KIMO差壓變送器天驥教您如何校準

我們的(de)(de)團隊時刻準備(bei)著為(wei)您特定的(de)(de)需求(qiu)運用(yong)我們雄(xiong)厚的(de)(de)專業知識。憑借著我們的(de)(de)經(jing)驗(yan)，我們會(hui)與(yu)您一同發現問題(ti)(ti)，更好(hao)地(di)理解您的(de)(de)問題(ti)(ti)、需求(qiu)和(he)目(mu)(mu)標。而(er)后(hou)，我們會(hui)運用(yong)我們業已驗(yan)證的(de)(de)項目(mu)(mu)實(shi)施方(fang)法來實(shi)現您公(gong)司或團隊的(de)(de)既定目(mu)(mu)標。

產品在(zai)全球各地提供統一服務(wu)，所以(yi)您(nin)(nin)無(wu)需(xu)擔心(xin)您(nin)(nin)身處(chu)哪個大(da)洲(zhou)，使用何種語(yu)言(yan)或者您(nin)(nin)的自動化需(xu)求(qiu)有多大(da)或多小。無(wu)論您(nin)(nin)的身份(fen)是希望(wang)購(gou)買自動化產品以(yi)支持(chi)業(ye)務(wu)目標的*終用戶，還是希望(wang)提升業(ye)務(wu)機(ji)會的原始設備制造商，羅克韋(wei)爾產品都(dou)是您(nin)(nin)可(ke)以(yi)依(yi)賴(lai)的伙伴。

共同協作，提供解決方案

您(nin)十分(fen)清(qing)楚，僅僅購(gou)買產品還遠(yuan)遠(yuan)不(bu)夠。只有合(he)作才能(neng)獲得理想的結果。通過(guo)與羅克韋爾產品合(he)作，您(nin)能(neng)夠充分(fen)利用這家大型技術(shu)和系統工程公司的豐富資源 - 提供專業的自動化產品、應用解決方案(an)和支持服(fu)務。

實現您的目標

我們的解(jie)決方案將助您，在不(bu)斷降低(di)運(yun)營成本的同時(shi)(shi)，以更快的速度將產品和服務(wu)推向市場；在充(chong)分發揮您工廠生產潛力(li)的同時(shi)(shi)，降低(di)能耗、提高工廠正常(chang)運(yun)行時(shi)(shi)間、滿(man)足安全和監管規范(fan)、降低(di)制造(zao)風險。

如何提高(gao)生(sheng)產效率、采購(gou)外包、降(jiang)低成本、縮小規模，這些您(nin)所面(mian)對(dui)的制造及業務的挑(tiao)戰對(dui)任何人而言都是一種(zhong)考驗。因(yin)此，您(nin)不僅需要一個(ge)(ge)自動(dong)(dong)化供應商(shang)為您(nin)提供產品，更(geng)需要一個(ge)(ge)自動(dong)(dong)化合(he)作(zuo)伙伴來為您(nin)解決問題。羅克韋爾產品將是您(nin)正(zheng)確的選(xuan)擇。

差壓變送(song)器(qi)的現場(chang)校準(zhun)方(fang)法

差(cha)壓變送(song)器在工廠有廣(guang)泛的(de)應用(yong)，為保證其正常運行及(ji)準確(que)性，定期檢查、校準是很有必要的(de)。現介(jie)紹一種不用(yong)拆除導壓管就進行現場校準的(de)方法。

