Why can't ORP reference solutions and pH reference solutions be used interchangeably for calibration?

Document ID

Document ID TE2054

Published Date

Published Date 05/12/2022
Question
Why can't ORP reference solutions and pH reference solutions be used interchangeably for calibration?
Summary
pH/ORP sensor calibration differences.
Answer
ORP reference solutions and pH buffers are designed specifically for either ORP or pH, but are not interchangeable. ORP sensors by definition use the oxidation-reduction potential of ORP reference solutions, measured in mV. pH sensors by definition use the hydrogen ion concentration to generate a mV signal that is directly related the pH of the sample or buffer solution.

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