Online Instrumentation - WTW.com

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18 Online pH/ORP Measurement Measuring · Monitoring · Controlling pH is one of the most important analysis parameters measured through out the water, wastewater and many process industries. In the biological treatment of wastewaters, for example, the acidic or alkaline condition of the mixed liquor has an essential influence on the activity of the microorganisms; i.e., continuous online pH control is required. Precise and reliable systems for pH monitoring and control are also necessary in drinking water plants and in a variety of industrial process tech no lo gies. Over the last 50 years, WTW have been designing and manufacturing precision systems for pH measurement. WTW’s technical expertise and long experience in this field are the reason that our on-line pH instruments are now recognized for their excellent performance, reliability and product quality. Online pH/ORP • Wastewater Treatment Facilities • Water Treatment Utilities • Neutralization Plants • Surface Waters and Groundwater • Food Industry • Chemical Production • Industrial Processes For information visit www.WTW.com for a customer care center near you
For information visit www.WTW.com for a customer care center near you pH/ORP Measurement Neutralization/Precipitation/Detoxification Both in water and wastewater treatment and also in industrial processes pH is of great practical importance. The acidity or alkalinity of a process medium plays a key role in many chemical or biological reactions as well as in mechanical/physical actions. A number of reactions – in precipitation and detoxification, for example – may only take place if the pH condition is properly controlled. A “misadjusted” pH can cause a variety of serious effects, of which corrosion is the most common. Therefore, at a low or high pH, neutralization treatment often is required. In the area of municipal and industrial wastewater treatment extreme pH conditions may result in the following harmful effects: • Microorganisms in biological purification processes are sensitive to acidic and alkaline conditions. Therefore, the pH of the sewage is supposed to be in the neutral range of pH 7. At pH levels of less than 5 or more than 10 the activity of the bacteria practically ceases. • pH values of 6.5 and lower result in gradual destruction of metallic materials and mechanical components, and even in damage of the sewer network. • The solubility of many substances varies with the pH level and temperature. Undesirable and obstructive precipitation of solids may be the result. Today’s legislative regulations and environmetal directives in many countries already require that trade effluents may only be discharged into municipal sewer systems if the pH is between 6.5 and 8.5. For this reason, industrial dischargers, for instance, breweries and dairies, often have to pretreat its effluent in a neutralization plant. pH Control System Neutralization, precipitation and detoxification not only require continuous pH measurement but also an efficient pH control system. In less demanding applications, such as stable processes with slowly changing conditions, a simplified 2-point logic control may be adequate. In many cases, how ever, a proportional control loop is considerably more efficient and also economical with regard to dosing of flocculants or neutralization chemicals. pH measuring technology by WTW WTW’s complete line of pH/ORP instrumentation comprises sensor assemblies, monitors and system components for a wide range of applications. In addition to the well proven SensoLyt ® sensor assemblies, which are widely used in wastewater facilities, the product line includes ruggedized sensor assemblies for in-line measurements in industrial processes. The proven monitors of the 170 and 296 series have a PIF control algorithm. A special measuring transducer as well as sensors and accessories are available for use in explosionproof areas (see brochure “Product Details”). The IQ SenSor net and the IQ sensors open up a whole new realm of technology with features such as an immense degree of flexibility and “sensors which can be pre-calibrated in the laboratory”. Parameter section Conductivity pH/ORP Dissolved Oxygen Nitrogen Turbidity/ Suspended Solids Sludge level Phosphate Carbon: COD/TOC/ DOC/BOD/SAC 19
Page 1 and 2: Online Instrumentation D.O. · pH
Page 3 and 4: Parameter see catalog page 9 8 20 3
Page 5 and 6: Publisher Wissenschaftlich-Technisc
Page 7 and 8: NEW New Instruments is growing …
Page 9 and 10: NEW MIQ/MC2 The new controller fami
Page 11 and 12: D.O. Monitoring and Control In the
Page 13 and 14: The electrochemical sensors of the
Page 15 and 16: 4 2 3 2 For information visit www.W
Page 17 and 18: Self-diagnosis system All parts bei
Page 19 and 20: Technical Data digital D.O. Sensors
Page 21: Technical Data analog D.O. Sensors
Page 25 and 26: SensoLyt ® Combination Electrodes
Page 27 and 28: Technical Data SensoLyt ® digital
Page 29 and 30: CHEMtrac Valve Assemblies For infor
Page 31 and 32: Configuration Guide digital pH/ORP
Page 33 and 34: Conductivity Conductivity Ranges of
Page 35 and 36: TetraCon ® 4-electrode Design The
Page 37 and 38: Configuration Guide digital conduct
Page 39 and 40: Optical unit with ultrasonic cleani
Page 41 and 42: VisoTurb ® and ViSolid ® - new se
Page 43 and 44: Suspended Solids Sensor ViSolid ®
Page 45 and 46: Wastewater: nitrogen sources Norgan
Page 47 and 48: WTW Measuring Systems for Nitrogen
Page 49 and 50: NEW WTW Spectral sensors • In-sit
Page 51 and 52: IQ-LabLink With the initial install
Page 53 and 54: IQ-LabLink With the initial install
Page 55 and 56: NitraLyt ® Plus • In-situ nitrat
Page 57 and 58: NEW Optical in-situ measurement of
Page 59 and 60: Technical Data ON 210/OS 210 Measur
Page 61 and 62: Carbon Carbon The main task of a wa
Page 63 and 64: Applications The most important mea
Page 65 and 66: Technical Data CarboVis ® /NiCaVis
Page 67 and 68: Measuring Methods and Digestion The
Page 69 and 70: The benefits at a glance: • On-si
Page 71 and 72: Filtration P 700 IQ • Compact des
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Online P Total measurement • Moni
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NEW Efficient sludge control and mo
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Accessories Special equipment for s
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I Q S e n S o r n e t System Philos
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Features and functions of the I Q S
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I Q S e n S o r n e t system techno
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IQ Sensors One connection for all I
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control Schaltwarte room System arc
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Terminal / Controller MIQ/TC 2020 X
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Electronic-Key function For informa
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Housings of the new MIQ/MC2 family
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System components and functions Ter
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Configuration and Performance Data
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Configuration Options for System 18
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For information visit www.WTW.com f
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Configuration Guide TriOxmatic ® 6
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Technical Data EcoLine Oxi 170 / Qu
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Technical Data EcoLine LF 170 / Qua
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For this reason analyzers are so fa
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1 System Controller Module Equipped
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TC/PU 1 Two-Channel Permeate Switch
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The Instruments include: • big gr
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Biological Treatment PurCon ® •
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Secondary Sedimentation Stage / Fin
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WTW has added two new units for pre
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Sampling Mobile Operation Applicati
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PB 150-SE • Vacuum technology for
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PB 25 S / PB 25 S/24 • Compact
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Junction Boxes Analog KI/S Order No
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Mounting Stands and Fixtures Detail
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Fixtures Sun Shields BE/R 170 Order
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Flow-thru Adapters SW Flow-thru Ves
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Retractable Armatures • For press
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Cleaning Air Box • Oilfree comp
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Instruments for measuring turbidity
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Typical Applications * North Americ
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For the measuring and control of wa
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Index A Page Accessories 124 ADA-DF
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WTW Online Instrumentation at the W
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