SC25V橫河SC25V-ALP25-120傳感器SC25V-ALP25-120
SC21 & SC25V Combined pH Electrodes
（non-flow）
Yokogawa continuously is improving the present pH sensing portfolio and designing new pH sensors integrating the latest improvements into the new design and upgrading our present.
The SC25V is the latest addition to the family. Yokogawa’s first combination pH sensor in a 12 mm design with an external Liquid earth. A new design made it possible to create a large electrolyte volume making this sensor last longer then most other comparible pH electrodes.
The SC21 series already for many years Yokogawa’s trusted range of combination pH electrodes still has the same variety of choices making it easy to find the best electrode for each application.
Features SC25V
• External titanium Liquid Earth
• Pt1000 integration in pH compartment giving highly accurate temperature compensation
• ATEX certified : ATEX II1G Ex ia IIC T3...T6 Ga
• CIP and Steam cleaning possible
• Large internal KCL volume giving the sensor a longer life time
• Measuring in Pure Water applications from 10 μS/cm
• Variopin connector
• SC24V-ALP25 for chemically harsh applications and high temperatures
• SC25V-AGP25 for all General Purpose applications
Model | Suffix Code | Option Code | Description |
SC25V |
|
| Combined 12mm sensor: pH, Ref, LE, Temperature Equiped with Variopin connector |
Sensor type | -AGP25 -ALP25 |
| General purpose High temp: Chemical resistant |
Sensor length | -120 -225 | 120mm 225mm | |
Specifications Combined pH electrodes with Temperature + Liquid earth
Type | Membrane | Resistance in MΩ/25ºC | pH-range | Temp. range （ºC） | Pressure range kPa | Reference liquid | Diaphragm system | Ref. | Atex |
SC25V-AGP25 | Universal pH-glass bulb | 175-275 | 0-14 | -10 - 80 | 0-1000 | Oversaturated KCl | Ag/AgCl （wire） | PTFE | Yes |
SC25V-ALP25 | Chem. Res. pH-glass dome | 500-700 | 0-14 | +15 - 130 | 0-1000 | Oversaturated KCl | Ag/AgCl （wire） | PTFE | Yes |
pH電極又稱pH探頭、pH傳感器，英文名稱pH electrode或pH sensor，是PH計(jì)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(gè)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(dòng)勢（EMF）。此電動(dòng)勢（EMF）由二個(gè)半電池構(gòu)成。其中一個(gè)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(gè)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(hù)套及電纜等四部分構(gòu)成。
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