Residual Chlorine Sensor – C20
Digital residual chlorine sensor for water and wastewater disinfection monitoring.
Model C20 provides accurate and stable chlorine concentration measurement with RS485 Modbus RTU output. Designed for drinking water treatment, wastewater facilities and industrial process systems where reliable chlorine monitoring is required.
Typical applications
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Drinking water disinfection monitoring
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Wastewater treatment plants
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Industrial cooling towers
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Food & beverage processing water
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Pharmaceutical water systems
Description
Residual Chlorine Sensor for Water & Wastewater Treatment
The C20 Residual Chlorine Sensor is a digital sensor designed for continuous monitoring of residual chlorine concentration in water treatment and wastewater processes. It is widely used in drinking water treatment plants, wastewater treatment facilities, cooling water systems, and industrial process applications, where accurate chlorine control is critical for disinfection and process safety.
The sensor features a simple and robust construction, allowing easy cleaning and replacement, which reduces maintenance effort and downtime. Its chemically resistant polymer housing ensures long-term durability when exposed to aggressive water conditions.
With RS485 Modbus RTU communication, the C20 sensor integrates easily into PLC, SCADA, and automation systems. In water and wastewater installations, chlorine measurement is often combined with VFD-controlled pumps, dosing systems, and blowers to achieve stable disinfection performance and optimized chemical consumption.
Thanks to its high stability, strong anti-interference capability, and IP68 protection, the C20 is suitable for permanent installation in demanding industrial environments.
System integration note:
The C20 residual chlorine sensor is suitable for closed-loop control systems and can be integrated with controllers and VFD-driven dosing or pumping systems for precise and energy-efficient operation.
Features
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Continuous monitoring of residual chlorine concentration
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Measuring range up to 20 mg/L
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Digital RS485 Modbus RTU output for reliable communication
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Chemically resistant polymer sensor body
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Stable zero point for accurate and repeatable measurements
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Strong anti-interference performance
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Simple structure for easy cleaning and maintenance
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IP68 protection, suitable for submerged installation
Specification
| Parameter | Specification |
|---|---|
| Measuring range | 0–20 mg/L |
| Measurement accuracy | ±1% F.S |
| Output signal | RS485 (Modbus RTU) |
| Power supply | 9–36 V DC |
| Operating temperature | 0–50 °C |
| Operating pressure | 0–0.3 MPa |
| Protection rating | IP68 |
| Sensor material | Chemically resistant polymer |
| Installation | Immersion / inline (application dependent) |
FAQ
What is residual chlorine and why is it important to measure it?
Residual chlorine is the amount of chlorine remaining in water after disinfection. It ensures that water remains safe from microbial contamination throughout the distribution or process system. Accurate residual chlorine measurement is essential in drinking water treatment, wastewater treatment, and industrial processes to maintain effective disinfection while avoiding excessive chemical dosing.
Where is the C20 residual chlorine sensor typically used?
The C20 sensor is designed for industrial and municipal water applications, including:
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Drinking water treatment plants
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Wastewater treatment facilities
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Industrial cooling water systems
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Food & beverage process water
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Pharmaceutical water systems
It is not intended for consumer or pool applications.
How does the C20 sensor integrate into automation systems?
The C20 uses RS485 Modbus RTU communication, making it easy to integrate with:
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PLC systems
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SCADA platforms
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Process controllers
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Automation panels
In many installations, the sensor signal is used together with VFD-controlled pumps or dosing systems to regulate chlorine injection based on real-time measurements.
Is the sensor suitable for harsh or submerged environments?
Yes. The C20 residual chlorine sensor has an IP68 protection rating, allowing reliable operation in wet or submerged environments. The chemically resistant polymer housing provides durability in aggressive water conditions commonly found in water and wastewater treatment plants.
How accurate and stable is the measurement over time?
The sensor offers ±1% full-scale accuracy and is designed with a stable zero point to ensure reliable and repeatable measurements. Its digital signal transmission provides strong resistance to electrical interference, even in industrial environments with pumps, motors, and VFDs.
What maintenance does the residual chlorine sensor require?
The C20 features a simple mechanical structure, allowing easy cleaning and replacement when required. Regular maintenance depends on water quality and application conditions, but the design minimizes downtime and simplifies routine servicing.
Can the sensor be used in closed-loop control systems?
Yes. The C20 is suitable for closed-loop control applications, where chlorine concentration data is used to control dosing pumps or treatment processes. It is commonly applied in systems where automation controllers and VFD-driven equipment work together to optimize disinfection efficiency and chemical consumption.
Is technical support available for system integration?
Yes. As part of an industrial automation solution, support is available for:
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Sensor selection
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Signal integration (RS485 Modbus)
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Application suitability in water & wastewater systems
This ensures the sensor is correctly applied within professional automation and VFD-based control systems.
