Residual chlorine sensors are essential instruments for continuously monitoring free residual chlorine in drinking water, wastewater, industrial process water and commercial water treatment systems. Designed for accurate, real-time measurement, they help optimise chlorine dosing, improve process control, support regulatory compliance and maintain consistent water quality. With fast response, reliable performance and low-maintenance operation, APS Technology's residual chlorine sensors provide dependable long-term monitoring across a wide range of industrial and municipal applications.
WHAT IS A RESIDUAL CHLORINE SENSOR?
A residual chlorine sensor continuously measures the concentration of free residual chlorine remaining in treated water after the disinfection process. Unlike manual testing, online sensors provide real-time measurement, enabling operators to respond immediately to changing process conditions and optimise chlorine dosing.
Residual chlorine monitoring plays a critical role in ensuring water remains safe for consumption and industrial use while preventing under-dosing, over-dosing and unnecessary chemical consumption.
APS Technology offers sensors suitable for a wide variety of applications and installation methods.
GCLS-1000 Online Residual Chlorine Sensor
Designed for continuous online monitoring using membrane sensor technology.
Ideal for:
Drinking water
Industrial process water
Wastewater treatment
Municipal water systems
Swimming pools
Reverse osmosis
Aquaculture
Environmental monitoring
Key advantages include:
Continuous online monitoring
Fast response (<90 seconds)
High measurement accuracy
Replaceable membrane
Replaceable electrolyte
IP68 protection
Long service life
ADVANTAGES
1. Continuous Online Monitoring
Provides real-time measurement of free residual chlorine for continuous process control without the need for frequent manual sampling.
2. High Measurement Accuracy
Measurement range: 0–20 mg/L
Accuracy: ±2% or ±10 ppb
Reliable and consistent chlorine measurement for industrial and municipal water applications.
3. Fast Response Time
Response time of less than 90 seconds
Quickly detects changes in chlorine concentration
Supports rapid process adjustments and improved dosing control.
4. Low-Maintenance Design
Replaceable membrane and electrolyte
Simple routine servicing
Stable long-term performance with minimal maintenance requirements.
5. Industrial-Grade Construction
IP68 protection rating
Designed for continuous operation in harsh industrial environments
Durable construction for reliable long-term performance.
6. Easy System Integration
Compatible with APS GCLC-1000 Advanced Chlorine Controller
Compatible with APS GCLC-1001 Standard Chlorine Controller
Easily integrates into complete online chlorine monitoring systems.
7. Flexible Installation
Immersion mounting
G3/4 process connection
5 m cable supplied (custom lengths available).
8. Reliable 24/7 Monitoring
Designed for continuous online operation to support consistent water quality monitoring across municipal, commercial and industrial applications.
Conclusion
Continuous residual chlorine monitoring is essential for maintaining safe, efficient and compliant water treatment operations. APS Technology's GCLS Series provides reliable online chlorine measurement with high accuracy, rapid response and robust industrial construction, helping operators optimise chlorine dosing, improve process control and maintain consistent water quality across a wide range of applications.
GET IN TOUCH TO DISCUSS YOUR WATER MONITORING REQUIREMENTS
Whether you're upgrading an existing treatment system or implementing a new monitoring solution, APS Technology Australia can help you select the right residual chlorine sensor for your application.