一、多功能電力儀表多少錢一臺
多功能電力儀表是是一種具有可編程測量、顯示、數字通訊和電能脈沖變送輸出等多功能智能儀表,廣泛應用于變電站自動化、配電自動化、智能建筑、企業內部的電能測量、管理、考核,那么多功能電力儀表的價格是(shi)多(duo)少錢一臺呢?
市(shi)面上(shang)多(duo)功能電力儀表(biao)的價格主要受到其生(sheng)產廠家、型(xing)號規格、功能、硬件配置等多(duo)方面因素的影(ying)響(xiang),從一百多(duo)元一臺到三(san)五(wu)百元一臺都(dou)有(you),貴的也有(you)上(shang)千元一臺的。(以上(shang)價格來源網(wang)絡(luo),僅(jin)供(gong)參考(kao))
二、選購多功能電力儀表要考慮哪些因素
多功(gong)能電力儀表在電力領域有著廣(guang)泛的(de)(de)應用,在選(xuan)購多功(gong)能電力儀表時,需要綜合考慮多方面的(de)(de)因(yin)素,具(ju)體包括:
1、儀表尺寸
即儀(yi)表(biao)的(de)體(ti)(ti)(ti)積大小,這是個很基本的(de)問題。多功(gong)能(neng)(neng)電力儀(yi)表(biao)要裝在柜體(ti)(ti)(ti)上,所以(yi)要考慮整體(ti)(ti)(ti)的(de)協調性(xing),過大了可(ke)能(neng)(neng)裝不下,過小了看(kan)不清顯示(shi)數字,另外,體(ti)(ti)(ti)積大的(de)儀(yi)表(biao)一般功(gong)能(neng)(neng)擴充(chong)性(xing)較強,同樣(yang)功(gong)能(neng)(neng)價格可(ke)能(neng)(neng)會貴,體(ti)(ti)(ti)積小的(de)儀(yi)表(biao)可(ke)能(neng)(neng)功(gong)能(neng)(neng)擴充(chong)性(xing)較差(cha)。
2、輸入信號
指直(zhi)接(jie)輸入(ru)(ru)(ru)儀(yi)(yi)表(biao)(biao)(biao)的(de)(de)(de)測量信(xin)(xin)(xin)(xin)號(hao)(hao),有些(xie)工業信(xin)(xin)(xin)(xin)號(hao)(hao)是(shi)(shi)(shi)直(zhi)接(jie)接(jie)入(ru)(ru)(ru)儀(yi)(yi)表(biao)(biao)(biao)測量的(de)(de)(de),有些(xie)信(xin)(xin)(xin)(xin)號(hao)(hao)是(shi)(shi)(shi)經過轉化后接(jie)入(ru)(ru)(ru)儀(yi)(yi)表(biao)(biao)(biao)的(de)(de)(de),必須弄清(qing)(qing)楚測量信(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)性質,否(fou)則買去的(de)(de)(de)儀(yi)(yi)表(biao)(biao)(biao)不(bu)能用,甚(shen)至(zhi)損壞儀(yi)(yi)表(biao)(biao)(biao)及原有設備(bei)。要弄清(qing)(qing)信(xin)(xin)(xin)(xin)號(hao)(hao)類(lei)型:電(dian)流(liu)(liu)還是(shi)(shi)(shi)電(dian)壓,交流(liu)(liu)還是(shi)(shi)(shi)直(zhi)流(liu)(liu),是(shi)(shi)(shi)脈沖(chong)信(xin)(xin)(xin)(xin)號(hao)(hao)還是(shi)(shi)(shi)線性信(xin)(xin)(xin)(xin)號(hao)(hao)等等,還要弄清(qing)(qing)信(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)大小(xiao)。儀(yi)(yi)表(biao)(biao)(biao)的(de)(de)(de)名(ming)(ming)稱與輸入(ru)(ru)(ru)信(xin)(xin)(xin)(xin)號(hao)(hao)不(bu)是(shi)(shi)(shi)同一概念,舉幾個例子(zi):輸入(ru)(ru)(ru)信(xin)(xin)(xin)(xin)號(hao)(hao)是(shi)(shi)(shi)0-75mVdc的(de)(de)(de)電(dian)流(liu)(liu)表(biao)(biao)(biao)(名(ming)(ming)稱是(shi)(shi)(shi)電(dian)流(liu)(liu)表(biao)(biao)(biao),輸入(ru)(ru)(ru)信(xin)(xin)(xin)(xin)號(hao)(hao)卻是(shi)(shi)(shi)電(dian)壓信(xin)(xin)(xin)(xin)號(hao)(hao),因為電(dian)流(liu)(liu)經過分流(liu)(liu)器(qi)取得電(dian)壓信(xin)(xin)(xin)(xin)號(hao)(hao));輸入(ru)(ru)(ru)信(xin)(xin)(xin)(xin)號(hao)(hao)是(shi)(shi)(shi)0-10Vdc的(de)(de)(de)轉速表(biao)(biao)(biao)(名(ming)(ming)稱是(shi)(shi)(shi)轉速表(biao)(biao)(biao),輸入(ru)(ru)(ru)信(xin)(xin)(xin)(xin)號(hao)(hao)卻是(shi)(shi)(shi)電(dian)壓表(biao)(biao)(biao),因為變頻器(qi)將轉速信(xin)(xin)(xin)(xin)號(hao)(hao)轉化成電(dian)壓信(xin)(xin)(xin)(xin)號(hao)(hao))。