一、準備工作：

我們知(zhi)道(dao)差(cha)(cha)壓(ya)(ya)(ya)(ya)(ya)(ya)變送(song)器(qi)(qi)(qi)在應用中是(shi)與(yu)導壓(ya)(ya)(ya)(ya)(ya)(ya)管(guan)相(xiang)連接的，通常的做法(fa)，需要把(ba)導壓(ya)(ya)(ya)(ya)(ya)(ya)管(guan)和(he)差(cha)(cha)壓(ya)(ya)(ya)(ya)(ya)(ya)變送(song)器(qi)(qi)(qi)的接頭拆開，再接入壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)源(yuan)進行校(xiao)(xiao)準(zhun)(zhun)(zhun)。這樣(yang)是(shi)很麻煩的，并且(qie)工作和(he)勞動強(qiang)度大，最擔(dan)心的是(shi)拆裝接頭時把(ba)導壓(ya)(ya)(ya)(ya)(ya)(ya)管(guan)扳(ban)斷或(huo)出(chu)現(xian)泄(xie)漏問題。我們知(zhi)道(dao)不管(guan)什么型(xing)號的差(cha)(cha)壓(ya)(ya)(ya)(ya)(ya)(ya)變送(song)器(qi)(qi)(qi)，其(qi)正、負(fu)(fu)(fu)壓(ya)(ya)(ya)(ya)(ya)(ya)室都有排(pai)(pai)氣(qi)(qi)、排(pai)(pai)液(ye)閥(fa)(fa)或(huo)旋塞(sai)；這就為我們現(xian)場校(xiao)(xiao)準(zhun)(zhun)(zhun)差(cha)(cha)壓(ya)(ya)(ya)(ya)(ya)(ya)變送(song)器(qi)(qi)(qi)提供了方便，也就是(shi)說不用拆除導壓(ya)(ya)(ya)(ya)(ya)(ya)管(guan)就可校(xiao)(xiao)準(zhun)(zhun)(zhun)差(cha)(cha)壓(ya)(ya)(ya)(ya)(ya)(ya)變送(song)器(qi)(qi)(qi)。對差(cha)(cha)壓(ya)(ya)(ya)(ya)(ya)(ya)變送(song)器(qi)(qi)(qi)進行校(xiao)(xiao)準(zhun)(zhun)(zhun)時，先把(ba)三閥(fa)(fa)組的正、負(fu)(fu)(fu)閥(fa)(fa)門(men)關(guan)閉，打開平(ping)衡閥(fa)(fa)門(men)，然(ran)后旋松排(pai)(pai)氣(qi)(qi)、排(pai)(pai)液(ye)閥(fa)(fa)或(huo)旋塞(sai)放空(kong)，然(ran)后用自(zi)制的接頭來代替接正壓(ya)(ya)(ya)(ya)(ya)(ya)室的排(pai)(pai)氣(qi)(qi)、排(pai)(pai)液(ye)閥(fa)(fa)或(huo)旋塞(sai)；而負(fu)(fu)(fu)壓(ya)(ya)(ya)(ya)(ya)(ya)室則保持旋松狀態，使其(qi)通大氣(qi)(qi)。壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)源(yuan)通過膠(jiao)皮管(guan)與(yu)自(zi)制接頭相(xiang)連接，關(guan)閉平(ping)衡閥(fa)(fa)門(men)，并檢查氣(qi)(qi)路密封(feng)情況(kuang)，然(ran)后把(ba)電(dian)流表（電(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)表）、手(shou)操器(qi)(qi)(qi)接入變送(song)器(qi)(qi)(qi)輸(shu)出(chu)電(dian)路中，通電(dian)預熱后開始(shi)校(xiao)(xiao)準(zhun)(zhun)(zhun)。

