一、ph計是什么意思

ph計是測(ce)量pH值的儀器。

ph計是專(zhuan)為使(shi)(shi)用離子選擇電(dian)(dian)(dian)(dian)極(ji)(ji)(ji)而設(she)計的一種精密的電(dian)(dian)(dian)(dian)子毫(hao)伏計。由于pH指(zhi)示(shi)(shi)電(dian)(dian)(dian)(dian)極(ji)(ji)(ji)的電(dian)(dian)(dian)(dian)位隨(sui)溶(rong)(rong)(rong)液(ye)(ye)pH值(zhi)的變(bian)化而變(bian)化，所(suo)(suo)以(yi)當pH指(zhi)示(shi)(shi)電(dian)(dian)(dian)(dian)極(ji)(ji)(ji)（如pH玻(bo)璃電(dian)(dian)(dian)(dian)極(ji)(ji)(ji)）和(he)參比電(dian)(dian)(dian)(dian)極(ji)(ji)(ji)（如飽和(he)甘汞電(dian)(dian)(dian)(dian)極(ji)(ji)(ji)）浸在溶(rong)(rong)(rong)液(ye)(ye)中(zhong)構成測(ce)量(liang)電(dian)(dian)(dian)(dian)池(chi)時，所(suo)(suo)產生的電(dian)(dian)(dian)(dian)動(dong)勢(shi)(shi)與(yu)(yu)溶(rong)(rong)(rong)液(ye)(ye)的pH值(zhi)有關(guan)。pH計將(jiang)電(dian)(dian)(dian)(dian)動(dong)勢(shi)(shi)輸出(chu)轉換(huan)成pH讀數(shu)，每(mei)一pH間隔相當于2.303RT/F伏，此值(zhi)隨(sui)測(ce)量(liang)電(dian)(dian)(dian)(dian)池(chi)中(zhong)溶(rong)(rong)(rong)液(ye)(ye)的溫度(du)不(bu)同(tong)而變(bian)動(dong)，所(suo)(suo)以(yi)pH計上都裝有溫度(du)補償旋鈕，調(diao)節(jie)它可使(shi)(shi)每(mei)一pH間隔的電(dian)(dian)(dian)(dian)動(dong)勢(shi)(shi)改變(bian)值(zhi)正好相當于測(ce)量(liang)溫度(du)應有的變(bian)動(dong)值(zhi)。pH計上還裝有定位調(diao)節(jie)器，其作用是在電(dian)(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)(dian)動(dong)勢(shi)(shi)上加一個適當電(dian)(dian)(dian)(dian)壓，使(shi)(shi)pH計讀數(shu)與(yu)(yu)標(biao)準(zhun)pH值(zhi)一致。這樣，溶(rong)(rong)(rong)液(ye)(ye)的pH值(zhi)直接在儀(yi)表上顯(xian)示(shi)(shi)出(chu)來。pH計的一般測(ce)量(liang)范圍(wei)是pH0～14，并備(bei)有±mV擋以(yi)擴展使(shi)(shi)用范圍(wei)。

二、ph計有哪些種類

現(xian)在市面上(shang)流通(tong)的酸(suan)度計(ji)主要為實(shi)驗室酸(suan)度計(ji)、工業pH計(ji)、便攜式pH計(ji)和(he)筆式酸(suan)度計(ji)四大類(lei)。

1、實驗室pH計，一般為臺(tai)式儀器，具有精度(du)高、重復性(xing)好、響應快、功能全、操作簡單(dan)等特點。如(ru)果(guo)為智能化儀器，一般還具有打印(yin)輸出(chu)、數(shu)據處理等功能。

2、工業(ye)pH計，主要(yao)(yao)用于工業(ye)流(liu)程(cheng)的(de)(de)連續測(ce)量，要(yao)(yao)求電極的(de)(de)長期穩(wen)定性好，儀表不僅要(yao)(yao)有測(ce)量顯示功能(neng)，還要(yao)(yao)有報警和控制功能(neng)，以及方便安裝、清(qing)洗、抗干擾性能(neng)好等(deng)優勢。

3、便攜(xie)式pH計，主要用于現場測(ce)試和野外測(ce)量，要求附件配置齊全、方(fang)便攜(xie)帶，一(yi)般(ban)電源內(nei)置，方(fang)便移動測(ce)量。儀器的顯示要滿足戶外不同光(guang)線條件下的讀數。

4、筆式(shi)酸度計，筆式(shi)酸度計是方便用戶(hu)攜帶(dai)，在現(xian)場或野外(wai)操作而設(she)計的(de)。可同時顯(xian)示PH值(zhi)(zhi)和溫度值(zhi)(zhi)，該儀器適用于自(zi)來水水源的(de)監測(ce)，水族、水產(chan)、養殖、環保、印染、電鍍、飲料行(xing)業及科研(yan)單位等對水質、PH值(zhi)(zhi)的(de)測(ce)定。