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Designing with pH electrodes

Posted: 04 Jun 2009 ?? ?Print Version ?Bookmark and Share

Keywords:ph electrode? sensor? electrode circuit?

The pH electrode is a temperature-dependent bipolar sensor that has a very large source impedance. These design challenges are handled with level shifting and temperature compensation in a single-supply pH-electrode circuit. When deciding on an amplifier to use in this circuit, it is important to understand that using an amplifier with a low bias current is of utmost importance.

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