì)的平均流速成正比，而與對稱分布下的流動狀態(tài)(層流或湍流)無關(guān)。所以電磁流量計的量程范圍極寬，其測量范圍度可達10：1的可運行流量范圍。渦街流量計的體積流量不受被測流體的溫度、壓力、密度或粘度等熱工參數(shù)的影響。變截面流量計價錢</p><p style="text-indent:25px">渦街流量計可以測量液體、氣體或蒸汽的流量。變截面流量計價錢</p><p style="text-indent:25px">差壓式流量計應用范圍特別廣。差壓式流量計在封閉管道的流量測量中各種對象都有應用。如流體方面：單相、混相、潔凈、臟污、粘性流等；工作狀態(tài)方面：常壓、高壓、真空、常溫、高溫、低溫等；管徑方面：從幾mm到幾m；流動條件方面：亞音速、音速、脈動流等。它在各工業(yè)部門的用量約占流量計全部用量的1/4~1/3。1、常用標準節(jié)流裝置（孔板）、（噴嘴）、（文丘利管）。2、常用非標準節(jié)流裝置有（雙重孔板）、（圓缺孔板）、（1/4圓噴嘴）和（文丘利噴嘴）。3、孔板常用取壓方法有（角接取壓）、（法蘭取壓），其它方法有（理論取壓）、（徑距取壓）和（管接取壓）。4、標準孔板法蘭取壓法，上下游取壓孔中心距孔板前后端面的間距均為（25.4±0.8）mm，也叫1英寸法蘭取壓。變截面流量計價錢</p></p><br /><p>文章來源地址: 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