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進口ph計

二)PH計原理

　　用酸度計進行電位測量是(shi)測量pHzui精(jing)密的(de)方法。pH計由三個部件(jian)構(gou)成(cheng)：

　　(1)一個參比電極(ji);

　　(2)一個玻璃電(dian)極，其電(dian)位(wei)取決于周圍溶液的(de)pH;

　　(3)一個電(dian)(dian)流計，該電(dian)(dian)流計能在電(dian)(dian)阻極大的(de)電(dian)(dian)路中測量出微小的(de)電(dian)(dian)位(wei)差。

　　PH計由于采用(yong)的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)設(she)計(ji)和(he)固體電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路技術，現在的(de)(de)(de)(de)(de)(de)pH可分辨出(chu)(chu)0.005pH單(dan)位(wei)(wei)。參(can)比電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)的(de)(de)(de)(de)(de)(de)基本(ben)功能(neng)是(shi)維(wei)持一個(ge)恒(heng)定(ding)的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)位(wei)(wei)，作為(wei)測(ce)量各種偏離電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)位(wei)(wei)的(de)(de)(de)(de)(de)(de)對照。銀(yin)-氧化(hua)銀(yin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)是(shi)目前(qian)pH中(zhong)zui常(chang)用(yong)的(de)(de)(de)(de)(de)(de)參(can)比電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)。玻璃(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)的(de)(de)(de)(de)(de)(de)功能(neng)是(shi)建立一個(ge)對所測(ce)量溶(rong)(rong)液的(de)(de)(de)(de)(de)(de)氫離子活度發生(sheng)變(bian)化(hua)作出(chu)(chu)反(fan)應(ying)的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)位(wei)(wei)差(cha)。把(ba)對pH敏(min)感的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)和(he)參(can)比電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)放(fang)(fang)在同一溶(rong)(rong)液中(zhong)，就組成(cheng)一個(ge)原電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池，該電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)位(wei)(wei)是(shi)玻璃(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)和(he)參(can)比電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)位(wei)(wei)的(de)(de)(de)(de)(de)(de)代數和(he)。E電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池=E參(can)比 E玻璃(li)，如果溫度恒(heng)定(ding)，這個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)位(wei)(wei)隨待測(ce)溶(rong)(rong)液的(de)(de)(de)(de)(de)(de)pH變(bian)化(hua)而變(bian)化(hua)，而測(ce)量酸度計(ji)中(zhong)的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池產生(sheng)的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)位(wei)(wei)是(shi)困難的(de)(de)(de)(de)(de)(de)，因其電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)勢(shi)非常(chang)小，且(qie)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路的(de)(de)(de)(de)(de)(de)阻抗(kang)又非常(chang)大(da)(da)(da)(1-100MΩ);因此，必(bi)須把(ba)信(xin)號(hao)(hao)放(fang)(fang)大(da)(da)(da)，使其足以推(tui)動(dong)標準毫(hao)伏表或毫(hao)安表。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流計(ji)的(de)(de)(de)(de)(de)(de)功能(neng)就是(shi)將原電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)位(wei)(wei)放(fang)(fang)大(da)(da)(da)若干(gan)倍，放(fang)(fang)大(da)(da)(da)了(le)的(de)(de)(de)(de)(de)(de)信(xin)號(hao)(hao)通過電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表顯示出(chu)(chu)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表指針偏轉的(de)(de)(de)(de)(de)(de)程度表示其推(tui)動(dong)的(de)(de)(de)(de)(de)(de)信(xin)號(hao)(hao)的(de)(de)(de)(de)(de)(de)強度，為(wei)了(le)使用(yong)上的(de)(de)(de)(de)(de)(de)需要，pH電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流表的(de)(de)(de)(de)(de)(de)表盤刻有相應(ying)的(de)(de)(de)(de)(de)(de)pH數值(zhi)(zhi);而數字式pH計(ji)則直接以數字顯出(chu)(chu)pH值(zhi)(zhi)

　　三)PH計如何選型

　　PH計技術指標

　　1、測量范圍：

　　pH值(zhi): 0～14.00pH ，分度值(zhi): 0.01pH;

　　溫度: 0～99.9℃， 分度值: 0.1℃;

　　電位值: –1999～ 1999mV ， 分(fen)度值: 0.1mV;

