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横河SC29C-PTC55传感器 PH计SC29C-PTC55横河
横河电机有限公司创建于1915年,总部设在日本东京。在世界29个地区拥有60多家子公司。经营领域涉及测量、控制、信息三大领域,在工业控制行业是zui为专业的跨国公司之一。1975年*研制出世界上*套具有划时代意义的集散型控制系统(DCS系统),对石油、化工等大型工厂的生产过程进行测量、运行监视和控制,为工业的发展和社会的进步做出了*贡献,到目前已相继推出了7代CENTUM DCS系列产品,流量表、变送器、分析仪等现场仪表也得到了用户的高度评价
横河电机是同行业中zui早进入中国的外资企业,在1979年开设了北京驻在员事务所,1985年与中国建立了*个合资公司,横河西仪有限公司。2002年10月在位于苏州的苏州新加坡工业园区内设立了*独资的“横河电机(苏州)有限公司”,工厂总面积13.5万平方米,目前投入生产使用的*工厂面积为2.5万平方米,生产流量计,记录仪等,其所设立的流量标定系统zui大可标定2.6米口径的流量计,是世界zui大规模的标定系统。2006年1月1日,“横河电机中国商贸有限公司”成立,该公司作为具有销售、市场开发、工程技术服务的横河集团的中坚企业,与已经活跃在中国国内市场上的集团中另外8家公司协力,大力开拓中国市场。2008年2月1日,为了扩大在中国工业自动化领域的业务,取得更大的*,横河电机集团对旗下中国三家相关公司的业务进行整合,成立新的法人企业“横河电机(中国)有限公司”,作为在中国的统括公司,通过强化销售、、工程、售后服务等方面职能,来适应中国工业自动化市场的多元化需求。
集团在上海设立了应答中心,将逐步建立一个完善的设有系统专家,服务网路遍布全中国,24小时365天全年无休的迅速响应系统,随时满足顾客的各种需求。横河电机(中国)有限公司集中了中国各分公司的技术资源,强化工程队伍,确立了在石油、天然气、化工、能源、钢铁等行业能够提供优质的,有综合竞争力的工程技术业务体制。
适应整个产业界正不断深入的化和信息化这一时代变革的要求,横河电机为了向用户展示其重视系统产品的可靠性、安全性、前瞻性这一姿态,提出了VigilantPlant的企业理念,在测量领域,针对分析、品质管理、传感器、操作端提出解决方案;在控制领域包括生产控制、安全管理、以及数据收集和逻辑控制;*化领域则包括生产管理、*控制、资产管理、操作支援这几部分。遵从这一企业理念,横河电机运用*技术,不断开拓新产品,力争为工业化社会做出更大贡献
SM29氧化还原电极
SM29 Redox Electrodes
Redox measurements are a potentiometrical measurement of the oxidizing/reducing power of a liquid. To be able to measure this equilibrium of reversible redox reactions the electrodes used should be inert. Noble electrodes such as Platinum (Pt) and Gold (Au) are widely used for this purpose and seem to approximate the behaviour of an ideal inert electrode. Platinum is used most widely, has excellent chemical resistance but suffers slightly from chemosorption of Oxygen, which slows down its response.
The potential of reference electrodes is depending on their
composition. A table with the actual values for each system is given next. All values refer to 25°C. The reference system is also indicated on the textplate of the electrode.
System | Fill solution | Value against Standard Hydrogen Electrode |
Ag/AgCl | 3.3 m. KCl | 203 mV |
Ag/AgCl | sat. KCl | 196 mV |
Combined Redox Electrodes
For redox measurement Yokogawa offers non-flow general purpose electrodes and a heavy duty flow electrode. All electrodes are equiped with a solid platinum pin to provide long
lifetime, even in processes that harm the platinum electrodes such as hypochloride.
METAL ELECTRODES
l Polarisation free measurement by (patented) inert metal surface.
l Dome shaped cup
l Temperature range 0…130°C
l Steam sterilisable.
l Maximum process pressure: 1 MPa (10 bar)
The Redox (ORP) electrode can be used in combination with all
reference electrodes in the program of Yokogawa.
The potential of reference electrodes is depending on their
composition.
A table with the actual values for each system is given next. All
values refer to 25°C
System | Fitting | Absolute value | Value against SCE |
Ag/AgCl Ag/AgCl Calomel (SME) | 1 m KCl sat. KCl sat. KCl | 233 mV 188 mV 241 mV | - 8 mV - 45 mV 0 mV |
The reference system is also indicated on the textplate of the electrode
SC24V Differential pH sensor
The SC24V it a differential pH sensor. This means that the reference is not a (liquid) junction but a glass sensor which does not respond to pH changes (within the applicable range of the sensor). Therefore the sensor is truly maintenance free and the output voltage of the sensor depends only on the salt concentration of the process.
The sensor responds to pH changes rather than analyzes the accurate pH value. In that sense it is best to describe the sensor as pH control sensor rather than pH measuring sensor.
A pH sensor measures the voltage that the pH membrane measures as function of the pH value of the process sample. This voltage is then compared with the mV output of a reference cell that is independent on the pH value of the sensor
In most pH control applications the salt concentration is rather constant, so the output of the SC24V differential sensor is only dependent on the pH of the process.
A rule of thumb is that a change in salt concentration of +/- 25%
has an effect of less than 0.1pH on the pH reading.
Model | Suffix Code | Option Code | Description |
SC24V
Sensor |
-ALN26 |
| Combined 12mm 4 in 1 differential pHsensor with Variopin connector Ag/AgCl reference system, pH half cell L-glass, reference cell salt sensitive glass, non-flow, heavy duty |
Sensor length | -120 -225 | 120mm 225mm |
Features
• VP connector
• Sterilizable pH sensor
• No reference electrode or junction
• Maintenance free pH sensor
• No diffusion = high stability
PH计,是一种常用的仪器设备,主要用来精密测量液体介质的酸碱度值,配上相应的离子选择电极也可以测量离子电极电位MV值,广泛应用于工业、农业、科研、环保等领域。该仪器也是食品厂、饮用水厂办QS、HACCP认证中的*检验设备。
人们根据生产与生活的需要,科学地研究生产了许多型号的酸度计:
按测量精度
可分0.2级、0.1级、0.01级或更高精度。
按仪器体积
分有笔式(迷你型)、便携式、台式还有在线连续监控测量的在线式。
根据使用的要求
笔式(迷你型)与便携式pH酸碱度计一般是检测人员带到现场检测使用。
选择pH酸碱度计的精度级别是根据用户测量所需的精度决定,而后根据用户方便使用而选择各式形状的pH计。