Ph Meter

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A very important laboratory instrument, the pH meter is used for measuring the pH (acidity or alkalinity) of a liquid. A typical pH meter includes a special measuring probe, which is often a glass electrode connected to an electronic meter that measures and shows the pH reading. Apart from measuring acidity or alkalinity of liquids, sometimes the pH meter is used to measure the pH of semi-solid substances.

The circuit of a simple pH meter normally comprises operational amplifiers in an inverting configuration. The inverting amplifier converts the small voltage generated by the probe into pH units. The pH units are then offset by seven volts to give a reading on the pH scale. A pH meter is among the most popular and most important measuring devices used by chemists and non-chemists in lab, field and industrial environment.