二、常(chang)規差(cha)壓變(bian)送(song)器的校準(zhun)：

先將阻(zu)尼調(diao)(diao)至(zhi)零(ling)(ling)(ling)(ling)狀態，先調(diao)(diao)零(ling)(ling)(ling)(ling)點(dian)(dian)(dian)，然(ran)(ran)后加(jia)滿度(du)壓力調(diao)(diao)滿量(liang)(liang)程(cheng)，使輸出(chu)(chu)為(wei)20mA，在(zai)(zai)現場(chang)調(diao)(diao)校(xiao)講的(de)是(shi)快，在(zai)(zai)此介紹零(ling)(ling)(ling)(ling)點(dian)(dian)(dian)、量(liang)(liang)程(cheng)的(de)快速調(diao)(diao)校(xiao)法。調(diao)(diao)零(ling)(ling)(ling)(ling)點(dian)(dian)(dian)時(shi)(shi)對滿度(du)幾乎沒有(you)(you)影(ying)(ying)響，但(dan)調(diao)(diao)滿度(du)時(shi)(shi)對零(ling)(ling)(ling)(ling)點(dian)(dian)(dian)有(you)(you)影(ying)(ying)響，在(zai)(zai)不帶(dai)遷(qian)移(yi)時(shi)(shi)其(qi)影(ying)(ying)響約(yue)為(wei)量(liang)(liang)程(cheng)調(diao)(diao)整(zheng)量(liang)(liang)的(de)1／5，即量(liang)(liang)程(cheng)向上調(diao)(diao)整(zheng)1mA，零(ling)(ling)(ling)(ling)點(dian)(dian)(dian)將向上移(yi)動約(yue)0.2mA，反之亦然(ran)(ran)。例(li)如：輸入滿量(liang)(liang)程(cheng)壓力為(wei)100Kpa，該讀(du)數為(wei)19.900mA，調(diao)(diao)量(liang)(liang)程(cheng)電位(wei)器使輸出(chu)(chu)為(wei)19.900+（20.000-19.900）×1.25=20.025mA.量(liang)(liang)程(cheng)增(zeng)加(jia)0.125mA，則零(ling)(ling)(ling)(ling)點(dian)(dian)(dian)增(zeng)加(jia)1／5×0.125=0.025.調(diao)(diao)零(ling)(ling)(ling)(ling)點(dian)(dian)(dian)電位(wei)器使輸出(chu)(chu)為(wei)20.000mA.零(ling)(ling)(ling)(ling)點(dian)(dian)(dian)和滿量(liang)(liang)程(cheng)調(diao)(diao)校(xiao)正常(chang)后，再檢(jian)查中間各刻度(du)，看其(qi)是(shi)否(fou)超差？必要時(shi)(shi)進(jin)行微調(diao)(diao)。然(ran)(ran)后進(jin)行遷(qian)移(yi)、線性、阻(zu)尼的(de)調(diao)(diao)整(zheng)工(gong)作。

三(san)、智能差壓變送器的校準

用(yong)上述(shu)的(de)(de)常規(gui)方法(fa)對(dui)智能變送(song)(song)(song)(song)(song)器(qi)(qi)進(jin)行(xing)校(xiao)(xiao)(xiao)準(zhun)(zhun)(zhun)是不(bu)行(xing)的(de)(de)，因(yin)為(wei)這(zhe)是由HART變送(song)(song)(song)(song)(song)器(qi)(qi)結構原(yuan)理所(suo)(suo)決定(ding)(ding)了。因(yin)為(wei)智能變送(song)(song)(song)(song)(song)器(qi)(qi)在輸(shu)(shu)入(ru)壓(ya)力源和(he)產生(sheng)的(de)(de)4-20mA電流信號(hao)之間，除機械、電路(lu)外，還有(you)微(wei)處(chu)理芯(xin)片對(dui)輸(shu)(shu)入(ru)數(shu)(shu)據的(de)(de)運算工(gong)作(zuo)。因(yin)此調(diao)校(xiao)(xiao)(xiao)與常規(gui)方法(fa)有(you)所(suo)(suo)區別。；V？？？_7@）m7v#F實(shi)(shi)(shi)際(ji)上廠家對(dui)智能變送(song)(song)(song)(song)(song)器(qi)(qi)的(de)(de)校(xiao)(xiao)(xiao)準(zhun)(zhun)(zhun)也是有(you)說明的(de)(de)，如ABB的(de)(de)變送(song)(song)(song)(song)(song)器(qi)(qi)，對(dui)校(xiao)(xiao)(xiao)準(zhun)(zhun)(zhun)就有(you)：“設(she)定(ding)(ding)量(liang)程"、“重定(ding)(ding)量(liang)程"、“微(wei)調(diao)"之分。其中“設(she)定(ding)(ding)量(liang)程"操作(zuo)主要(yao)是通(tong)過(guo)LRV.URV的(de)(de)數(shu)(shu)字(zi)設(she)定(ding)(ding)來完成配(pei)置(zhi)工(gong)作(zuo)，而(er)“重定(ding)(ding)量(liang)程"操作(zuo)則要(yao)求(qiu)將變送(song)(song)(song)(song)(song)器(qi)(qi)連(lian)接到標準(zhun)(zhun)(zhun)壓(ya)力源上，通(tong)過(guo)一系列指(zhi)令(ling)引(yin)導，由變送(song)(song)(song)(song)(song)器(qi)(qi)直接感應(ying)實(shi)(shi)(shi)際(ji)壓(ya)力并對(dui)數(shu)(shu)值進(jin)行(xing)設(she)置(zhi)。而(er)量(liang)程的(de)(de)初始、最終設(she)置(zhi)直接取決于真實(shi)(shi)(shi)的(de)(de)壓(ya)力輸(shu)(shu)入(ru)值。但要(yao)看到盡管變送(song)(song)(song)(song)(song)器(qi)(qi)的(de)(de)模擬(ni)輸(shu)(shu)出(chu)與所(suo)(suo)用(yong)的(de)(de)輸(shu)(shu)入(ru)值關系正確，但過(guo)程值的(de)(de)數(shu)(shu)字(zi)讀數(shu)(shu)顯示的(de)(de)數(shu)(shu)值會(hui)略有(you)不(bu)同，這(zhe)可通(tong)過(guo)微(wei)調(diao)項來進(jin)行(xing)校(xiao)(xiao)(xiao)準(zhun)(zhun)(zhun)。由于各部分既(ji)要(yao)單(dan)獨調(diao)校(xiao)(xiao)(xiao)又必需要(yao)聯調(diao)，因(yin)此實(shi)(shi)(shi)際(ji)校(xiao)(xiao)(xiao)準(zhun)(zhun)(zhun)時(shi)可按(an)以下步驟進(jin)行(xing)：

