pH measurement with SenTix® electrodes

pH measurement

pH measurement is one of the most important and common measurements in the laboratory, the field and all water-based processes. The pH value describes the activity of the H+ ions, or how acidic or alkaline a solution is. The higher the activity, the lower the pH and the more acidic the solution and vice versa. The scale ranges from 0 to 14, with 7 being the so-called neutral point, which means that H+ and OH- show the same activity. The pH value is crucial for many biological, biochemical and chemical processes, its precise measurement is our concern!

The right sensors for every application

No two pH measurements are the same. The demands placed on pH measurement can therefore only be met by application-oriented and perfectly coordinated systems consisting of electrodes, measuring devices and buffer solutions, such as the ones we supply. A crucial component in this system is the pH electrode, which is in direct contact with the sample and delivers the measurement signal.

We have been developing and manufacturing glass electrodes for over 80 years - know-how from which you as a customer benefit. Whether for ultrapure water, jam, wine, creams or drinking water – we offer the right electrode for every conceivable application.

• Low-resistance membrane glasses guarantee stable measurement signals even at low temperatures
• Silver ion-free reference electrolyte in conjunction with the unique platinum wire diaphragm in a large number of our laboratory electrodes prevents measuring problems caused by failing silver compounds
• Functional slider for opening and safely closing the refill opening for electrodes with liquid electrolyte.
• Connection options: waterproof DIN plug, BNC plug, fixed cable (1 or 3 m) or plug head

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Here you can find out more about choosing the right pH electrode and answers to your questions:

 Blog: Which pH electrode do I need?

 Blog: What is pH?

 Blog: Calibration and adjustment of a pH electrode

Multi-parameter measuring devices for lab and field - digital and analog

Multiparameter measurement in electrochemistry

WTW® is one of the great pioneers with more than 30 years of experience in the multi-parameter measurement of electrochemical parameters such as pH, ORP, conductivity and dissolved oxygen. The advantage for the user is clear: one device - different parameters and sensors. What was originally designed for limnological use is now indispensable in all industries and applications with digital IDS sensors (also wireless) and a selection of laboratory systems and portable devices: The spectrum ranges from measurements in surface waters to quality assurance in pharmaceutical companies. Automatic documentation of all important sensor, device and user data supports GLP (Good Laboratory Practice) in modern measurement operations.

inoLab® Multi IDS lab devices:

The inoLab® Multi IDS measuring devices and IDS sensors – the perfect combination for efficient and precise work in the laboratory. Whether wired or with the new radio modules for IDS plug-in head sensors – reliable measured values with complete documentation of all devices and sensor data are guaranteed. And the MultiLab® user software allows GLP/GMP-compliant user management with different authorization levels. Modern communication interfaces ensure smooth data transfer.

MultiLine® IDS Series: Portable, robust, digital

MultiLine® IDS stands for robust, waterproof and reliable portable devices for mobile measurement. They are available in three different versions to suit every customer requirement - from the reliable entry-level to the professional three-channel measuring device.

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Here you can find out more about choosing the right pH electrode and answers to your questions:

 Blog: Which pH electrode do I need?

 Blog: What is pH?

 Blog: Calibration and adjustment of a pH electrode

Photometry and Turbidity

Photometers are universal measuring tools that are used for everything from research and teaching to environmental and process monitoring. In the environmental sector, for example, they are used to monitor surface and groundwater. In quality control, they are used in the food and beverage industry as well as in drinking water production. The proven and highly precise WTW® photometers can be used for a wide range of these applications. The reason for this is the large selection of commercial test kits, as well as reagent-free methods and the possibility of colour measurement.

The devices in the photoLab® series are also capable of performing the tasks required in research and service laboratories, such as scans, kinetic and multi-wavelength measurements or complex multi-step analyses.

The photoLab® 7600 UV-VIS spectrophotometer adds reagent-free COD, nitrate and nitrite measurement via OptRF to the comprehensive range of proven routine measurements.  It can also determine important parameters such as UVT and SAC and carry out extensive colour measurements. As lightweight devices, the photoLab® series can also be used on the move with a car battery.

The robust and intuitive photometers in the photoFlex® series are particularly impressive in the field. From the simple photometer to the "Swiss army knife", which combines 4 devices in one multi-parameter device, these are ideal for all applications that require mobility and versatility.     

Turbidity is a subjective, optical impression and therefore not as clearly determinable as the photometric parameters, for example, but rather an effect caused by the scattering and absorption of light. Nevertheless, turbidity has proven to be an important parameter for quality assessment and control. Turbidity measurement has long been used worldwide in drinking water to determine quality for human consumption. A standardised measurement method for reliable quantification has been developed for this purpose: The measurement method used today in drinking water with a scattered light measurement of 90° is known as nephelometric turbidity measurement and is described in the two standards DIN EN ISO 7027-1 and US EPA 180.1. However, methods of turbidity measurement have also been established in the medical/pharmaceutical sector and in food production, e.g. to monitor production processes or shelf life. In wastewater treatment, turbidity measurement is used as an indicator for mass loading.

