Wireless water quality (pH) sensor

Typical Applications

This pH sensor can replace traditional pH meters in all experimental or demonstration scenarios. It further enables automated data collection, software-based graphing, and data analysis. Typical applications include:

• Investigating common household acids and bases.
• Acid-base titration.
• Studying the effects of buffer solutions.

Note

This product is intended solely for educational purposes and is not suitable for industrial, medical, research, or commercial applications.

Usage Guidelines

1. Before measurement, the electrode must be calibrated for slope using a standard buffer solution of known pH. The pH of the calibration buffer should closely match that of the sample.
2. Prior to use, unplug the filling hole on the electrode's side tube to maintain pressure equilibrium.
3. During use, avoid contact between the glass bulb (inside the plastic guard) and hard objects. Any damage or abrasion may impair measurement accuracy or destroy the electrode. Begin by unscrewing the cap and removing the sensor probe from its storage bottle. Rinse the probe tip, especially the bulb, thoroughly with distilled water.
4. When inserting the probe into the sample solution, ensure it is fully submerged.
5. After use, rinse the probe tip with distilled water, then cover it with the comfort cap containing a small amount of 3 mol/L KCl solution to keep the bulb moist. If the storage solution is depleted before use, soak the electrode in 3 mol/L KCl for several hours to restore optimal performance.
6. The external reference filling solution for this electrode is 3 mol/L KCl (a small bottle of KCl solution is included). Refill the solution via the electrode's upper port.
7. Keep the electrode's output terminal (connector) clean and dry. Avoid short-circuiting, as this may impair accuracy or damage the electrode.
8. Avoid prolonged immersion in distilled water, protein solutions, acidic fluoride solutions, or contact with silicone grease.
9. If the electrode's slope declines after extended use, soak the bulb in 4 % HF (hydrofluoric acid) for 3–5 seconds, rinse with distilled water, then soak in 0.1 mol/L HCl for several hours before rinsing again. (Caution: HF is harmful to people; perform this step in a well-ventilated area.)
10. Solutions containing contaminants that may foul the bulb or clog the junction can passivate the electrode, manifesting as reduced slope, prolonged response time, or unstable readings. Clean with a suitable solution tailored to the specific contaminant. (Caution: Avoid cleaners like carbon tetrachloride, trichloroethylene, tetrahydrofuran, or acetone, which may dissolve polycarbonate resin and damage the electrode.)
11. The pH sensor probe is glass and fragile — handle with care during use and storage.
12. Do not expose the probe to hydrofluoric acid or acid/alkali solutions exceeding 1.0 M concentration. While the sensor can measure pH in near 1.0 M NaOH, do not immerse the probe for more than 5 minutes.
13. Lifespan: 1 year. Higher usage frequency shortens the probe's lifespan. (Damage caused by the user — such as bulb breakage, connector contamination, or misuse — is not covered by warranty.)