Electrochemical chlorine dioxide sensor AS2

for water treatmentmonitoringfor process measurement

Overview
The German-made amperometric chlorine dioxide sensor AS2 is designed for continuous ClO2 measurement in municipal drinking water and standard process water. Intended for standard environments up to 50 °C, the potentiostatic three-electrode system delivers precise measurements and long-term signal stability. The sensor includes automatic temperature compensation, multiple electronic interface options and indefinite dry storage (no electrolyte), facilitating installation and stock management.

Special features

• Non-membrane design suitable for a wide concentration range
• Compatible with high operating pressures (up to 8 bar with correct mounting)
• Short response time: T90 ≈ 30 s
• Tolerant to surfactants and common process contaminants
• Optional RV1 automatic electrode cleaning to reduce maintenance

Applications

• Municipal drinking water monitoring and control
• Process water and standard water treatment applications

Process conditions

• Recommended: stable pH
• Measuring water temperature: 0…+50 °C (no ice crystals)
• Ambient temperature: 0…+55 °C
• Maximum allowed pressure (with appropriate mounting/conditions): up to 8 bar

Technical specification
Measurement parameter: Chlorine dioxide (ClO2)
Measuring ranges / resolution: multiple ranges from 0.003…200.0 ppm; resolutions down to 0.001 ppm
Response time: Sensor T90 ≈ 30 s; temperature compensation response t90 ≈ 10 min
Flow requirements: without RV1 min. 15 l/h; with RV1 45–90 l/h
pH range: pH 1–12 (decomposition of ClO2 starts at/above pH 12)
Protection class: IP68 (M12 plug, 5‑pole); IP65 (2‑pole terminal with mA‑hood)
Material: PVC‑U

Model details

• Model: AS2 — potentiostatic three-electrode amperometric sensor
• Measurement target: Chlorine dioxide (ClO2)
• Multiple measuring ranges with resolutions to 0.001 ppm
• Automatic temperature compensation via integrated sensor
• Indefinite dry storage (no electrolyte) for simplified logistics
• Optional RV1 automatic electrode cleaning
• Electrical options: 5‑pole M12 plug or 2‑pole terminal with mA‑hood