技術文章
Technical articlesKIMO凱茂差壓變送器的輸入的什么信號熱(re)電(dian)阻溫度變(bian)(bian)送器是(shi)在熱(re)電(dian)阻傳(chuan)感器的(de)基(ji)礎(chu)上加裝了(le)溫度變(bian)(bian)送器,輸(shu)入信號是(shi)電(dian)阻信號,以電(dian)阻值(zhi)的(de)大小變(bian)(bian)化(hua)(hua)來反應出溫度的(de)變(bian)(bian)化(hua)(hua)。
輸出信(xin)號一般(ban)為(wei)0-24ma,和0-12v等
具體的你要看(kan)你的二次儀表支持什么(me)信號了。
差(cha)壓變送(song)器流量的計算方法
有(you)詳細計算公式和步驟如下:
1、一般來說流(liu)量和差壓是開跟關(guan)系(xi),即F*F=K*△P
2、則K=F×F/△P=200*200/25=1600
3、流量(liang)為80m3/h時:△P1=F1*F1/K=80*80/1600=4KPa4、電流輸出(chu)為(20mA-4mA)×4/25+4=6.56mA
5、流量為100m3/h時:△P2=F2*F2/K=100*100/1600=6.25KPa6、電(dian)流輸出為(20mA-4mA)×6.25/25+4=8mA
差(cha)壓(ya)(ya)(ya)(壓(ya)(ya)(ya)力(li)) 變(bian)(bian)送器是(shi)一種典型的(de)自平衡檢(jian)測儀表,它(ta)利用負反(fan)饋的(de)工作原理克服(fu)元件材料、加(jia)工工藝等不利因素的(de)影響。差(cha)壓(ya)(ya)(ya)變(bian)(bian)送器用于測量液(ye)體(ti)、氣體(ti)和(he)蒸(zheng)汽的(de)液(ye)位(wei)、密度和(he)壓(ya)(ya)(ya)力(li),然后將其轉變(bian)(bian)成4- 20mA DC的(de)電流(liu)信號(hao)輸出。JT-3051DP也可以通過BRAIN手操器或CENTUM CS/μXL或HART 275手操器相(xiang)互通訊,通過它(ta)們(men)進行設定和(he)監控(kong)等。
差(cha)壓變送器的工(gong)作原理是什么
變(bian)(bian)(bian)(bian)(bian)(bian)(bian)送器(qi)主(zhu)要有(you)檢(jian)(jian)測(ce)部分和信號轉換及放大處理部分組(zu)(zu)成(cheng)(cheng)。檢(jian)(jian)測(ce)部分由(you)(you)檢(jian)(jian)測(ce)膜(mo)片和兩(liang)側固(gu)定弧(hu)(hu)(hu)形(xing)(xing)板(ban)組(zu)(zu)成(cheng)(cheng),檢(jian)(jian)測(ce)膜(mo)片在壓(ya)差的(de)(de)作用下(xia)可(ke)(ke)軸向(xiang)移(yi)(yi)(yi)(yi)(yi)動(dong),形(xing)(xing)成(cheng)(cheng)可(ke)(ke)移(yi)(yi)(yi)(yi)(yi)動(dong)電(dian)容(rong)(rong)(rong)極板(ban),并和固(gu)定弧(hu)(hu)(hu)形(xing)(xing)板(ban)組(zu)(zu)成(cheng)(cheng)兩(liang)個可(ke)(ke)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)電(dian)容(rong)(rong)(rong)器(qi)C1和C2,檢(jian)(jian)測(ce)前(qian),高、低(di)壓(ya)室壓(ya)力平衡,P1 =P2;按結構要求,組(zu)(zu)成(cheng)(cheng)兩(liang)可(ke)(ke)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)電(dian)容(rong)(rong)(rong)的(de)(de)固(gu)定弧(hu)(hu)(hu)形(xing)(xing)極板(ban)和檢(jian)(jian)測(ce)膜(mo)片對(dui)(dui)稱(cheng),極間距相等,C1 =C2。當被測(ce)壓(ya)力P1和P2分別由(you)(you)導入管進入高、低(di)壓(ya)室時,由(you)(you)于(yu)P1 >P2隔(ge)離膜(mo)片中心將(jiang)發(fa)生(sheng)位移(yi)(yi)(yi)(yi)(yi),壓(ya)迫(po)電(dian)解(jie)(jie)質(zhi)使(shi)高壓(ya)側容(rong)(rong)(rong)積變(bian)(bian)(bian)(bian)(bian)(bian)(bian)小。當電(dian)解(jie)(jie)質(zhi)為不可(ke)(ke)壓(ya)縮體時,其容(rong)(rong)(rong)積變(bian)(bian)(bian)(bian)(bian)(bian)(bian)化(hua)量(liang)將(jiang)引起檢(jian)(jian)測(ce)膜(mo)片中心向(xiang)低(di)壓(ya)側位移(yi)(yi)(yi)(yi)(yi),此(ci)位移(yi)(yi)(yi)(yi)(yi)量(liang)和隔(ge)離膜(mo)片中心位移(yi)(yi)(yi)(yi)(yi)量(liang)相等。