1.先做(zuo)一次4-20mA微調，用以校正變送器內(nei)部(bu)的(de)D/A轉換器，由于其不涉及傳感部(bu)件，無需外部(bu)壓力信(xin)號源。

2.再做一次全程微調，使4-20mA、數字讀數與(yu)實(shi)際施加的壓力信號相吻合，因(yin)此需要壓力信號源。

3.最后做重定量程(cheng)，通過調(diao)整使模擬輸出(chu)4-20mA與(yu)外(wai)加(jia)的壓力信號源(yuan)相(xiang)吻(wen)合，其(qi)作(zuo)用(yong)與(yu)變(bian)送器外(wai)殼上的調(diao)零（Z）、調(diao)量程(cheng)（R）開關的作(zuo)用(yong)*相(xiang)同。

KIMO差壓變送器天驥教您如何校準壓力變送(song)器(qi)跟差(cha)壓變送(song)器(qi)有什么(me)區別

壓(ya)力變(bian)送器是將實踐的壓(ya)力值轉(zhuan)換成規范的電信號(hao)輸出。

差(cha)壓變送器(qi)是比擬兩個(ge)壓力(li)值(zhi)之(zhi)間的壓力(li)差(cha)， 將這個(ge)差(cha)值(zhi)轉換成規范(fan)信號輸出(實踐(jian)就是做減法，然(ran)后(hou)輸出差(cha))。

差壓(ya)變送器測量(liang)的是兩個(ge)(ge)（容器內）氣體(ti)或液體(ti)的壓(ya)強(qiang)差值 是一個(ge)(ge)相對量(liang)。

壓(ya)力變送器測量的是單個（容器內）氣體(ti)或(huo)液體(ti)的壓(ya)強的大小 是個絕對量。

壓力變送器

一(yi)般(ban)意義上的壓(ya)(ya)力變(bian)送器(qi)(qi)主要由測壓(ya)(ya)元(yuan)件傳(chuan)感(gan)器(qi)(qi)（也(ye)稱作壓(ya)(ya)力傳(chuan)感(gan)器(qi)(qi)）、測量電路(lu)和過程連接(jie)件三(san)部分組(zu)成。它能將測壓(ya)(ya)元(yuan)件傳(chuan)感(gan)器(qi)(qi)感(gan)受到的氣體、液體等(deng)物理壓(ya)(ya)力參數轉(zhuan)變(bian)成標準的電信(xin)號（如4~20mADC等(deng)）， 以供給指示報警儀(yi)、記錄儀(yi)、調節器(qi)(qi)等(deng)二次儀(yi)表(biao)進行(xing)測量、指示和過程調節。

