A laboratory pH sensor is used to determine the alkalinity or acidity of a sample both in the lab and in the field. METTLER TOLEDO offers reliable pH electrodes and probes that provide accurate readings for a wide range of applications in industries such as pharma, biotechnology, F&B, or chemical. We have a broad portfolio that includes built-in temperature probes and low-maintenance options, and our Intelligent Sensor Management (ISM®) enhances data security and makes handling easy.
Reproducible pH results begin with a high-quality pH sensor that is designed for a particular lab or field application. From routine measurements to specialized applications in the chemical, pharmaceutical, life science, and food and beverage industries, we have the right lab pH probe for you.
Sensor readings must be fast, accurate and reproducible. High-quality materials in combination with tried and trusted technologies such as the particular reference system or shape and composition of the glass membrane optimize our lab pH electrodes to meet the requirements of your particular application. pH sensors with integrated temperature probes ensure correct temperature compensation.
Not only do our lab pH sensors ensure high performance, but a correct pairing of materials and technologies makes them more durable and extends their working lifetime. We offer special shaft materials that ensure a long work life even in harsh environments near production lines.
Our low-maintenance sensors are always ready to use due to their gel or solid reference system that makes refilling superfluous. Lab pH sensors with an adjustable sleeve-junction enable easy and thorough cleaning. In addition, our Intelligent Sensor Management system (ISM®) allows for quick and easy setup as our meters automatically detect the connected pH electrode.
With the Intelligent Sensor Management (ISM®) technology, a pH meter automatically detects the connected probe, using the most up-to-date calibration data stored. This ensures safe, accurate, and traceable results. In addition, all of our lab and field pH sensors come with a certificate of analysis.
Since 1948, METTLER TOLEDO has amassed a deep expertise in providing precision sensors and high-quality solutions for use both in the laboratory and the field. In fact, METTLER TOLEDO had its first success with the combination glass pH electrode invented by Dr. Werner Ingold. His innovative design simplifies the way the world measures pH to this day.
METTLER TOLEDO provides complete electrochemistry systems from meters and sensors to calibration solutions and software. Benefit from the Intelligent Sensor Management (ISM®) technology to support data compliance or from automatic temperature compensation for accurate results.
We support and service your measurement equipment through its entire life-cycle, from installation to preventive maintenance and calibration to equipment repair.
pH is a property associated predominantly with aqueous solutions. Therefore, conventional sensors designed to measure pH in aqueous media fail to measure pH accurately in non-aqueous solutions. However, our specialized InLab® Sensors such as InLab Science Pro-ISM are designed for these types of specialized applications, making it possible to measure the pH of non-aqueous solutions, organic solvents, solids, and semi-solids with ease. Therefore, METTLER TOLEDO's pH meters and sensors can be used to measure the pH of a wide variety of samples.
The expected outflow of a reference electrolyte is:
a. 1 mL per 24 hours for electrodes with a ceramic diaphragm (e.g. InLab® Routine)
b. 3 mL per 24 hours for electrodes with a sleeve diaphragm (e.g. InLab Science)
Electrodes with solid state electrolyte and an open junction (e.g. InLab Expert) have no outflow but only "exchange" ions via diffusion.
In order to prevent the stripping of Ag from Ag wire, the ARGENTHAL™ reference element was created. The specialized ARGENTHAL reference element consists of a small cartridge filled with AgCl particles that provide the silver ions for the chemical reaction at the lead-off wire. This cartridge contains enough AgCl to last the lifetime of the electrode.
In sensors with ISM® functionality, important information stored on a chip in the sensor is automatically detected by the meter for easier measurements and recordkeeping. These include:
These sensors are only compatible with SevenExcellence™, SevenCompact™, Seven2Go Pro™ and SevenGo Duo™ meters.
Temperature has an influence on both the electrode and the sample. Following the Nernst equation, the measured pH andslope linearly depend on temperature. The sample measurement cannot be compensated to any reference temperature, because every sample has its own pH–temperature dependence. During the measurement only the slope is adjusted to the temperature of the measurement. The result is displayed only for the temperature of the measurement. Only pH calibration buffers’ behavior is fully predictable and can be compensated by using an electrode with an integrated temperature sensor.
Yes, our pH meters have a BNC socket that can support third party sensors with BNC connectors. However, some specialized features such as ISM may not work.
Check out the following video to learn inspection techniques.
The purity of water is an important aspect in many industries and sectors such as pharmaceutical, food and beverage, life science, power plants, and many others where pure water is required for day-to-day laboratory testing and other activities. The pH measurement of pure water samples can be difficult due to the low conductivity of the sample, fluctuations in electrode liquid junction potential, and glass membranes sensitivity. With our specialized pH sensors, it is possible to measure the pH of pure water samples. Watch this video to learn more or check out our sensor here.
Yes, METTLER TOLEDO offers an array of specialized sensors for measuring the pH of various foods and beverages. To learn more, click here.
The pH-sensitive glass membrane can be reactivated using a regeneration solution. This solution contains ammonium bifluoride. All the necessary safety precautions must be taken while handling these acids, e.g. wear protective goggles, a laboratory coat and chemical-resistant gloves.
Please refer to our troubleshooting video showing the step-by-step process of pH sensor regeneration.