根據電(dian)工學,當組(zu)(zu)成(cheng)(cheng)電(dian)容(rong)(rong)(rong)的(de)(de)兩(liang)極板(ban)極間距發(fa)生(sheng)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)化(hua)時,其電(dian)容(rong)(rong)(rong)量(liang)也將(jiang)發(fa)生(sheng)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)化(hua),即從(cong)C1=C2變(bian)(bian)(bian)(bian)(bian)(bian)(bian)為C1≠C2。由(you)(you)電(dian)氣原理圖可(ke)(ke)知(zhi),未發(fa)生(sheng)位移(yi)(yi)(yi)(yi)(yi)時,I1=I2=0;ι1+ι2=ιc;發(fa)生(sheng)位移(yi)(yi)(yi)(yi)(yi)后,由(you)(you)于(yu)相對(dui)(dui)極間距發(fa)生(sheng)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)化(hua),各(ge)極板(ban)上的(de)(de)積聚(ju)電(dian)荷量(liang)也發(fa)生(sheng)變(bian)(bian)(bian)(bian)(bian)(bian)(bian)化(hua),形(xing)(xing)成(cheng)(cheng)電(dian)荷位移(yi)(yi)(yi)(yi)(yi),此(ci)時反映出(chu)I1≠ I2,兩(liang)者之間將(jiang)產生(sheng)電(dian)流(liu)差,若檢(jian)(jian)測(ce)出(chu)其值大小以及和壓(ya)差的(de)(de)關(guan)系,即可(ke)(ke)求取(qu)流(liu)量(liang)。
KIMO凱茂差壓變送器的輸入的什么信號電容(rong)式差壓(ya)(ya)變送器(qi)(qi)是20世紀80年代研制(zhi)開發的(de)新型(xing)差壓(ya)(ya)變送器(qi)(qi),它利用單晶硅諧振傳感器(qi)(qi),采(cai)用微(wei)電子(zi)表(biao)面加工技術,除了保證±0.2%的(de)測量精度外(wai),還(huan)可實現抵制(zhi)靜(jing)壓(ya)(ya)、溫飄對其影響。由于配(pei)備了低(di)噪聲調(diao)制(zhi)解調(diao)器(qi)(qi)和開放(fang)式通訊協議,目前的(de)電容(rong)式差壓(ya)(ya)變送器(qi)(qi)可實現數字無損耗信(xin)號傳輸。
壓(ya)力變(bian)送器(qi)與差壓(ya)變(bian)送器(qi)的最根本區別
壓力變送器是將實踐的壓力值轉換成規范的電信(xin)號(hao)輸(shu)出。
差(cha)壓變送器是(shi)比擬兩個壓力值之間的壓力差(cha), 將這個差(cha)值轉換成規范信號輸出(chu)(實踐就是(shi)做(zuo)減(jian)法(fa),然后輸出(chu)差(cha))。
差壓(ya)變(bian)送(song)器測量的是兩(liang)個(容器內)氣(qi)體(ti)或液(ye)體(ti)的壓(ya)強差值 是一個相對量。
壓力變(bian)送(song)器(qi)測量的是單個(ge)(容器(qi)內(nei))氣(qi)體或液體的壓強的大小 是個(ge)絕(jue)對(dui)量。
差壓變送器工作原理
差壓(ya)變送器工作原理:被測(ce)介質的兩(liang)種壓(ya)力通入高、低兩(liang)壓(ya)力室,作用在δ元件的兩(liang)側(ce)隔(ge)離膜片上(shang),通過隔(ge)離片和元件內的填充液傳送到測(ce)量(liang)膜片兩(liang)側(ce)。測(ce)量(liang)膜片與兩(liang)側(ce)絕(jue)緣片上(shang)的電(dian)極各組成(cheng)一個電(dian)容器。
當兩側壓(ya)(ya)力(li)不一致時,致使測量(liang)膜片產生(sheng)位移,其位移量(liang)和壓(ya)(ya)力(li)差成(cheng)正(zheng)比(bi),故兩側電容量(liang)就不等(deng),通過振蕩和解調環節,轉換成(cheng)與壓(ya)(ya)力(li)成(cheng)正(zheng)比(bi)的信號。壓(ya)(ya)力(li)變送(song)器和絕對壓(ya)(ya)力(li)變送(song)器的工作原理和差壓(ya)(ya)變送(song)器相同,所不同的是低壓(ya)(ya)室壓(ya)(ya)力(li)是大氣(qi)壓(ya)(ya)或真空。
A/D轉(zhuan)換(huan)器(qi)(qi)將(jiang)解調器(qi)(qi)的電流(liu)轉(zhuan)換(huan)成數字(zi)信號,其值被微處(chu)理(li)器(qi)(qi)用(yong)來判定輸入壓(ya)力值。微處(chu)理(li)器(qi)(qi)控制變送器(qi)(qi)的工(gong)作。另外,它進行傳感器(qi)(qi)線(xian)性化。重置測量范圍。工(gong)程單位換(huan)算、阻尼(ni)、開方,傳感器(qi)(qi)微調等運算,以及診斷和數字(zi)通信。
差壓變送器的特點:
差壓變送器用于(yu)測量液(ye)體(ti)、氣體(ti)和蒸汽的(de)(de)液(ye)位、密度和壓力,然后將(jiang)其轉變成4- 20mA DC的(de)(de)電(dian)流信(xin)號輸出。