The pH is a quantitative unit of measurement that describes the acidity and alkalinity of a substance. The pH value states the relative quantity of hydrogen ions contained in a solution. The greater the concentration of hydrogen creates an acidic solution, and the lower the pH creates an alkaline solution. In practice, it is the hydrogen ion activity which is measured rather than the concentration.
The way pH values are measured is by taking an electrical signal and converting to a pH reading. A standard pH measuring system consists of three elements, pH electrode, temperature compensation element, and pH meter or controller. The use of pH measurement is in a variety of applications, like agriculture, industrial processes, environmental monitoring, wastewater treatment, and in research and development.
Measuring pH involves comparing the potential of solutions with unknown hydrogen count, to a known reference potential. pH meters will convert a voltage ratio between a reference half-cell and a sensing half-cell then to pH values. Most electrodes are combination electrodes which have both the reference and sensing half-cells in the same body. The difference between the reference and measuring electrodes is a function of the pH value of a solution. The pH can be measured by measuring the voltage which is produced between two special electrodes immersed in the liquid solution used to measure. One electrode, made of special glass (measurement electrode) has a job to generate a small voltage which is proportional to pH. The other electrode (reference electrode) uses a porous junction between the measured liquid and a stable, neutral pH buffer solution (usually potassium chloride) creating a zero-voltage electrical connection to this liquid. This provides continuity to create a complete circuit so that the voltage produced across the thickness of the glass in the measurement electrode can be measured by an external voltmeter.
pH measuring is being used in such a variety of applications, an increasing number of companies all over the world now perform pH testing on their products. Many companies are now noticing that they are wasting time and resources during this testing process. For repeatable and reliable pH testing, this requires following a strict protocol that is hard to achieve in a manual setting, especially having to repeat this process multiple times daily. Leading firms are consolidating their testing expenditure and their labor costs by turning to automated pH measurement systems that expedite this process. These automated pH measurement systems require no effort and leave no room for issues or accidents in testing.