How to Clean Your Digital Residual Chlorine Sensor？

Proper cleaning of digital residual chlorine sensors is essential for reliable water quality measurements. Fouling from organic matter, biofilm, or mineral deposits can impair sensitivity and accuracy. Follow these key steps:

1. Physical Cleaning (Gentle Removal)

Rinse: Flush the sensor with clean, deionized water after each use to remove loose debris.

Wipe: Gently scrub the sensing surface (e.g., membrane or optical window) with a soft cloth or soft-bristle brush. Avoid abrasive materials!

Check: Inspect for scratches or damage. Replace protective caps/covers if compromised.

2. Chemical Cleaning (For Stubborn Deposits)

Mild Acid Solution (e.g., 10% HCl):

Immerse the sensing tip for 5–15 minutes to dissolve mineral scales (e.g., calcium carbonate).

Rinse thoroughly with deionized water afterward.

Dilute Bleach (e.g., 1% NaOCl):

Use to remove organic/biofilm buildup (soak 10–20 minutes).

Always rinse extensively to prevent bleach residue from affecting readings.

Enzyme Cleaners: Safe for biofilms; follow manufacturer guidelines.

Never use solvents, oils, or abrasive cleaners.

3. Rinsing & Drying

Rinse sensor 3–5 times with deionized water after chemical cleaning.

Air-dry vertically in a clean, dust-free environment. Do not wipe sensing surfaces dry.

4. Calibration & Validation

Recalibrate the sensor after cleaning using standard solutions.

Verify accuracy against a reference method if possible.

Key Considerations:

Frequency: Clean weekly in heavy-fouling environments; monthly in cleaner systems.

Optical Sensors: Use lens-specific wipes; avoid touching optical surfaces.

Membrane Sensors: Replace membranes/electrolyte per the manufacturer’s schedule.

Consult Manual: Always follow your sensor model’s specific cleaning protocols.

Pro Tip: Log cleaning dates and observe performance trends. Sudden drift often signals needed maintenance!

Regular cleaning preserves sensor lifespan and ensures compliance with water safety standards. When in doubt, prioritize gentle methods to avoid irreversible damage.