Temperature Transmitters in Industrial Process Control
From Local Measurement to Predictive Process StabilityTemperature is one of the most fundamental variables in industrial processes.Yet in modern automated...
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Transmitter
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
Instrava Engineering & Customization Support
At Instrava, our instruments are developed with a strong focus on real industrial applications. Each product is designed to operate as a reliable component within measurement, control, and automation systems, rather than as a standalone device.
Our engineering team supports customers during product selection by evaluating process conditions, operating environments, and system requirements, ensuring stable and long-term performance in actual use.
In addition to standard configurations, Instrava offers flexible customization options, including measurement range, materials, output signals, communication interfaces, and installation methods. All custom solutions are engineered to meet industrial standards and application-specific demands.
We also support OEM projects and system integration, providing consistent product design, technical documentation, and long-term supply to ensure smooth integration and reliable operation throughout the project lifecycle.
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.
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.
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.
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.
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.
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
By choosing Instrava, you gain a partner with a deep understanding of industrial applications and the expertise to meet today’s operational challenges.
Our role extends beyond products—we support your success through dependable solutions and long-term commitment.
Engineering-Driven Innovation
Innovation at Instrava is guided by real industrial requirements. We continuously refine our technologies to address evolving operational challenges, ensuring practical and reliable performance in demanding environments.
Application-Specific Customization
We provide engineering-level customization to match specific process conditions. From measurement range and materials to output signals and installation options, our solutions are configured to fit real applications.
Proven Quality and Reliability
Quality and reliability are fundamental to every Instrava product. Manufactured under strict quality control and thoroughly tested, our instruments deliver accurate, stable, and long-term performance.
Global Capability with Local Support
Instrava combines global engineering expertise with responsive local support, ensuring our partners benefit from internationally aligned technology and timely regional service.
Comprehensive Product Portfolio
Our broad portfolio of measurement and control instruments enables us to address a wide range of industrial needs, providing integrated solutions from a single, reliable source.
Partner-Oriented Engineering Support
We work closely with our partners from technical consultation to after-sales support. Our focus is on delivering solutions that create lasting value and support long-term operational success.
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