pH-5018 Glass pH Electrode

Product Details: pH-5018 Glass pH Electrode

Measurement Principle

The pH-5018 glass pH electrode operates on the principle of electrochemistry, specifically leveraging the galvanic cell concept.  A galvanic cell is a system designed to convert chemical energy into electrical energy.  The voltage generated by this cell is termed as the Electromotive Force (EMF).  This EMF comprises two half-cells: one is known as the measuring half-cell, whose potential is related to the specific ion activity, and the other is the reference half-cell, commonly referred to as the reference electrode.  The reference electrode communicates with the measured solution and is connected to the measuring instrument.  The potential difference produced by the internal galvanic cell reaction is transmitted to the pH controller, which then uses a corresponding algorithm to convert and display the pH value.

pH-5018 Glass pH Electrode Specifications：

Electrode Slope：

The theoretical slope of a glass electrode at 25°C is 59.16 mV, meaning that for every change of one pH unit in the solution, the glass electrode produces a potential change of 59.16 mV.  However, in practice, no glass electrode can reach 100% of this theoretical value.  Typically, the electrode slope is above 95% of the theoretical value (percentage slope).  Additionally, the mV difference per pH unit varies with temperature.

Temperature Correction Formula:

ΔE = 59.16 * [(273 + T) / 298] * ΔpH

pH-5018 Glass pH Electrode Usage Precautions：

Electrode Lead: The electrode lead is a special shielded cable.  Customers are prohibited from cutting or splicing the lead without authorization.  We will not be responsible for any consequences arising from such actions.

Immersion Environment: Avoid long-term immersion in distilled water or protein solutions, and prevent contact with silicone grease.

Maintenance: For electrodes that have been in use for an extended period, the glass membrane may become transparent or covered with deposits.  In such cases, clean the electrode with dilute hydrochloric acid and rinse with water.

Replacement: If the electrode cannot be calibrated or perform normal measurements even after maintenance and servicing, it indicates that the electrode cannot recover its responsiveness.  Please replace the electrode.

Water Resistance: The pH electrode cable is not waterproof.  Avoid contact between the electrode cable and water.

Contact Us

For more information about the pH-5018 glass pH electrode or to place an order, please do not hesitate to contact us.  We are committed to providing you with the best products and services.

Correspondence between pH and mV

Correspondence between pH and mV at 25°C

pH/ORP Electrode Ensemble Operating Instructions

pH-ORP-Electrode-Ensemble-Operating-Instructions.pdf