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電極式酸堿濃度計工作原理

手機頁面二維碼 2021/02/17     瀏覽次數: 2071

酸堿濃度計

酸(suan)堿(jian)濃(nong)(nong)(nong)度(du)(du)(du)計通過測(ce)量溶(rong)(rong)液(ye)(ye)(ye)電(dian)(dian)導(dao)(dao)(dao)率(lv)的(de)(de)方(fang)法間接地計算出(chu)該溶(rong)(rong)液(ye)(ye)(ye)的(de)(de)濃(nong)(nong)(nong)度(du)(du)(du),已知在某一(yi)恒定溫(wen)度(du)(du)(du)時,低濃(nong)(nong)(nong)度(du)(du)(du)電(dian)(dian)解(jie)質(zhi)的(de)(de)電(dian)(dian)導(dao)(dao)(dao)率(lv)與該溶(rong)(rong)液(ye)(ye)(ye)的(de)(de)濃(nong)(nong)(nong)度(du)(du)(du)成(cheng)(cheng)對(dui)應關系(xi),濃(nong)(nong)(nong)度(du)(du)(du)不變而溶(rong)(rong)液(ye)(ye)(ye)溫(wen)度(du)(du)(du)發生(sheng)變化時,電(dian)(dian)導(dao)(dao)(dao)率(lv)也(ye)發生(sheng)變化,即該溶(rong)(rong)液(ye)(ye)(ye)的(de)(de)濃(nong)(nong)(nong)度(du)(du)(du)是電(dian)(dian)導(dao)(dao)(dao)率(lv)和溫(wen)度(du)(du)(du)的(de)(de)函數。如能(neng)(neng)(neng)測(ce)出(chu)溶(rong)(rong)液(ye)(ye)(ye)的(de)(de)溫(wen)度(du)(du)(du)并按 前述(shu)對(dui)應關系(xi)將(jiang)其修(xiu)正(zheng)成(cheng)(cheng)標準溫(wen)度(du)(du)(du)下的(de)(de)電(dian)(dian)導(dao)(dao)(dao)率(lv),就可(ke)直接換算成(cheng)(cheng)該溶(rong)(rong)液(ye)(ye)(ye)的(de)(de)濃(nong)(nong)(nong)度(du)(du)(du).需強調(diao)的(de)(de)是,該溶(rong)(rong)液(ye)(ye)(ye)的(de)(de)濃(nong)(nong)(nong)度(du)(du)(du)是水中(zhong)一(yi)切導(dao)(dao)(dao)電(dian)(dian)離子導(dao)(dao)(dao)電(dian)(dian)能(neng)(neng)(neng)力(li)的(de)(de)總和,如果(guo)水中(zhong)有(you)兩(liang)(liang)種或兩(liang)(liang)種以上(shang)(shang) 導(dao)(dao)(dao)電(dian)(dian)組合(he)成(cheng)(cheng)份(fen),能(neng)(neng)(neng)測(ce)得(de)上(shang)(shang)述(shu)濃(nong)(nong)(nong)度(du)(du)(du)一(yi)溫(wen)度(du)(du)(du)一(yi)電(dian)(dian)導(dao)(dao)(dao)率(lv)的(de)(de)數據,也(ye)可(ke)使用本儀(yi)(yi)表測(ce)量。如果(guo)水中(zhong)導(dao)(dao)(dao)電(dian)(dian)組合(he)成(cheng)(cheng)份(fen)比率(lv)不確(que)定,則不可(ke)使用本儀(yi)(yi)表測(ce)量。

為避免電極(ji)極(ji)化,儀(yi)器產(chan)生高穩定(ding)度的(de) 方波(bo)信(xin)(xin)(xin)(xin)號(hao)(hao)加在電導池上,流(liu)過電導池的(de)電流(liu)與被測溶液的(de)濃(nong)度成正比,二次表將電流(liu)由 高阻(zu)抗運(yun)算(suan)放大(da)器轉化為電壓后(hou),經程控信(xin)(xin)(xin)(xin)號(hao)(hao)放大(da)、檢波(bo)和濾(lv)波(bo)后(hou)得(de)到(dao)反映濃(nong)度的(de)電位信(xin)(xin)(xin)(xin)號(hao)(hao)。微(wei)處理器對溫度信(xin)(xin)(xin)(xin)號(hao)(hao)和電導率信(xin)(xin)(xin)(xin)號(hao)(hao)交替(ti)采(cai)樣(yang),經過運(yun)算(suan)和溫度補償后(hou),得(de)到(dao)恒定(ding)溫度下的(de)濃(nong)度值。


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