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Simple pH Meter using LM7912

2015-01-08 17:13  
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pH Meter Circuit

pH meter measures the voltage (the EMF, electromotive force) generated by the pH electrodes (the sensor) to show the hydrogen concentration in pH scale. Basically, a pH meter is nothing more than a pH probe/sensor with high impedance voltmeter that measures the generated voltage at the pH probe. To measure the pH with a standard digital voltmeter (DVM), all you need is just a pre-amplifier that provide the high impedance interface with the gain that match the pH-Voltage conversion factor. Here is one example of pH meter circuit diagram:

ph meter circuit circuit schematic

pH Meter Calibration

Before the pH meter can be used, it should be calibrated first. Here is the steps to calibrate this pH meter circuit:

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