一、ph計是什么意思

ph計是(shi)測量pH值的儀(yi)器。

ph計是專為使用離(li)子選擇電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)而(er)設計(ji)(ji)(ji)的一種(zhong)精密的電(dian)(dian)(dian)(dian)(dian)(dian)子毫(hao)伏計(ji)(ji)(ji)。由(you)于pH指(zhi)示(shi)電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)的電(dian)(dian)(dian)(dian)(dian)(dian)位(wei)隨溶(rong)(rong)液(ye)pH值(zhi)(zhi)(zhi)(zhi)的變(bian)化而(er)變(bian)化，所(suo)以(yi)(yi)當(dang)pH指(zhi)示(shi)電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)（如(ru)pH玻(bo)璃電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)）和(he)參比電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)（如(ru)飽和(he)甘汞電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)）浸(jin)在(zai)溶(rong)(rong)液(ye)中構(gou)成測(ce)量電(dian)(dian)(dian)(dian)(dian)(dian)池時，所(suo)產生的電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)勢(shi)(shi)與溶(rong)(rong)液(ye)的pH值(zhi)(zhi)(zhi)(zhi)有關。pH計(ji)(ji)(ji)將(jiang)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)勢(shi)(shi)輸出(chu)轉(zhuan)換成pH讀(du)數，每(mei)一pH間(jian)隔(ge)相(xiang)當(dang)于2.303RT/F伏，此(ci)值(zhi)(zhi)(zhi)(zhi)隨測(ce)量電(dian)(dian)(dian)(dian)(dian)(dian)池中溶(rong)(rong)液(ye)的溫度不(bu)同而(er)變(bian)動(dong)(dong)，所(suo)以(yi)(yi)pH計(ji)(ji)(ji)上(shang)都裝(zhuang)有溫度補償旋鈕，調節它可(ke)使每(mei)一pH間(jian)隔(ge)的電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)勢(shi)(shi)改變(bian)值(zhi)(zhi)(zhi)(zhi)正好相(xiang)當(dang)于測(ce)量溫度應有的變(bian)動(dong)(dong)值(zhi)(zhi)(zhi)(zhi)。pH計(ji)(ji)(ji)上(shang)還(huan)裝(zhuang)有定位(wei)調節器，其(qi)作用是在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)勢(shi)(shi)上(shang)加(jia)一個(ge)適(shi)當(dang)電(dian)(dian)(dian)(dian)(dian)(dian)壓，使pH計(ji)(ji)(ji)讀(du)數與標準pH值(zhi)(zhi)(zhi)(zhi)一致。這樣，溶(rong)(rong)液(ye)的pH值(zhi)(zhi)(zhi)(zhi)直接在(zai)儀表上(shang)顯示(shi)出(chu)來。pH計(ji)(ji)(ji)的一般測(ce)量范圍是pH0～14，并備有±mV擋以(yi)(yi)擴展使用范圍。

二、ph計有哪些種類

現在市面上流(liu)通(tong)的(de)酸(suan)度(du)計主(zhu)要為實驗(yan)室(shi)酸(suan)度(du)計、工業pH計、便攜式pH計和(he)筆式酸(suan)度(du)計四大類。

1、實驗室pH計(ji)，一般為臺式儀(yi)器，具(ju)有(you)精度高(gao)、重(zhong)復性好、響應快、功能全、操(cao)作簡單(dan)等(deng)特點。如果(guo)為智能化儀(yi)器，一般還具(ju)有(you)打印輸出、數據處理等(deng)功能。

2、工(gong)業(ye)pH計，主(zhu)要用(yong)于工(gong)業(ye)流(liu)程(cheng)的連(lian)續測量，要求電極的長期穩定(ding)性好，儀表不僅要有測量顯示功能(neng)，還要有報警(jing)和控制功能(neng)，以及(ji)方便(bian)安裝、清洗(xi)、抗(kang)干擾性能(neng)好等優勢。

3、便(bian)攜(xie)式pH計，主要(yao)用于現場測試和野(ye)外(wai)測量，要(yao)求附(fu)件配置(zhi)齊全、方(fang)便(bian)攜(xie)帶，一般電源(yuan)內置(zhi)，方(fang)便(bian)移動測量。儀器的(de)顯(xian)示要(yao)滿足戶外(wai)不(bu)同(tong)光線條件下(xia)的(de)讀(du)數。

4、筆式酸度(du)計，筆式酸度(du)計是(shi)方便用戶攜帶，在(zai)現(xian)場或野外操(cao)作而(er)設(she)計的。可同時顯示(shi)PH值(zhi)和溫度(du)值(zhi)，該儀器適用于自(zi)來水水源(yuan)的監測，水族、水產、養(yang)殖、環保、印染、電鍍、飲料行業(ye)及科研單(dan)位等對水質、PH值(zhi)的測定。