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A pH (potential of Hydrogen) measurement reveals if a solution is acidic or alkaline (also base or basic). If the solution has an equal amount of acidic and alkaline molecules, the pH is considered neutral.
ORP stands for Oxidation-Reduction Potential.ORP is a measure of the cleanliness of the water & its ability to break down contaminants.
An ion-selective electrode (ISE), is a or sensor that converts the activity of a specific ion dissolved in a solution into an electrical potential, which can be measured by a ISE meter.
Electrodes can last up to 2 years if properly maintained.
Platinum sensor: use in oxidizing reaction (above 500mV) such as pools & spas, municipal drinking water. Gold sensor: use in reducing environment (below 500mV) such as galvanic applications, mining industry (Cyanide).
Ion-Selective Electrodes are part of a group of relatively simple and inexpensive analytical tools which are commonly referred to as Sensors. The pH electrode is the most well known and simplest member of this group and can be used to illustrate the basic principles of ISEs.
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Reprinted from American Laboratory News February 2004, this article goes over improvements of pH measurement such as the combination electrode, more versatile pH glass, high-performance electrode junctions, and application-specific electrodes.