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pH Measurement Checklist

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Check these for elements for proper pH measurements: meter, electrode, buffer, and sample.

pH Meter

  • Confirm the meter settings are correct.
  • Confirm that your temperature sensor is connected (if required).
  • Check that the batteries & power cord are in good working order.
  • Check that the electrode connection is secure.
  • Calibrate frequently to at least 2 points with fresh buffers.

Replace if the meter does not turn on or shows signs of severe wear.

Always remember to reference your manual

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Electrode

  • Inspect your electrode cord and connection for damage.
  • Check that the meter connection is secure.
  • Inspect the pH bulb for scratches.
  • Confirm the pH bulb isn’t broken.
  • Use cleaning solution to ensure electrode bulb & junction are clean.
  • Use storage solution to ensure the electrode is hydrated.
  • Use the correct electrode type for sample being tested.

Replace if electrode won’t stabilise, calibrate or is broken or scratched.

Place in storage solution at least 1 hour or overnight to fully hydrate

pH Buffers

  • Stir buffer with magnetic stirrer or probe.
  • Confirm you are using the correct pH calibration buffer.
  • Inspect your buffers for visible contamination.
  • Use fresh buffer for calibration.
  • Confirm buffer is not expired or bottle has not been opened for more than 4-8 weeks; or 1-2 weeks for buffer > pH 7.

Replace buffers if contamination is present, they are expired or have been opened for too long.

You should “bracket” your expected result e.g.: if the expected result = pH 5, use buffers pH 4.01 and pH 7.01.

Sample

  • Stir sample with magnetic stirrer or probe.
  • Confirm you have enough sample to cover the electrode bulb and junction.
  • Confirm the temperature of your sample will not damage electrode.
  • Sample is appropriate for probe type
  • Sample is fresh and representative of the process/product.

Clean Regularly | Calibrate Often | Condition Always

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