　　2、精度：pH值(zhi): ±0.05pH ;溫(wen)度：±0.5℃(0～60.0℃);

　　3、自動溫度補(bu)償范圍： 0～100.0℃，25℃為(wei)基準;

　　4、被測水樣：0～100.0℃，0.6Mpa ;

　　5、電子單元自動溫度補(bu)償(chang)誤差：±0.03pH ;

　　6、電(dian)子單元(yuan)重復(fu)性誤差(cha)：±0.02pH ;

　　7、穩定性(xing)：±0.02pH/24h ;

　　8、雙高阻(zu)輸入，輸入阻(zu)抗：≥1012 Ω ;

　　9、電流隔離輸(shu)出： 4～20 mA(負(fu)載<750 Ω );

　　10、輸出電流(liu)誤差(cha)：≤±1%FS ;

　　11、電(dian)(dian)源： AC220V±22V，50Hz±1Hz;可選配DC24±2.4V,1A供電(dian)(dian);請訂貨(huo)時(shi)指(zhi)(zhi)明(ming)(ming)，不指(zhi)(zhi)明(ming)(ming)按AC220V供電(dian)(dian);

　　12、防護等級：IP65;

　　13、儀表通(tong)(tong)道數(shu)二至四通(tong)(tong)道可以選擇，各通(tong)(tong)道之間相互獨立(li)。請訂貨時指明(ming)通(tong)(tong)道數(shu)，不指明(ming)按兩(liang)通(tong)(tong)道配(pei)置;

　　14、各通(tong)道的數據同時測(ce)量，同屏顯示(shi)，不(bu)用切(qie)換(huan)顯示(shi);

　　15、外形尺寸：146(長)×146(寬)×108(深)mm ，開孔尺寸：138×138 mm;

　　16、重量： 0.8kg ;

　　17、工作條件：環境溫(wen)度 0～60℃ 相(xiang)對濕度 <85% ;

　　18、根(gen)據測量介質(zhi)選配pH電(dian)極。請訂(ding)貨時(shi)指(zhi)明電(dian)極型號。

　　19、二次表安裝方(fang)式：開孔式/壁掛式/架(jia)裝式/管道(dao)式

　　20、電極(ji)安(an)裝方式：流通式/沉入式/法蘭式/管道(dao)式

　　標準(zhun)配置：二次(ci)表一臺(tai)，電極(ji)，pH(4、7、9)標準(zhun)緩沖液(ye)各兩包。

　　PH計主要特點

　　雙(shuang)通(tong)道(dao)pH計(ji)、三(san)通(tong)道(dao)pH計(ji)、四通(tong)道(dao)pH計(ji)，客戶可(ke)(ke)以任(ren)意選擇(ze)，各(ge)通(tong)道(dao)之間相互獨立，互不干擾，zui多可(ke)(ke)以同時接四支pH電極。

　　中(zhong)文液晶顯示，中(zhong)文菜單式操作。

　　微機化：采用高(gao)性能(neng)CPU芯片、高(gao)精度(du)AD轉換(huan)技術(shu)和SMT貼片技術(shu)，完(wan)成(cheng)多(duo)參數(shu)測量(liang)、溫度(du)補(bu)償、儀表自檢，精度(du)高(gao)，重復性好。

　　防水防塵設(she)計：防護等(deng)級IP65，適(shi)宜戶外使(shi)用。

　　電磁兼容(rong)性(EMC/RFI)設(she)計：按(an)歐洲標準EN50081/50082設(she)計制造(zao)。

　　實現(xian)25℃折算：能斯(si)特電極斜(xie)率(lv)溫度補償，純(chun)水和加(jia)氨超純(chun)水25℃折算。

　　雙高阻輸入電路(lu)：低內(nei)阻pH電極，儀器穩定性好，響(xiang)應快，抗干擾強。

　　溶液地(di)連接：消除地(di)回路干擾。

　　四種標定方式

　　隔離的4～20 mA電(dian)流(liu)輸(shu)出;電(dian)流(liu)對(dui)應pH值的輸(shu)出上、下限(xian)可任意(yi)設定(ding)。

　　工(gong)業控制式看門狗：確保儀表不會死機。

　　手動(dong)電(dian)流源：方便記錄及檢(jian)測裝置(zhi)的測試(shi)。

　　密碼管理：標定、參數設置(zhi)和(he)維護均有(you)密碼保護。