pH Meter
pH meters measure the hydrogen ion concentration of liquids electrochemically, thereby determining their pH value. They are indispensable measuring instruments in laboratories and process control.
Product
pH Meter
pH meters measure the hydrogen ion concentration of liquids electrochemically, thereby determining their pH value. They are indispensable measuring instruments in laboratories and process control.
Suppliers
The following suppliers offer pH Meter products.
Suppliers enabled for requests
Blanc-Labo SA
Huberlab AG
IGZ Instruments AG
Labgene Scientific SA
Mettler-Toledo (Schweiz) GmbH
Milian SA
Thermo Fisher Scientific (Schweiz) AG
You can send a request to the suppliers listed above and save time. Describe your requirements and the request will be forwarded to the selected suppliers. They will contact you with suitable proposals without any obligation.
Guide and selection support
pH meters are used to precisely determine the acid-base status of aqueous solutions. This is important in many fields such as chemistry, biotechnology, and environmental analysis.
When choosing a device, measurement accuracy, ease of use, measuring range, and electrode type play crucial roles. Calibration capability and compatibility with different types of fluids are equally important.
LabFinder provides an overview of suitable pH meters in various versions, making it easier to find the right device for specific requirements.
Application and Benefits
A pH meter is used for the precise determination of the pH value of a solution, i.e., the concentration of hydrogen ions (H⁺). This is carried out electrochemically using a pH electrode, enabling a direct and quantifiable indication of the acid-base ratio. The measuring instrument is applied in laboratory environments of many disciplines, such as chemistry, biotechnology, environmental analysis, or food production.
Selection Criteria
Key factors when choosing a pH meter include measuring range, accuracy, and repeatability of measurement. Devices also differ in the type of pH electrode, measuring mode (benchtop or portable), as well as ease of use and calibration options. Compatibility with the sample, for example for highly conductive or contaminated liquids, is also important.
Variants and Measurement Principles
The fundamental principle of a pH meter is the measurement of the electrochemical potential between a measuring electrode and a reference electrode in the sample. Portable handheld units, benchtop instruments with higher accuracy, and integrated pH sensors for lab automation or inline process measurement are available. Electrodes may be constructed differently depending on the application—for example, with glass or plastic membranes.
Calibration and Maintenance
Regular calibration with standardized buffer solutions is required for valid and precise measurement results. The electrode also needs to be cared for and occasionally cleaned or replaced to avoid measurement errors. The device's operating manual provides guidance on optimal care and calibration.
Limitations of Use
pH meters are designed for aqueous solutions and may lose accuracy with highly conductive or heterogeneous samples. They are less suitable for non-conductive or highly contaminated media where the electrode cannot function properly. Correct handling and calibration are essential.
Search Terms and Related Concepts
Synonyms for pH meter include pH measuring device, acid-base meter, hydrogen ion meter, pH electrode, or pH electrometer. Important technical terms in this context are pH value, electrochemical measurement, measuring device, sensor, electrode, and acid-base indicator. pH meters are often used alongside conductivity meters or densitometers during liquid analysis.
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Frequently asked questions
How does a pH meter work?
A pH meter measures the potential difference between a measuring electrode and a reference electrode in the liquid. This voltage is proportional to the pH value—the concentration of hydrogen ions.
What types of pH meters are there?
Fundamentally, there are portable handheld devices, stationary benchtop devices, and integrated sensors. The choice depends on the application area and requirements for accuracy and ease of use.
What should I consider when choosing a pH meter?
Key factors are measuring range, accuracy, type and compatibility of the electrode, calibration options, and ease of use. The nature of the sample liquid should also be considered.
How important is the calibration of a pH meter?
Regular calibration with buffer solutions is essential to ensure accurate and reproducible measurement results. Without calibration, the instrument may provide incorrect readings.
For which samples are pH meters less suitable?
Measurement accuracy can be limited with highly conductive, non-conductive, very dirty, or heterogeneous samples. In such cases, special electrodes or alternative measurement methods may be required.
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