What signal does a pH probe output?

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Prepare for the NRCC Instrumentation Test. Study with flashcards and multiple-choice questions, each complemented with hints and explanations. Gear up for your exam success!

Multiple Choice

What signal does a pH probe output?

Explanation:
A pH probe produces a small voltage difference between its sensing electrode and a stable reference electrode. This electrochemical potential comes from hydrogen ion activity at the glass membrane and shifts as the pH changes. The meter reads this differential voltage in millivolts and then converts it to pH (roughly 59 mV per pH unit at room temperature). So the signal is a differential voltage in millivolts that carries the pH information, not a current or any humidity measurement.

A pH probe produces a small voltage difference between its sensing electrode and a stable reference electrode. This electrochemical potential comes from hydrogen ion activity at the glass membrane and shifts as the pH changes. The meter reads this differential voltage in millivolts and then converts it to pH (roughly 59 mV per pH unit at room temperature). So the signal is a differential voltage in millivolts that carries the pH information, not a current or any humidity measurement.

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