What Are pH Sensors Used For?
The acidity or basicity (also known as alkalinity) of a liquid or solution can be measured with the help of pH sensors. A lower pH number indicates that the solution has a higher acidity, whereas a higher pH value indicates that the solution has a higher alkalinity. The pH value is a measure of the concentration of hydrogen ions (H+) in the solution. pH sensors consist of a glass or plastic electrode that is sensitive to H+ ions and a reference electrode that gives a constant voltage for comparison. This allows the sensor to make accurate measurements of the solution’s pH level.
The reference electrode is commonly constructed out of a metal, such as silver or silver chloride, and it is placed in direct contact with a solution whose pH is already known. This solution, which is referred to as the reference electrolyte, is responsible for providing the sensor with a constant voltage that it can utilise to determine the pH of the sample. The sample and the reference electrolyte are connected by a porous glass or ceramic junction, which enables ions to move freely between the reference electrolyte and the sample. The reference electrode is connected to the sensor.
One of the most significant difficulties that might arise with pH sensors is the possibility of the reference electrode being harmed by contaminants present in the sample. This may occur if the sample includes significant concentrations of specific ions, such as chloride or sulphur, that are able to react with the reference electrode and modify the voltage of the electrode as a result. This may result in the sensor providing data that are erroneous and may possibly cause the sensor to become inoperable. It is essential to make use of reference electrodes of a high quality and to ensure that they are kept clean and in good repair in order to avoid the risk of reference poisoning. In order to reduce the likelihood of the reference becoming poisoned, it is essential to make use of a reference electrolyte that is compatible with the sample in question.