一、ph計是什么意思

ph計是測(ce)量(liang)pH值的儀器。

ph計是(shi)專(zhuan)為使用(yong)離子選擇電(dian)(dian)(dian)(dian)(dian)極而(er)設計(ji)的(de)(de)一(yi)種(zhong)精密的(de)(de)電(dian)(dian)(dian)(dian)(dian)子毫伏(fu)計(ji)。由于pH指示電(dian)(dian)(dian)(dian)(dian)極的(de)(de)電(dian)(dian)(dian)(dian)(dian)位隨(sui)溶(rong)(rong)液pH值(zhi)的(de)(de)變(bian)(bian)(bian)化(hua)而(er)變(bian)(bian)(bian)化(hua)，所(suo)以當(dang)pH指示電(dian)(dian)(dian)(dian)(dian)極（如pH玻璃電(dian)(dian)(dian)(dian)(dian)極）和參(can)比電(dian)(dian)(dian)(dian)(dian)極（如飽(bao)和甘汞電(dian)(dian)(dian)(dian)(dian)極）浸(jin)在溶(rong)(rong)液中(zhong)構成測(ce)量電(dian)(dian)(dian)(dian)(dian)池時，所(suo)產(chan)生的(de)(de)電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)勢(shi)(shi)與溶(rong)(rong)液的(de)(de)pH值(zhi)有關。pH計(ji)將電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)勢(shi)(shi)輸出轉換(huan)成pH讀(du)(du)數，每一(yi)pH間(jian)隔(ge)(ge)相(xiang)當(dang)于2.303RT/F伏(fu)，此值(zhi)隨(sui)測(ce)量電(dian)(dian)(dian)(dian)(dian)池中(zhong)溶(rong)(rong)液的(de)(de)溫(wen)度不(bu)同而(er)變(bian)(bian)(bian)動(dong)(dong)，所(suo)以pH計(ji)上(shang)(shang)都裝有溫(wen)度補(bu)償(chang)旋鈕，調節它(ta)可使每一(yi)pH間(jian)隔(ge)(ge)的(de)(de)電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)勢(shi)(shi)改變(bian)(bian)(bian)值(zhi)正(zheng)好相(xiang)當(dang)于測(ce)量溫(wen)度應有的(de)(de)變(bian)(bian)(bian)動(dong)(dong)值(zhi)。pH計(ji)上(shang)(shang)還裝有定位調節器，其作用(yong)是(shi)在電(dian)(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)勢(shi)(shi)上(shang)(shang)加一(yi)個適當(dang)電(dian)(dian)(dian)(dian)(dian)壓(ya)，使pH計(ji)讀(du)(du)數與標準pH值(zhi)一(yi)致。這(zhe)樣(yang)，溶(rong)(rong)液的(de)(de)pH值(zhi)直(zhi)接在儀表上(shang)(shang)顯示出來。pH計(ji)的(de)(de)一(yi)般測(ce)量范圍是(shi)pH0～14，并備(bei)有±mV擋以擴(kuo)展使用(yong)范圍。

二、ph計有哪些種類

現在市面上流通(tong)的酸(suan)度(du)(du)計(ji)(ji)主要為實驗室酸(suan)度(du)(du)計(ji)(ji)、工(gong)業pH計(ji)(ji)、便(bian)攜式(shi)pH計(ji)(ji)和(he)筆式(shi)酸(suan)度(du)(du)計(ji)(ji)四大類。

1、實驗室(shi)pH計，一般(ban)為臺式儀器，具有(you)(you)精度高、重(zhong)復性(xing)好、響(xiang)應快(kuai)、功能全、操作(zuo)簡單等特點。如果為智能化儀器，一般(ban)還具有(you)(you)打(da)印輸出、數(shu)據處理等功能。

2、工業pH計，主(zhu)要用于(yu)工業流程的連續測(ce)(ce)量，要求電(dian)極的長期穩定性好，儀表(biao)不僅要有測(ce)(ce)量顯示功(gong)能(neng)，還(huan)要有報(bao)警和控(kong)制功(gong)能(neng)，以(yi)及方便安裝、清洗、抗(kang)干擾性能(neng)好等優勢。

3、便(bian)攜式(shi)pH計，主要(yao)用(yong)于現(xian)場測(ce)試和(he)野外測(ce)量(liang)，要(yao)求附件(jian)配置齊全、方便(bian)攜帶，一般電源內(nei)置，方便(bian)移(yi)動測(ce)量(liang)。儀器(qi)的(de)(de)顯(xian)示要(yao)滿足戶外不同光線條件(jian)下的(de)(de)讀數。

4、筆式酸度計(ji)，筆式酸度計是方便用戶攜帶，在現場或(huo)野外操作而設計的。可同(tong)時顯示(shi)PH值和溫度值，該(gai)儀器適(shi)用于(yu)自來水水源的監測(ce)，水族、水產、養殖、環保、印染、電鍍、飲料行業及科研單位等對水質、PH值的測(ce)定(ding)。