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Residual Chlorine / Chlorine Dioxide Sensor for Online Water Disinfection Monitoring
Instrava residual chlorine and chlorine dioxide sensor is designed for accurate and stable online measurement in drinking water and industrial water treatment applications. Based on Swiss membrane-covered amperometric technology, the sensor provides fast response, high precision, and long-term stable operation without the use of reagents.
Key Benefits
Swiss membrane-covered amperometric sensor technology
Measures residual chlorine (HOCl) and chlorine dioxide (ClO₂)
Reagent-free operation with low maintenance requirements
Stable measurement independent of flow and pressure changes
Suitable for standard, customized, and OEM integration
Transmitters & Sensors Description
Why Choose This Sensor for Disinfection Monitoring
In water disinfection processes, inaccurate residual chlorine or chlorine dioxide measurement can lead to insufficient sterilization or excessive chemical dosing. This sensor is designed to address these challenges by providing stable, precise, and reliable measurements under real operating conditions.
For water utilities, system integrators, and OEM manufacturers, the sensor offers:
High measurement accuracy even at low concentration levels
Fast response time for real-time process control
Reduced operational costs due to low maintenance and reagent-free design
Long-term continuous operation with minimal intervention
Residual Chlorine/chlorine Dioxide Sensor Measurement Technology & Performance
The sensor adopts a Swiss membrane-covered amperometric measurement principle with a three-electrode system, ensuring high selectivity and stable signal output. Integrated Pt1000 temperature sensing enables automatic temperature compensation, while pH compensation further improves measurement accuracy in varying water conditions.
A dedicated flow cell design ensures that measurement results are not affected by changes in flow velocity or pressure, making the sensor suitable for continuous online monitoring.
Technical Advantages
Three-electrode amperometric measurement system
Automatic temperature compensation via Pt1000 sensor
pH-compensated measurement for improved accuracy
Fast response time of less than 30 seconds after polarization
Designed for long-term continuous operation
Residual Chlorine/chlorine Dioxide Sensor Typical Applications & Use Scenarios
This residual chlorine / chlorine dioxide sensor is widely applied in disinfection monitoring across multiple water-related sectors:
Drinking Water Treatment Plants
Continuous monitoring of disinfectant residuals to ensure water safety and regulatory compliance.Distribution Networks
Online measurement of residual disinfectants in pipelines and storage facilities.Industrial Process Water
Monitoring chlorine-based disinfection in cooling water and process water systems.OEM Water Quality Analyzers
Integration into multi-parameter analyzers, monitoring skids, and automated disinfection control systems.
Residual Chlorine/chlorine Dioxide Sensor Operation & Maintenance Benefits
The sensor operates without chemical reagents and is designed for long service life. Under normal operating conditions, it can run continuously for at least nine months without maintenance, significantly reducing service frequency and operational workload.
Its low power consumption and robust construction make it suitable for remote and unattended monitoring installations.
Transmitters & Sensors Parameter
Measured Parameters
Residual chlorine (HOCl)
Chlorine dioxide (ClO₂)
Measurement Range
0–5 mg/L
0–20 mg/L
Accuracy
±2%
±0.03 ppm at pH 7 (drinking water)
Response Time
<30 s after polarization
pH Range
5–9 pH
Conductivity Requirement
≥100 μS/cm
Sample Flow Velocity
≥0.03 m/s (in flow cell)
Maximum Pressure
1.0 MPa
Dimensions
Ø21.5 × 133 mm
Process Connection
3/4 NPT
Cable Length
3 m
Ingress Protection
IP65
Instrava OEM/ODM
Reliable Instruments. Solutions That Fit Your Application.
Instrava is focused on delivering reliable industrial solutions through carefully curated products, application-driven optimization, and flexible customization. We select proven instruments from trusted manufacturers to ensure consistent quality, optimize solutions based on real working conditions to solve practical challenges, and provide tailored configurations to meet specific application needs.
By combining selection expertise with application understanding, Instrava helps customers reduce risk, improve efficiency, and achieve dependable results in complex industrial environments.
What disinfectants can this sensor measure?
This sensor is designed to measure residual chlorine (HOCl) and chlorine dioxide (ClO₂), making it suitable for common disinfection processes in drinking water and industrial water treatment systems.
How does the sensor maintain accuracy under changing water conditions?
The sensor uses a membrane-covered amperometric principle with a three-electrode system, combined with automatic temperature compensation and pH compensation to ensure stable and accurate measurements under varying conditions.
Is the measurement affected by flow rate or pressure changes?
No. The sensor is used with a dedicated flow cell, which isolates the measurement from variations in flow velocity and pressure, ensuring consistent and reliable readings during continuous operation.
Does the sensor require chemical reagents or frequent maintenance?
The sensor operates without chemical reagents and is designed for long-term use. Under normal conditions, it can operate continuously for at least nine months without maintenance, reducing operating costs.
How fast does the sensor respond to concentration changes?
After polarization is completed, the sensor responds to changes in disinfectant concentration in less than 30 seconds, making it suitable for real-time monitoring and control applications.
Can this sensor be integrated into OEM or automated monitoring systems?
Yes. Instrava provides OEM and customization support, allowing the sensor to be integrated into analyzers, control panels, and automated water monitoring systems with engineering assistance throughout the project.
Why Choose Instrava
Built on Consistency, Not Claims
Focused on Industrial Applications
We specialize in industrial analysis and detection, with a clear understanding of real-world operating environments and requirements.
Strict Product Selection Criteria
Every instrument is evaluated based on performance, stability, and application suitability—not just specifications or pricing.
Reliable Supply & Quality Consistency
We work with trusted manufacturers to ensure stable supply, consistent quality, and dependable delivery.
Practical, Experience-Based Support
Our recommendations are grounded in application understanding, helping customers avoid common issues and achieve reliable results.
Instrava is built to reduce uncertainty—so every decision you make is clearer, safer, and more reliable.
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