Table of Contents
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What is ASR®?
Overview
This article explains the technical function of ASR® (Automatic Sensor Cleaning) and summarizes how the electrochemical cleaning cycle reduces sensor fouling in continuous operation.
ASR® is designed to decrease manual cleaning effort and support stable measurement performance between maintenance intervals.
Operating Principle
During an ASR® cleaning cycle, water is electrolyzed at the sensor surface:
H2O → O2 + H2
The generated gases act directly at the interface where deposits form and create a multi-layer cleaning effect.
Cleaning Mechanism
- Hydrogen/oxygen bubble formation creates local shear forces that help detach adhered coatings.
- Oxygen supports oxidation of organic contamination layers.
- Hydrogen supports reduction of oxide-based deposits (for example iron and manganese compounds).
- The combined action helps weaken and remove mixed fouling layers, including biofilm-like structures.
Process Characteristics
- Generated gas volumes are small and remain within normal process operation limits.
- After the cleaning pulse, gases recombine quickly to water.
- No external mechanical cleaning step is required during the ASR® cycle.
- Effectiveness depends on water composition, fouling type, and configured cleaning frequency.
Operational Notes
- Set cleaning intervals according to observed fouling tendency and process stability.
- After parameter changes, verify trend stability and sensor response under normal flow conditions.
- If drift persists, check sample quality, flow conditions, and sensor condition before increasing cleaning frequency further.
Video Reference
Technical overview: ASR® technology video