橫河SM21-AL2電極 PH計SM21-AL2橫河
橫河電機有限公司創(chuàng)建于1915年,總部設(shè)在日本東京。在世界29個地區(qū)擁有60多家子公司。經(jīng)營領(lǐng)域涉及測量、控制、信息三大領(lǐng)域,在工業(yè)控制行業(yè)是zui為專業(yè)的跨國公司之一。1975年*研制出世界上*套具有劃時代意義的集散型控制系統(tǒng)(DCS系統(tǒng)),對石油、化工等大型工廠的生產(chǎn)過程進行測量、運行監(jiān)視和控制,為工業(yè)的發(fā)展和社會的進步做出了*貢獻,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)場儀表也得到了用戶的高度評價
橫河電機是同行業(yè)中zui早進入中國的外資企業(yè),在1979年開設(shè)了北京駐在員事務(wù)所,1985年與中國建立了*個合資公司,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*獨資的“橫河電機(蘇州)有限公司”,工廠總面積13.5萬平方米,目前投入生產(chǎn)使用的*工廠面積為2.5萬平方米,生產(chǎn)流量計,記錄儀等,其所設(shè)立的流量標定系統(tǒng)zui大可標定2.6米口徑的流量計,是世界zui大規(guī)模的標定系統(tǒng)。2006年1月1日,“橫河電機中國商貿(mào)有限公司”成立,該公司作為具有銷售、市場開發(fā)、工程技術(shù)服務(wù)的橫河集團的中堅企業(yè),與已經(jīng)活躍在中國國內(nèi)市場上的集團中另外8家公司協(xié)力,大力開拓中國市場。2008年2月1日,為了擴大在中國工業(yè)自動化領(lǐng)域的業(yè)務(wù),取得更大的*,橫河電機集團對旗下中國三家相關(guān)公司的業(yè)務(wù)進行整合,成立新的法人企業(yè)“橫河電機(中國)有限公司”,作為在中國的統(tǒng)括公司,通過強化銷售、、工程、售后服務(wù)等方面職能,來適應(yīng)中國工業(yè)自動化市場的多元化需求。
集團在上海設(shè)立了應(yīng)答中心,將逐步建立一個完善的設(shè)有系統(tǒng)專家,服務(wù)網(wǎng)路遍布全中國,24小時365天全年無休的迅速響應(yīng)系統(tǒng),隨時滿足顧客的各種需求。橫河電機(中國)有限公司集中了中國各分公司的技術(shù)資源,強化工程隊伍,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,有綜合競爭力的工程技術(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.