Xylem Analytics offers proven, high-precision WTW turbidimeters for the various applications of turbidity measurement. From quality monitoring in the laboratory to environmental monitoring in the field.

The WTW Turb® 750 IR and Turb® 750 T fulfil the requirements of many laboratory and industrial applications for AQA-supported turbidity measurement. With the help of the Intelligent Reproducibility and Plausibility Check (IRPC), they deliver highly precise measurement results. Low space requirements, an excellent range of functions and an unbeatable price/performance ratio make the Turb® 750 series the ideal measuring instruments for every laboratory.

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You can read more about photometry from our experts in our blog::

 Blog: The Basics of Photometric Measurement

Dataloggers for validation and routine monitoring

Constant monitoring of physical variables such as temperature, pressure or relative humidity with dataloggers

In many areas of the manufacturing industry, continuous monitoring of physical variables such as temperature, pressure or relative humidity is essential. With a data logger as a special measuring device, relevant measured values can be permanently recorded and evaluated, which are easily transferred and clearly displayed thanks to modern computer technology. Our portfolio includes a variety of modern data loggers whose functions and technical properties cover a wide range of applications. The spectrum ranges from simple but reliable standard temperature loggers, to USB data loggers with PDF functions, radio loggers for automatic monitoring, to highly accurate and extremely robust validation loggers for steam sterilizers. With our practice-oriented softwares, evaluating the data and generating reports is child's play. Together, these various components create complete solutions for almost all temperature-dependent applications in food and pharmaceuticals.

The following processes can be monitored with our dataloggers: control of sterilizers and washer-disinfectors; monitoring the cold chain during transport, storage and incoming goods inspection of food and pharmaceuticals; sample analysis in the laboratory

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Titration

Titration is one of the oldest methods for content determination in chemistry. In contrast to gravimetry, no sparingly soluble compounds are dried and weighed, but a reagent of known concentration is added to the dissolved sample until the chemical conversion is complete. Titration finds broad use in chemical analysis. On the one hand, a titration can be performed very easily and quickly. On the other hand, titration provides a very accurate measurement result after only a few minutes - under optimal conditions.

SI Analytics® titration devices have been known for more than 45 years for their high accuracy, robustness and flexibility.

The product portfolio ranges from the simple TITRONIC® 300 piston burette for simple dosing tasks and manual titration to the TitroLine® 7800 / TitroLine® 7800 -TitriSoft with sample changer TW 7200 for complex titration tasks and TitroLine® 7500 KF trace with headspace oven/sampler TO 7280/TW 7650 for fully automatic water determination according to Karl Fischer.

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You can read more about titration from our experts in our blog::

 Blog: Maintenance and care of titration electrodes

 Blog: Which electrodes can still be used for titration??

 Blog: Which pH electrode do I need for my acid-base titration application?

Digital Refractometry & Polarimetry

Bellingham + Stanley, a Xylem brand, offers one of the largest selections of digital refractometers in the world. All refractometers are manufactured to the highest standards and are directly supported by a team of experts and a global network of highly trained dealers with 100 years of experience. Bellingham + Stanley refractometers are available for a range of applications and industry types including (but not limited to) food and beverage, chemical and petrochemical, pharmaceutical and academia. Whether it's a simple portable optical or digital handheld refractometer or a precision Peltier temperature-controlled benchtop laboratory instrument, we have the right product for you.

We also produce high quality polarimeters which offer the latest optical, electrical and mechanical design principles to deliver an instrument that is both reliable and easy to use. Bellingham + Stanley polarimeters can be found in a variety of applications from research to academic research, testing chiral compounds, optically active chemicals or raw materials, finished pharmaceuticals, sugar purity in the laboratory and even in the confectionery industry to control concentration or mixing ratio of different types of sugar.

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Viscometry

SI Analytics®, a brand of Xylem, formerly SCHOTT®-Geräte and SCHOTT®-Instruments, is a world-renowned manufacturer of glass capillary viscometers and automatic measuring instruments for viscometry. The product range initially comprises a variety of different and high-quality capillary viscometers made of DURAN® glass, which comply with the relevant DIN, ISO and ASTM standards. After production, our viscometers are calibrated by direct comparison with reference viscometers from the Physikalisch-Technische Bundesanstalt. The devices for automated measurement range from automatic time measurement (ViscoClock plus) to automated pumping in the viscometer (AVS®), working with a cleaning/waste system and PC control (AVS® 370) up to the fully automatic AVS®Pro III with sample changer. Accessories, e.g. for sample preparation, round off the portfolio.

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