產品中心
PRODUCTS CENTERESC810在(zai)線電(dian)(dian)(dian)導(dao)(dao)率(lv)(lv)測量(liang)儀是以數字表(biao)示(shi)溶(rong)液(ye)傳導(dao)(dao)電(dian)(dian)(dian)流的能力。水(shui)(shui)(shui)的電(dian)(dian)(dian)導(dao)(dao)率(lv)(lv)與其所含無機酸、堿、鹽的量(liang)有(you)一定的關(guan)系,當(dang)它們的濃度(du)較低(di)時,電(dian)(dian)(dian)導(dao)(dao)率(lv)(lv)隨著濃度(du)的增大而(er)增加(jia),因此,該指標常用(yong)于推測水(shui)(shui)(shui)中離子的總濃度(du)或含鹽量(liang)。電(dian)(dian)(dian)導(dao)(dao)率(lv)(lv)的物(wu)理(li)意義是表(biao)示(shi)物(wu)質導(dao)(dao)電(dian)(dian)(dian)的性能。電(dian)(dian)(dian)導(dao)(dao)率(lv)(lv)越大則導(dao)(dao)電(dian)(dian)(dian)性能越強,反(fan)之越小。可廣泛應用(yong)于火電(dian)(dian)(dian)、化工化肥、冶金、環保(bao)、制藥、生(sheng)化、食品和自(zi)來水(shui)(shui)(shui)等溶(rong)液(ye)中電(dian)(dian)(dian)導(dao)(dao)率(lv)(lv)值的連續監測。
ESC810在線電導率(lv)
產品(pin)概述
電(dian)(dian)(dian)導(dao)(dao)(dao)率(lv)是以數字表示溶液(ye)(ye)傳(chuan)導(dao)(dao)(dao)電(dian)(dian)(dian)流的(de)能(neng)力。水(shui)的(de)電(dian)(dian)(dian)導(dao)(dao)(dao)率(lv)與其所含(han)無機酸、堿(jian)、鹽的(de)量有一(yi)定(ding)的(de)關系,當(dang)它(ta)們(men)的(de)濃度較(jiao)低時,電(dian)(dian)(dian)導(dao)(dao)(dao)率(lv)隨著濃度的(de)增大(da)而增加,因(yin)此,該指標常用(yong)于推測水(shui)中離(li)子的(de)總濃度或(huo)含(han)鹽量。電(dian)(dian)(dian)導(dao)(dao)(dao)率(lv)的(de)物(wu)理(li)意義(yi)是表示物(wu)質導(dao)(dao)(dao)電(dian)(dian)(dian)的(de)性能(neng)。電(dian)(dian)(dian)導(dao)(dao)(dao)率(lv)越大(da)則導(dao)(dao)(dao)電(dian)(dian)(dian)性能(neng)越強(qiang),反之越小。可廣泛應用(yong)于火電(dian)(dian)(dian)、化工化肥、冶(ye)金、環(huan)保(bao)、制藥、生化、食品和(he)自來水(shui)等溶液(ye)(ye)中電(dian)(dian)(dian)導(dao)(dao)(dao)率(lv)值的(de)連(lian)續(xu)監測。
技術規(gui)格(ge)
l 溫(wen)度范圍:0~60℃
l 準 確 度(du):±1.0%FS
l 重 復(fu) 性:±1.0%FS
l 穩 定 性:±1.0%FS
l 環境溫度(du):-20℃~55℃
l 相對濕度:≤85%
l 模擬輸出:4~20mA、zui大負載(zai)750Ω
l 數字(zi)輸出:RS485(ModBus協(xie)議(yi))
l 開關輸(shu)出(chu)(chu):繼電器輸(shu)出(chu)(chu)(雙路(lu)可(ke)選);容量(liang)220VAC/5A
l 材(cai) 質:ABS
l 防(fang)護等級:IP65
l 供電(dian)電(dian)源:AC220V±10%
l 電源頻率:(50±5)Hz
l 響應時間:7秒
l 電極常數: 0.01(測量范圍0-2μs/cm或0-20μs/cm)
l 0.1(測量范圍0-200μs/cm)
l 1.0(測量(liang)范圍(wei)0-2000μs/cm)
l 10.0(測(ce)量(liang)范(fan)圍(wei)0-20000μs/cm)
l 溫度范(fan)圍:0~60℃
l 溫度補償(chang):PT1000
l 耐 壓(ya):0.6Mpa
l 連接方式:1/2"或3/4NPT螺紋(wen)
l 材 質:316L或塑(su)殼
l 安(an)裝方式(shi)(shi):流通式(shi)(shi)、支架浸入式(shi)(shi)
l 防(fang)護(hu)等級:IP68
l 線纜長度:10米(mi)標配(可延長至20米(mi))
產品(pin)特(te)點
1. 全智(zhi)能、多功能、測量性(xing)能高,環(huan)境適應(ying)性(xing)強;
2. 多參數同時(shi)顯示:電導率(lv)值、電流值、時(shi)間(jian);
3. 適(shi)配多種常數類型測(ce)量電極;
4. 出(chu)廠標(biao)準配置中文(wen)界面,語(yu)言(yan)化菜單(dan),可中英切(qie)換(huan)
5. 可(ke)進行電(dian)導率和溫度的測量、4~20mA變(bian)送輸(shu)出、繼電(dian)器高、低報(bao)警(jing)控制輸(shu)出;
6. RS485通信輸出等各種變(bian)量輸出,系統智能控(kong)制(zhi);
7. 高精度自動溫度補償系(xi)統,可自由調整電導率溫度補償系(xi)數
8. 雙(shuang)路繼電(dian)器(qi),可(ke)對電(dian)導率(lv)和溫度分(fen)別進行控制,遲(chi)滯(zhi)量可(ke)自由調整
