橫河SM21-AL2電極 PH計(jì)SM21-AL2橫河
橫河電機(jī)有限公司創(chuàng)建于1915年,總部設(shè)在日本東京。在世界29個(gè)地區(qū)擁有60多家子公司。經(jīng)營(yíng)領(lǐng)域涉及測(cè)量、控制、信息三大領(lǐng)域,在工業(yè)控制行業(yè)是zui為專(zhuān)業(yè)的跨國(guó)公司之一。1975年*研制出世界上*套具有劃時(shí)代意義的集散型控制系統(tǒng)(DCS系統(tǒng)),對(duì)石油、化工等大型工廠(chǎng)的生產(chǎn)過(guò)程進(jìn)行測(cè)量、運(yùn)行監(jiān)視和控制,為工業(yè)的發(fā)展和社會(huì)的進(jìn)步做出了*貢獻(xiàn),到目前已相繼推出了7代CENTUM DCS系列產(chǎn)品,流量表、變送器、分析儀等現(xiàn)場(chǎng)儀表也得到了用戶(hù)的高度評(píng)價(jià)
橫河電機(jī)是同行業(yè)中zui早進(jìn)入中國(guó)的外資企業(yè),在1979年開(kāi)設(shè)了北京駐在員事務(wù)所,1985年與中國(guó)建立了*個(gè)合資公司,橫河西儀有限公司。2002年10月在位于蘇州的蘇州新加坡工業(yè)園區(qū)內(nèi)設(shè)立了*獨(dú)資的“橫河電機(jī)(蘇州)有限公司”,工廠(chǎng)總面積13.5萬(wàn)平方米,目前投入生產(chǎn)使用的*工廠(chǎng)面積為2.5萬(wàn)平方米,生產(chǎn)流量計(jì),記錄儀等,其所設(shè)立的流量標(biāo)定系統(tǒng)zui大可標(biāo)定2.6米口徑的流量計(jì),是世界zui大規(guī)模的標(biāo)定系統(tǒng)。2006年1月1日,“橫河電機(jī)中國(guó)商貿(mào)有限公司”成立,該公司作為具有銷(xiāo)售、市場(chǎng)開(kāi)發(fā)、工程技術(shù)服務(wù)的橫河集團(tuán)的中堅(jiān)企業(yè),與已經(jīng)活躍在中國(guó)國(guó)內(nèi)市場(chǎng)上的集團(tuán)中另外8家公司協(xié)力,大力開(kāi)拓中國(guó)市場(chǎng)。2008年2月1日,為了擴(kuò)大在中國(guó)工業(yè)自動(dòng)化領(lǐng)域的業(yè)務(wù),取得更大的*,橫河電機(jī)集團(tuán)對(duì)旗下中國(guó)三家相關(guān)公司的業(yè)務(wù)進(jìn)行整合,成立新的法人企業(yè)“橫河電機(jī)(中國(guó))有限公司”,作為在中國(guó)的統(tǒng)括公司,通過(guò)強(qiáng)化銷(xiāo)售、、工程、售后服務(wù)等方面職能,來(lái)適應(yīng)中國(guó)工業(yè)自動(dòng)化市場(chǎng)的多元化需求。
集團(tuán)在上海設(shè)立了應(yīng)答中心,將逐步建立一個(gè)完善的設(shè)有系統(tǒng)專(zhuān)家,服務(wù)網(wǎng)路遍布全中國(guó),24小時(shí)365天全年無(wú)休的迅速響應(yīng)系統(tǒng),隨時(shí)滿(mǎn)足顧客的各種需求。橫河電機(jī)(中國(guó))有限公司集中了中國(guó)各分公司的技術(shù)資源,強(qiáng)化工程隊(duì)伍,確立了在石油、天然氣、化工、能源、鋼鐵等行業(yè)能夠提供優(yōu)質(zhì)的,有綜合競(jìng)爭(zhēng)力的工程技術(shù)業(yè)務(wù)體制.
SM21
SM21 Single Glass Electrodes
The glass membrane is the most important part of the complete pH measuring loop. pH sensitive glass has the particular property that alkali metal ions present in the texture of the glass are exchanged with H+ ions of the liquid. The selection of the correct type of glass electrode depends on both the type of glass membrane thickness of the glass membrane.
Two types of glass are available, as described here:
”G” glass
This is used for the membranes of electrodes in processes where the nominal pH value varies between pH0 and pH10. Since this type of glass has a wide application range it is also termed “general purpose” glass.
“L” glass
The application of “L” glass is for measurements in alkaline media with high process temperatures.
Features
• low resistance glass for fast response and sensitivity
• High resistance glass for chemical resistance
• L-glass sensors for high temperature chemically harsh applications
• G-glass sensors for all general applications
• ”All glass” construction.
• Dimensions and design meet the requirements of DIN 19263.
• Isothermal point of intersection: pH 7 (nominal value at 0 mV).
• Maximum pressure: 1000 kPa (10 bar).
• Metal foil screening.
• Bulb membrane for general purpose.
• Dome shaped membrane for “Heavy Duty” applications.
Thickness of the glass membrane
Shockproof
A bulb shaped glass membrane suitable for general purpose
Heavy duty
This dome shaped glass membrane is suitable for harsh and abbresive applications.
Selection guide separate electrodes : Glass sensors
modelcode | Bulb type | Glass resistance (Mohm) | T range (°C) | Pressure (bar) | Applications | remark |
SM21(D)-AG2 | Universal | 25-50 | 0-80 | 10 | light, laboratory | fast response, high sensitivity |
SM21(D)-AG4 | shockproof | 50-100 | 0-100 | 10 | general | Universal |
SM21(D)-AG6 | heavy duty | 120-200 | 0-100 | 10 | Harsh | mechanically strong |
SM21(D)-AL4 | shockproof | 300-450 | 15-130 | 10 | High Temperature | T cont. ≥ 70°C, high chem. Resistance |
SM21(D)-AL6 | heavy duty | 600-900 | 25-130 | 10 | High T + abbresive | T cont. ≥ 70°C, high chem. Resistance |
* all pH glass sensors have a sodium error of 0.17 pH above pH=13 this because the glass then will see the Na+ ion as H+ ion. The pH reading is lower than it is in reality.