橫河SC29-PTG29氧化還原電極SC29-PTG29傳感器
SC29
SC29 Redox/pH
This combined electrode can be used in processes with a
constant pH value or for processes where the Redox potential is dependent on the pH in order to achieve a pH compensated Redox potential. In such a case a pH/Redox converter with a high input is required. All pH/Redox converters of Yokogawa have such an input.
SC29（C） Redox/Reference
Additional features for type SC29C-PTP29
• General purpose redox measurements
• Diaphragm resistance （25ºC） < 5 kΩ
• High quality Ag/AgCl reference system （pin） which can stand high temperatures and temperature fluctuations
• Double junction, thickened saturated KCl-solution
• Built-in salt bridge prevents poisoning of the reference.
• Large area PTFE junction to resist fouling.
Additional features of type SC29-PTG29
• Bulb shaped glass membrane.
• Ag/AgCl wire reference system
• Glass Resistance （25ºC）: 50 to 100 MΩ
Additional features for types SC29C-PTC55
• Heavy duty pH sensitive glass.
• Flowing reference system for pollution resistance,
and highly stable reference potential.
• PG13.5 standard DIN electrode connection.
• Adapter to ensure compatibility with full fitting program.
Specifications Redox Electrodes
Type | Temperature range | Process pressure | Metal surface |
SM29-PT9 SC29C（D）-PTP29 SC29-PTG29 SC29C-PTC55 | 0 - 130ºC -10 - 100ºC 0 - 100ºC -10 - 100ºC | max. 1000 kPa max. 500 kPa max. 1000 kPa max. 500 kPa | Platinum Platinum Platinum Platinum |
SC29-PTC54
D. COMBINED ELECTRODES
The combined electrodes are for applications where installation of separate sensors is not possible.
Basically, there are two types:
1. REDOX/REFERENCE
The combined redox/reference electrode for general applications. It has a large KCl-reservoir for long operating life. For atmospheric conditions this electrode can be mounted in a mounting kit FP20- S13. For higher process pressure KCl-ratings the reservoir should be pressurised （the pressure on the reference liquid should be over the process pressure）. For this application the mounting kit FP20- S14 can be used.
FEATURES
● Polarisation free measurement by （patented） inert metal surface.
● Steam sterilisable.
● Dome shaped surface.
● Refillable at the side.
● Temperature range: 0…130°C.
● Process pressure: max. 500 kPa （5 bar）.
● Mounting kit （accessory） for fixing in a fitting.
SPECIFICATIONS
TYPE | TEMP. RANGE | PROCESS PRESSURE | MEMBRANE | REFERENCE LIQUID | REFERENCE SYSTEM | DIAPHRAGM | FLOW |
SC29-PTC54 | 0…130°C | 0…500 kPa | platinum | KCl-solution （1m.） thickened | Ag/AgCl silver-silver- chloride | Ceramic resistance: <10 kOhm | max 0,5 ml/day at 10 kPa overpressure |
SC29-AUG28
2. REDOX /PH
This combined electrode can be used in processes with a constant pH value or for processes where the Redox potential is dependent on pH in order to achieve pH compensated Redox potential.
A Redox-converter with a high impedance reference input is required.
FEATURES
● Polarisation free measurement by （patented） inert metal surface.
● Process pressure: max. 1MPa （10 bar）.
● Temperature range: 0…100°C.
● Bulb shaped glass membrane.
● Ring shaped gold surface.
SPECIFICATIONS
TYPE | TEMP. RANGE | PROCESS PRESSURE | REFERENCE SYSTEM | MEMBRANES | |
GLASS | METAL | ||||
SC29-AUG28 | 0…100°C | 0…1 MPa | Ag/AgCl （wire） silver-silverchloride 1m. KCl | universal pH- glass resistance: 50…100 MOhm/25°C Bulb （shockproof） | gold |
pH電極又稱(chēng)pH探頭、pH傳感器，英文名稱(chēng)pH electrode或pH sensor，是PH計(jì)上與被測(cè)物質(zhì)接觸的部分，用來(lái)測(cè)電極電位的裝置。
通常有兩種方法測(cè)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(xiàn)測(cè)量和過(guò)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(cè)量的核心理論是能斯特方程。
電位分析法所用的電極被稱(chēng)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(chēng)為電動(dòng)勢(shì)（EMF）。此電動(dòng)勢(shì)（EMF）由二個(gè)半電池構(gòu)成。其中一個(gè)半電池稱(chēng)作測(cè)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(chēng)作參比電極，它一般是與測(cè)量溶液相通，并且與測(cè)量?jī)x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(xiàn)pH測(cè)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。
zui初人們對(duì)酸堿的意識(shí)是入口食物的味道，譬如醋是酸的，檸檬也是酸的，嘗起來(lái)澀澀的堿面是堿性的，這是pH值或酸堿度zui初的由來(lái)，簡(jiǎn)單直觀。
以摩爾值表示水相溶液中的氫離子濃度，濃度從100（1）到10-14，再以10為底的負(fù)對(duì)數(shù)換算，pH范圍即為0-14。pH是拉丁文pondus hydrogenii的縮寫(xiě)，pondus =壓強(qiáng)，hydrogenii =氫。因此，更精準(zhǔn)的pH值定義應(yīng)是水相溶液中氫離子活度的負(fù)對(duì)數(shù)值，理解這一點(diǎn)非常重要。您可以因此了解到*: 相對(duì)而言，液體更容易實(shí)現(xiàn)精確的pH值測(cè)量，第二: 水相溶液環(huán)境里更容易實(shí)現(xiàn)精確的pH值測(cè)量。
而且，日常生活工作和生產(chǎn)中大部分的pH[1]值測(cè)量都是圍繞液體工作的。例如人類(lèi)攝入的食物藥物以及液體居多，即使終產(chǎn)品不是液體其來(lái)源環(huán)境也是液體，譬如人類(lèi)的液體食物有很多:白酒、啤酒、碳酸飲料、果汁、咖啡和茶葉，pH值影響著食物的風(fēng)味和品質(zhì)，pH值是藥物生產(chǎn)中的重要指標(biāo)。而pH值檢測(cè)并不簡(jiǎn)單，工業(yè)制藥生產(chǎn)液態(tài)物質(zhì)比固態(tài)物質(zhì)多得多（由此不難理解工業(yè)上水的重要性了），常見(jiàn)工業(yè)用水有冷卻水、清洗用水、加熱水、蒸汽和溶劑用水等，除此之外，還包括需要進(jìn)一步做環(huán)保處理的污水。那么，工業(yè)生產(chǎn)中，物質(zhì)經(jīng)歷著各種變化，相當(dāng)一部分反應(yīng)又伴隨著氫離子濃度的變化，因此檢測(cè)水相溶液中氫離子濃度的大小即pH值尤為重要。
精確的pH測(cè)量可以幫助實(shí)現(xiàn):
1、生產(chǎn)出我們預(yù)期想要的產(chǎn)品
2、盡可能的以*生產(chǎn)
3、防止物料損壞、人員傷亡和環(huán)境污染
4、滿(mǎn)足法規(guī)要求
5、研發(fā)工作順利進(jìn)行
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