3、顯示位數
這直接關系到(dao)多(duo)功(gong)(gong)(gong)能(neng)(neng)電(dian)(dian)力儀(yi)表(biao)(biao)的測(ce)量精(jing)度,一般(ban)來講,顯(xian)示(shi)位數越(yue)高,測(ce)量更精(jing)確,價(jia)格(ge)也越(yue)貴,主要有以(yi)(yi)下(xia)幾(ji)種:兩位(99,特殊);三(san)位(999,極少(shao));三(san)位半(ban)(1999,普通多(duo)功(gong)(gong)(gong)能(neng)(neng)電(dian)(dian)力儀(yi)表(biao)(biao)占主流);四(si)位(9999,智能(neng)(neng)多(duo)功(gong)(gong)(gong)能(neng)(neng)電(dian)(dian)力儀(yi)表(biao)(biao)占主流);四(si)位半(ban)(19999);四(si)又(you)四(si)分之(zhi)三(san)(3999);五位及五位以(yi)(yi)上(常見于計(ji)數器、累(lei)計(ji)表(biao)(biao)和高端儀(yi)表(biao)(biao)),用戶可以(yi)(yi)根據(ju)測(ce)量精(jing)度要求來選(xuan)擇幾(ji)位的多(duo)功(gong)(gong)(gong)能(neng)(neng)電(dian)(dian)力儀(yi)表(biao)(biao)。
4、工作電源
所(suo)有(you)多(duo)功(gong)能(neng)電(dian)力(li)儀表都需要(yao)工作電(dian)源,多(duo)功(gong)能(neng)電(dian)力(li)儀表的工作電(dian)源主要(yao)有(you):220Vac;110/220Vac;85-265VAC/CD開關電(dian)源,24Vdc(一般要(yao)訂(ding)制),5Vdc(小面板表)。
5、儀表功能
多功能電力儀表的(de)功(gong)(gong)(gong)能(neng)一般都(dou)是模塊(kuai)化的(de),可(ke)選(xuan)擇(ze)的(de),儀(yi)表(biao)價格也會隨功(gong)(gong)(gong)能(neng)不一樣而有(you)所差異,多功(gong)(gong)(gong)能(neng)電力儀(yi)表(biao)除了(le)基本的(de)功(gong)(gong)(gong)能(neng)外,通(tong)(tong)常還有(you)以下可(ke)選(xuan)功(gong)(gong)(gong)能(neng):報警功(gong)(gong)(gong)能(neng)及(ji)(ji)報警輸(shu)(shu)(shu)(shu)出(chu)的(de)組數(即(ji)繼電器動作輸(shu)(shu)(shu)(shu)出(chu)),饋電電源輸(shu)(shu)(shu)(shu)出(chu)及(ji)(ji)輸(shu)(shu)(shu)(shu)出(chu)電壓的(de)大小及(ji)(ji)功(gong)(gong)(gong)率,變(bian)送(song)輸(shu)(shu)(shu)(shu)出(chu)及(ji)(ji)變(bian)送(song)輸(shu)(shu)(shu)(shu)出(chu)的(de)類型(4-20mA還是0-10V等),通(tong)(tong)訊輸(shu)(shu)(shu)(shu)出(chu)及(ji)(ji)通(tong)(tong)訊方(fang)式(shi)和(he)協議(RS485還是RS232,是Modbus還是其(qi)他協議),對于調節控制儀(yi)表(biao),可(ke)選(xuan)功(gong)(gong)(gong)能(neng)就更多,具體要參照廠家的(de)選(xuan)型譜選(xuan)出(chu)一個規(gui)范的(de)型號,并與廠家溝通(tong)(tong)并確認無誤(wu)后才(cai)可(ke)以訂貨。
6、特殊要求
若用戶有特(te)殊要求就(jiu)應提出來(lai),讓廠家確認能否滿足要求,千(qian)萬不能想當然,比如:IP防護等級、高溫工(gong)作場(chang)合(he)、強(qiang)干(gan)擾場(chang)合(he)、特(te)殊信號(hao)場(chang)合(he)、特(te)殊工(gong)作方式(shi)等等。