一、ph計是什么意思

ph計是測量pH值的儀器。

ph計是(shi)專為(wei)使(shi)用(yong)離子選擇電(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)而設計(ji)(ji)的(de)一(yi)種精密的(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)子毫伏計(ji)(ji)。由(you)于(yu)pH指(zhi)示電(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)的(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)位隨(sui)溶液pH值(zhi)的(de)變(bian)(bian)化而變(bian)(bian)化，所(suo)以當pH指(zhi)示電(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)（如pH玻(bo)璃電(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)）和(he)(he)參比電(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)（如飽(bao)和(he)(he)甘(gan)汞電(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)）浸(jin)在(zai)溶液中(zhong)構成測量(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)時，所(suo)產生(sheng)的(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)勢(shi)(shi)與溶液的(de)pH值(zhi)有(you)(you)關。pH計(ji)(ji)將電(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)勢(shi)(shi)輸出(chu)轉換成pH讀數(shu)，每(mei)一(yi)pH間隔相當于(yu)2.303RT/F伏，此值(zhi)隨(sui)測量(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)中(zhong)溶液的(de)溫度(du)不同而變(bian)(bian)動(dong)(dong)，所(suo)以pH計(ji)(ji)上(shang)都裝有(you)(you)溫度(du)補償旋鈕，調節它可使(shi)每(mei)一(yi)pH間隔的(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)勢(shi)(shi)改(gai)變(bian)(bian)值(zhi)正好相當于(yu)測量(liang)(liang)溫度(du)應有(you)(you)的(de)變(bian)(bian)動(dong)(dong)值(zhi)。pH計(ji)(ji)上(shang)還裝有(you)(you)定位調節器，其作用(yong)是(shi)在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)勢(shi)(shi)上(shang)加一(yi)個適(shi)當電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)，使(shi)pH計(ji)(ji)讀數(shu)與標(biao)準pH值(zhi)一(yi)致。這(zhe)樣，溶液的(de)pH值(zhi)直接(jie)在(zai)儀表上(shang)顯示出(chu)來(lai)。pH計(ji)(ji)的(de)一(yi)般測量(liang)(liang)范(fan)圍是(shi)pH0～14，并備有(you)(you)±mV擋以擴展使(shi)用(yong)范(fan)圍。

二、ph計有哪些種類

現在(zai)市面上(shang)流通的酸度計(ji)主要為實(shi)驗(yan)室酸度計(ji)、工業pH計(ji)、便攜式pH計(ji)和筆(bi)式酸度計(ji)四大類(lei)。

1、實驗室pH計，一(yi)般為(wei)臺式儀(yi)(yi)器，具有精度(du)高、重復性好、響應快、功能(neng)(neng)全(quan)、操作簡單等(deng)特點。如果為(wei)智能(neng)(neng)化儀(yi)(yi)器，一(yi)般還具有打印輸出、數據(ju)處理(li)等(deng)功能(neng)(neng)。

2、工(gong)業(ye)pH計，主要用(yong)于工(gong)業(ye)流程的(de)連(lian)續測(ce)(ce)量，要求電極的(de)長(chang)期穩定性好，儀表不僅要有測(ce)(ce)量顯示功(gong)能(neng)，還要有報(bao)警和控制功(gong)能(neng)，以及方便安裝、清洗、抗干擾(rao)性能(neng)好等優勢。

3、便(bian)攜式(shi)pH計(ji)，主要用于(yu)現(xian)場(chang)測試和野外測量，要求附件(jian)配置齊全、方便(bian)攜帶，一般電源內置，方便(bian)移(yi)動測量。儀器的顯示要滿足戶外不同光線條件(jian)下的讀數(shu)。

4、筆式酸度(du)計，筆式酸度計是(shi)方便用戶攜帶，在現場或(huo)野外操(cao)作而(er)設計的(de)(de)。可同時顯(xian)示PH值和(he)溫度值，該儀(yi)器適用于自來水(shui)水(shui)源的(de)(de)監(jian)測(ce)，水(shui)族、水(shui)產、養殖、環保、印染(ran)、電鍍、飲料行業及科研單位等對水(shui)質、PH值的(de)(de)測(ce)定。