What are the benefits of a solid reference junction?
Issues involving the premature failure of pH sensors are related to the sensor’s liquid junction. Industry pundits put the figure at around 80-90%. The pH sensor liquid junction fails due to the coating of the porous junction or what is known as the poisoning of the reference electrolyte. Once the reference electrode has been compromised the measuring electrode no longer has a reference or pre-determined known measurement to compare to.
A solid pH reference junction is an important component of a pH sensor, as it is responsible for maintaining a stable reference potential in the sensor. The reference potential is used as a reference point against which the potential of the measuring electrode is compared in order to determine the pH of the solution being measured.
There are several reasons why a solid pH reference junction is important:
- Accuracy: A stable reference potential is essential for accurate pH measurements. If the reference potential is not stable, it can lead to errors in the pH measurement.
- Repeatability: A solid pH reference junction provides consistent and repeatable measurements over time. This is important for applications where the pH needs to be monitored continuously or over a long period of time.
- Temperature stability: A solid pH reference junction is relatively insensitive to temperature changes, which is important for applications where the temperature may vary.
- Chemical stability: A solid pH reference junction is resistant to chemical attack, which is important for applications where the sensor may be exposed to aggressive chemicals.
- Each sensor type has its own set of advantages and limitations, and the appropriate type will depend on the specific application.
The Nexus® solid pH polymer reference junctions are an excellent choice for tough industrial applications.
Learn more about Nexus® solid pH polymer reference junctions
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