9. 高性能(neng)CPU,良好的電(dian)磁兼容性能(neng)
10. 具(ju)有一鍵恢(hui)復出廠參數功能
測量原理(li)
電(dian)(dian)(dian)導(dao)(G)是(shi)電(dian)(dian)(dian)阻(zu)(zu)(R)的倒數(shu),電(dian)(dian)(dian)導(dao)率(lv)(lv)(K)是(shi)電(dian)(dian)(dian)阻(zu)(zu)率(lv)(lv)(ρ)的倒數(shu)。因此當(dang)電(dian)(dian)(dian)極(ji)(通常(chang)為鉑電(dian)(dian)(dian)極(ji)或(huo)(huo)鉑黑電(dian)(dian)(dian)極(ji))插入溶液(ye)中,電(dian)(dian)(dian)極(ji)內有(you)相互平(ping)行且(qie)距離是(shi)固定(ding)(ding)值L的兩塊極(ji)板(或(huo)(huo)圓柱電(dian)(dian)(dian)極(ji)),可(ke)以測(ce)出(chu)兩電(dian)(dian)(dian)極(ji)間(jian)的電(dian)(dian)(dian)阻(zu)(zu)R。根據歐(ou)姆定(ding)(ding)律,溫度一定(ding)(ding)時(shi),這個電(dian)(dian)(dian)阻(zu)(zu)值與兩電(dian)(dian)(dian)極(ji)間(jian)距L(cm)正比(bi),與電(dian)(dian)(dian)極(ji)的截面積A(cm²)反(fan)比(bi),即R =ρ×(L/A);其(qi)中ρ為電(dian)(dian)(dian)阻(zu)(zu)率(lv)(lv),是(shi)長1cm,截面積為1cm²導(dao)體的電(dian)(dian)(dian)阻(zu)(zu),其(qi)大小決定(ding)(ding)于物質的本(ben)性。據上式,導(dao)體的電(dian)(dian)(dian)導(dao)(G)可(ke)表示成下(xia)式:G =1/R=(1/ρ)×(A/L)=K×(1/J);其(qi)中,K=1/ρ稱為電(dian)(dian)(dian)導(dao)率(lv)(lv),J =L/A稱為電(dian)(dian)(dian)極(ji)常(chang)數(shu);電(dian)(dian)(dian)解質溶液(ye)電(dian)(dian)(dian)導(dao)率(lv)(lv)指相距1cm的兩平(ping)行電(dian)(dian)(dian)極(ji)間(jian)充以1cm³溶液(ye)時(shi)所具(ju)有(you)的電(dian)(dian)(dian)導(dao)。所以當(dang)已(yi)知電(dian)(dian)(dian)極(ji)常(chang)數(shu)(J),并測(ce)出(chu)溶液(ye)電(dian)(dian)(dian)阻(zu)(zu)(R)或(huo)(huo)電(dian)(dian)(dian)導(dao)(G)時(shi),即可(ke)求(qiu)出(chu)電(dian)(dian)(dian)導(dao)率(lv)(lv)。
電極的(de)選擇與(yu)使用
1. 根據(ju)被測(ce)(ce)水樣電(dian)(dian)導率的(de)(de)(de)大小范圍,選擇常(chang)數合適的(de)(de)(de)電(dian)(dian)極(ji)是準(zhun)確測(ce)(ce)量(liang)的(de)(de)(de)關鍵。特(te)別是對純(chun)水(<3μS/cm)和超純(chun)水(<1μS/cm)的(de)(de)(de)測(ce)(ce)量(liang),應用(yong)0.01的(de)(de)(de)電(dian)(dian)極(ji),必要時還要加上密閉測(ce)(ce)量(liang)槽,才能(neng)作到準(zhun)確的(de)(de)(de)測(ce)(ce)量(liang),否則將產生(sheng)較大的(de)(de)(de)誤(wu)差。
2. 選擇(ze)電(dian)(dian)極(ji)的(de)基本原則:根(gen)據被測(ce)水樣(yang)電(dian)(dian)導(dao)率的(de)大小(xiao)范圍,參(can)照下(xia)表選擇(ze)常數(shu)合(he)適的(de)電(dian)(dian)極(ji)。在選擇(ze)電(dian)(dian)極(ji)時,zui易出現的(de)錯誤是“選擇(ze)大常數(shu)的(de)電(dian)(dian)極(ji)測(ce)低電(dian)(dian)導(dao)”。如選1.0的(de)電(dian)(dian)極(ji)測(ce)<3μS/cm的(de)水樣(yang),這不可能得(de)到準(zhun)確的(de)值。因為低電(dian)(dian)導(dao)介質的(de)導(dao)電(dian)(dian)性(xing)很差(cha)(cha),若再用大常數(shu)的(de)電(dian)(dian)極(ji)去(qu)測(ce)量,則只會得(de)到更(geng)微弱且不穩定的(de)電(dian)(dian)信號,勢必(bi)大幅度增加測(ce)量誤差(cha)(cha)。
3. 儀表中(zhong)設(she)置的(de)電(dian)(dian)極(ji)(ji)系數(shu)必須與電(dian)(dian)極(ji)(ji)上(shang)所標(biao)的(de)系數(shu)*。如所配電(dian)(dian)極(ji)(ji)上(shang)標(biao)的(de)電(dian)(dian)極(ji)(ji)系數(shu)為(wei)0.102,則(ze)儀表里電(dian)(dian)極(ji)(ji)系數(shu)必須設(she)置為(wei)1.02*0.1。
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