Introduction

While pH meters are common in wastewater treatment, chemical dosing, and process control, the real workhorse is the pH electrode. This sensitive component determines measurement accuracy and reliability.

Why do some electrodes last 2 years while others fail in 5 months? The difference often comes down to basic maintenance. A single glance reveals the contrast: a clean, crystal-clear glass bulb versus a crusted, corroded sensor tip. Same model, dramatically different outcomes.

1. Regular Cleaning

Process fluid buildup degrades accuracy and shortens lifespan. Clean your electrode 1-3 times monthly based on usage:

• Rinse with deionized water after each use
• For refillable models: check and refill electrolyte solution
• For sealed types: keep the membrane clean and moist

2. Proper Storage

Electrodes require hydration to function properly:

• Use a storage cap or bottle with soaking solution
• Avoid deionized water – it damages the reference system

DIY Storage Solution Recipe:

• Dissolve 1 sachet pH 4.00 buffer in 250 mL pure water
• Add 56 g analytical-grade KCl
• Heat and stir until fully dissolved

3. Post-Use Maintenance

For intermittent usage, follow these steps:

• Always rinse with deionized water
• Never wipe the glass bulb – gently shake instead
• Rehydrate before reuse

4. Targeted Cleaning Methods

• Salt buildup: Stir in tap water 10-15 minutes, then rinse with distilled water
• Oil/grease: Use neutral detergent or ethanol/acetone for 5-10 seconds
• Clogged reference: Soak tip in warm (60-80°C) KCl for 10 minutes, then cool