Description
The pH meter is calibrated with solutions of known pH, typically before each use, to ensure accuracy of measurement. To measure the pH of a solution, the electrodes are used as probes, which are dipped into the test solutions and held there sufficiently long for the hydrogen ions in the test solution to equilibrate with the ions on the surface of the bulb on the glass electrode.
It provides a known reference potential for the pH electrode. The difference in the potentials of the pH and reference electrodes provides a milli volt. signal proportional to pH. Most pH sensors are designed to produce a 0 mV signal at 7.0 pH, with a slope of pH at 25°C.
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