The ion-selective electrode (ISE) is a precision membrane electrode that generates membrane potential through ion exchange or diffusion processes. Featuring an ion-selective membrane, internal reference electrode (Ag/AgCl), and internal reference solution, this sensor measures the electrical potential of fluoride ions in solution relative to a reference electrode. The potential difference correlates with ion activity, enabling accurate quantitative analysis of fluoride concentration.

• Reagent-free operation eliminates pollution and reduces operational costs
• Redox potential measurement ensures rapid response and signal stability
• Durable polypropylene construction for long service life
• High-quality sensor cables enhance measurement accuracy and reliability

1. Remove protective cap from electrode tip (avoid touching sensitive area)
2. Shake electrode downward to eliminate internal air bubbles
3. Activate new or long-unused electrodes by soaking in 1 ppm standard solution for 24 hours
4. Rinse with deionized water, blot dry, and immerse in deionized water for 5 minutes with stirring before testing

1. Connect electrode to meter and set to mV mode
2. Prepare 100 mL deionized water in 150 mL beaker with stirring
3. Add 1 mL of 1000 ppm standard solution, record stable reading (E₁)
4. Add 10 mL of same standard solution, record stable reading (E₂)
5. Calculate slope at 25°C as E₂ - E₁ and compare with specifications

Short-term: Preserve in deionized water or low-concentration standard solution (1 ppm)

Long-term: Rinse, dry thoroughly, and store in original packaging. Reactivate in 1 mg/L standard solution for over 2 hours before reuse.