Laboratory pH Sensor
Accurate pH Electrodes and Probes for a Wide Range of Laboratory and Field Applications
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.
Advantages of METTLER TOLEDO's Laboratory pH Sensors
Find Your Lab pH Sensor Easily
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.
Get Trustworthy Results
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.
Built to Last
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.
Simplify Sensor Care and Setup
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.
Ensure Safe and Accurate Results
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.
A Long Tradition of Precision
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.
A Complete System Provider
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.
Useful Related Links
Reliable Meters
We offer a variety of durable benchtop and portable meters to meet your needs for compliance and routine measurement, including economical models for tight budgets. Read more
Quality pH Buffers
pH readings are only as accurate as the solutions used for calibration purposes. We offer a comprehensive range of pH buffers in small bottles or single-use sachets to reduce contamination risk. Read more
Expert Application Support
Our pH Competence and Support Center (pH CSC) offers you easy access to dedicated application specialists for your pH, ORP, ion, conductivity, and DO measurements. These specialists provide know-how to help ensure a high degree of success in all your critical electrochemical analyses. Read more
Good Electrochemistry Practice
Measuring pH in the laboratory is a common and important analysis. Good Electrochemistry Practice™ guides you through the entire product lifecycle to detect potential risks and find the right tools to address them. This helps to ensure that you achieve accuracy in all your critical pH measurements. Read more
Meter and Sensor Accessories
Enhance and customize your measuring system with our range of effective pH accessories to simplify your workflow, reduce error risk and make it easier to obtain the accuracy you need. Each meter has interfaces that allow you to connect multiple pH accessories and peripherals such as printers and stirrers according to your application. Read more
Explore Our Services - Tailored to Fit Your Equipment
We support and service your measurement equipment through its entire life-cycle, from installation to preventive maintenance and calibration to equipment repair.
Support & Repair
FAQs
Can METTLER TOLEDO's laboratory pH sensors be used to measure the pH of aqueous solutions only?
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.
What is the expected flow rate of a reference electrolyte from the lab pH sensor?
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.
What are the advantages of the Argenthal reference system for laboratory pH sensors?
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.
What are ISM lab pH sensors?
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:
- Sensor name and serial number
- The last five calibrations
- Initial factory calibration data
- The maximum temperature the electrode has been exposed to
These sensors are only compatible with SevenExcellence™, SevenCompact™, Seven2Go Pro™ and SevenGo Duo™ meters.
Can the temperature be compensated for when measuring using a laboratory pH electrode?
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.
Can laboratory pH probes from other manufacturers be used with METTLER TOLEDO pH meters?
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.
How should I inspect a new lab pH electrode for completeness and quality?
Check out the following video to learn inspection techniques.
Is it possible to measure the pH of pure water with METTLER TOLEDO's lab pH sensors?
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.
Are there any specialized laboratory pH electrodes for the food and beverage segment?
Yes, METTLER TOLEDO offers an array of specialized sensors for measuring the pH of various foods and beverages. To learn more, click here.
How can a laboratory pH electrode be regenerated?
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.
- Measure a minimum amount of the solution in a small acid-resistant vessel.
- Dip the tip of the pH sensor into the regeneration solution for 5 to 15 minutes.
- Ensure the maximum immersion point is at the level of the upper shoulder of the pH-sensitive glass.
- Never dip the pH sensor shaft into the solution because the hydrofluoric acid will damage it.
- Rinse the pH sensor thoroughly with water and condition it for approximately one hour in a buffer solution of pH 7.
- Finally, place the pH sensor overnight in the specific reference electrolyte.
Please refer to our troubleshooting video showing the step-by-step process of pH sensor regeneration.