壓(ya)(ya)(ya)(ya)力(li)(li)變(bian)送(song)(song)器(qi)(qi)根(gen)據測量范圍可分(fen)成(cheng)一(yi)般壓(ya)(ya)(ya)(ya)力(li)(li)變(bian)送(song)(song)器(qi)(qi)（0.001MPa～35MPa）和微差(cha)壓(ya)(ya)(ya)(ya)變(bian)送(song)(song)器(qi)(qi)（0～1.5kPa），負壓(ya)(ya)(ya)(ya)變(bian)送(song)(song)器(qi)(qi)三(san)種；從精(jing)(jing)度(du)(du)角(jiao)度(du)(du)來分(fen)類(lei)的(de)(de)話，因為(wei)我(wo)國國標(biao)的(de)(de)精(jing)(jing)度(du)(du)就為(wei)0.5%.　所以(yi)(yi)近年來又可以(yi)(yi)分(fen)為(wei)高精(jing)(jing)度(du)(du)壓(ya)(ya)(ya)(ya)力(li)(li)變(bian)送(song)(song)器(qi)(qi)（0.1%或0.2%或0.075%）和一(yi)般壓(ya)(ya)(ya)(ya)力(li)(li)變(bian)送(song)(song)器(qi)(qi)（0.5%）2.差(cha)壓(ya)(ya)(ya)(ya)變(bian)送(song)(song)器(qi)(qi)

差(cha)(cha)(cha)(cha)壓(ya)(ya)(ya)(ya)(ya)變(bian)(bian)(bian)送(song)器(qi)(qi)是測量(liang)(liang)變(bian)(bian)(bian)送(song)器(qi)(qi)兩端壓(ya)(ya)(ya)(ya)(ya)力(li)(li)之差(cha)(cha)(cha)(cha)的(de)變(bian)(bian)(bian)送(song)器(qi)(qi)。所測量(liang)(liang)的(de)結果(guo)是壓(ya)(ya)(ya)(ya)(ya)力(li)(li)差(cha)(cha)(cha)(cha)，差(cha)(cha)(cha)(cha)壓(ya)(ya)(ya)(ya)(ya)變(bian)(bian)(bian)送(song)器(qi)(qi)與一(yi)般(ban)的(de)壓(ya)(ya)(ya)(ya)(ya)力(li)(li)變(bian)(bian)(bian)送(song)器(qi)(qi)不同的(de)是它們均有2個壓(ya)(ya)(ya)(ya)(ya)力(li)(li)接口， 差(cha)(cha)(cha)(cha)壓(ya)(ya)(ya)(ya)(ya)變(bian)(bian)(bian)送(song)器(qi)(qi)一(yi)般(ban)分為正(zheng)壓(ya)(ya)(ya)(ya)(ya)端和負壓(ya)(ya)(ya)(ya)(ya)端，一(yi)般(ban)情況下， 差(cha)(cha)(cha)(cha)壓(ya)(ya)(ya)(ya)(ya)變(bian)(bian)(bian)送(song)器(qi)(qi)正(zheng)壓(ya)(ya)(ya)(ya)(ya)端的(de)壓(ya)(ya)(ya)(ya)(ya)力(li)(li)應大于負壓(ya)(ya)(ya)(ya)(ya)段(duan)壓(ya)(ya)(ya)(ya)(ya)力(li)(li)才能測量(liang)(liang)。測量(liang)(liang)介質正(zheng)負兩端的(de)壓(ya)(ya)(ya)(ya)(ya)力(li)(li)差(cha)(cha)(cha)(cha)，轉化成(cheng)可以反應壓(ya)(ya)(ya)(ya)(ya)力(li)(li)差(cha)(cha)(cha)(cha)的(de)標準電(dian)流(liu)信號（4-20mA）。

差(cha)壓變送(song)器(qi)用于測量液(ye)體(ti)、氣體(ti)和(he)蒸汽(qi)的(de)液(ye)位、密度壓力，然(ran)后將(jiang)其轉變成4- 20mA DC的(de)電(dian)流(liu)信號輸出(chu)。JT-3051DP也(ye)可以通(tong)過(guo)BRAIN手操器(qi)或CENTUM CS/μXL或HART 275手操器(qi)相互通(tong)訊，通(tong)過(guo)它(ta)們(men)進行(xing)設定和(he)監控等。