Tag Archives: electrode

Tech Tip: Tips for Smooth-Running pH Testing


Pick the right meter. A pH meter with more than minimum requirements may be the better option. Product requirements and regulations change with time. Meters with advanced features will allow for a wider range of testing and documentation of results.

Know the basics. The meter’s algorithm and displayed value expresses the amount of potential difference between the electrode’s reference to a sample being tested. During the process of electrode equilibrium (or end-point), a blockage or slowing of an electrode’s reference junction can impact the electrode’s ability to perform its task.Remember electrodes need to be rinsed and blotted before each test.

Maintenance is critical. Periodic and proper cleaning is required. Protein and other contaminants can build up on the electrode reference junction or sensing areas, often resulting in a longer time to endpoint. Cleaning solutions specifically designed for differing electrode styles are required.

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Tech Tip: Conditioning New pH Electrodes

3580100Many pH electrodes are shipped with the electrodes moist. Prior to using your electrode for the first time it needs to be conditioned. While it is always best to refer to the manufacturer instructions for proper electrode conditioning, below are three common recommended steps for conditioning your electrode:

1. Remove the protective cap or bottle from the bottom of the sensor and rinse the electrode with distilled or deionized water and blot with a Kimwipe.

2. Place the electrode in a beaker containing one of the liquids listed below (in order of ionic ability to condition the electrode.) Soak for 20 minutes.
• 3.0 M KCI
• 4.0 pH buffer
• 7.0 pH buffer

Note: Never condition or store a pH electrode in water – long term exposure to purified water will damage the special glass membrane.

3.  After conditioning the sensor for 20 minutes, rinse the electrode with distilled or deionized water and blot with a Kimwipe. The electrode is now ready for calibration and to measure pH.

For more information, see our selection of electrodes on our website or contact our Customer Service Department at 800-826-8302.

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