SC21橫河SC21-AGP24電極SC21-AGP24傳感器
Characteristics of type SC21-AGP24
• Ag/AgCl wire reference system.
• pH bulb with cage protection
• Less maintenance due to the gelled electrolyte and porous PTFE.
• Thickened electrolyte （3.3 m.）.
Characteristics of type SC21-AAP26
• High quality Ag/AgCl reference system （pin） which can stand high temperatures and temperature fluctuations.
• Built-in salt bridge to prevent poisoning of the reference system.
• A large area PTFE junction to resist fouling to a high degree.
Characteristics of type SC21-AGP26
• High quality Ag/AgCl reference system （pin） which can stand high temperatures and temperature fluctuations.
• Double junction （thickened saturated KCl-solution）. The built-in salt bridge prevents poisoning of the reference system.
• Heavy duty glass membrane for prolonged operation in
corrosive, abrasive and fouling environments （withstanding traces of HF）.
• A large area PTFE junction to resist fouling.
Characteristics of type SC21-ALP26
• Chemical resistant, steam-sterillisable pH-glass.
Characteristics of type SC21C-AGP64
• Ag/AgCl wire reference system
• Less maintenance by the combination of gelled electrolyte
and porous PTFE.
• 3.3 m KCl electrolyte
Specifications Combined pH Electrodes （non-flow）
Type | Membrane | Resistance in MΩ/25ºC | pH-range | Temp. range （ºC） | Pressure range kPa | Reference liquid | Reference system | Diaphragm | Flow |
SC21-AGP24 | Universal pH-glass bulb | 50 - 100 | 0 - 14 | 0 - 80 | 1-500 | 3.3 m. KCI Thickened | Ag/AgCl （wire） Silver-silverchloride | Porous PTFE | 0 |
SC21（D）-AAP26 Chem. res. pH-glass bulb 250 - 400 0 - 14 0 - 110 1-500 Oversatured Ag/AgCl （wire） Porous PTFE 0 | |||||||||
| steam-sterrillisable 3/4 bulb |
|
|
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| KCI thickened | Silver-silverchloride |
|
|
SC21-ALP26 | Chem. res. pH-glass dome | 500 - 900 | 0 - 14 | 10 - 120 | 1-500 | Oversatured KCI thickened | Ag/AgCl （wire） Silver-silverchloride | Porous PTFE | 0 |
SC21-AGP26 | Universal pH-glass bulb | 120 - 200 | 0 - 14 | -10 - 100 | 1-500 | Oversatured KCI thickened | Ag/AgCl （wire） Silver-silverchloride | Porous PTFE | 0 |
SC21-AGP64 | Universal pH-glass bulb | 50 - 100 | 0 - 14 | 0 - 80 | 1-500 | 3.3 m. KCI Thickened | Ag/AgCl （wire） Silver-silverchloride | Porous PTFE | 0 |
model | Suffix code | Description 1 | Description 2 | Description 3 |
SC21（C/D） |
| pH/ref combination electrode |
|
|
Sensor type Non-flow | -AGP24 -AGP64 -AAP26 -AGP26 -ALP26 | General purpose General purpose General purpose Heavy duty Heavy duty | with protection cage PG15,5 process com Double junction Double junction Double junction |
High temperature electrode Moderate temperature High temperature electrode |
pH電極又稱pH探頭、pH傳感器，英文名稱pH electrode或pH sensor，是PH計上與被測物質(zhì)接觸的部分，用來測電極電位的裝置。
通常有兩種方法測量水相溶液中的pH值，比色法（pH試紙和比色皿）和電位法。電位法是能夠?qū)崿F(xiàn)連續(xù)在線測量和過程監(jiān)控的*方法，而且電位法可獲得精確且結(jié)果可重復(fù)的pH值，pH電極測量的核心理論是能斯特方程。
電位分析法所用的電極被稱為原電池。原電池是一個系統(tǒng)，它的作用是使化學(xué)反應(yīng)能量轉(zhuǎn)成為電能。此電池的電壓被稱為電動勢（EMF）。此電動勢（EMF）由二個半電池構(gòu)成。其中一個半電池稱作測量電極，它的電位與特定的離子活度有關(guān)；另一個半電池為參比半電池，通常稱作參比電極，它一般是與測量溶液相通，并且與測量儀表相連。zui熟悉也是zui常用的PH指示電極是玻璃電極。
一套工業(yè)在線pH測量系統(tǒng)通常由pH傳感器即pH電極、pH變送器、電極護套及電纜等四部分構(gòu)成。
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