The NO3- Nitrate Ion Selective Electrode is a PVC membrane-based sensor designed for precise measurement of nitrate ion concentrations in aqueous solutions. Utilizing advanced ion-selective membrane technology, this electrode provides accurate, reagent-free analysis with fast response times and stable signal output.

• Reagent-free operation eliminates chemical waste and reduces costs
• Pollution-free design supports environmental compliance
• Fast response time with stable signal output via redox potential measurement
• Durable PP housing material ensures long service life
• High-quality sensor-specific cables enhance measurement accuracy

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

Preserve electrode in deionized water or low-concentration standard solution (1 ppm). No reactivation required before reuse.

Rinse with deionized water, wipe membrane with non-woven cloth, dry thoroughly, and store in original packaging. Reactivate in 1 mg/L standard solution for over 2 hours before reuse.

If slope deviation occurs, prepare fresh diluted standard solution and soak electrode for 10 minutes before retesting. Contact technical support if issues persist.