Rotronic
CL11 – CO₂, Humidity and Temperature Transmitter for Indoor Climate Monitoring
When indoor air quality affects comfort, performance, and energy efficiency, you need reliable measurement you can integrate directly into your systems.
The Rotronic CL11 is a compact indoor climate transmitter that measures CO₂, humidity, and temperature in one device – giving you a solid foundation for ventilation control and environmental monitoring.
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When Indoor Climate Needs to Be Controlled – Not Assumed
CO₂ levels are a key indicator of indoor air quality. Without reliable measurement, ventilation systems often run inefficiently – either over-ventilating or not reacting in time.
In practice, this can lead to:
- Reduced comfort and concentration
- Unnecessary energy consumption
- Lack of documentation for indoor conditions
The CL11 gives you continuous, reliable data that you can use for control, monitoring, and optimization.
Accurate CO₂ Measurement with Proven NDIR Technology
The CL11 uses NDIR (Non-Dispersive Infrared) technology for CO₂ measurement – a proven method known for stability and long-term reliability.
- Stable CO₂ measurement with low drift
- Designed for continuous indoor monitoring
- Minimal maintenance requirements
This ensures that your measurements remain consistent over time, even in demanding environments.
One Device – Multiple Parameters
In addition to CO₂, the CL11 measures:
- Relative humidity
- Temperature
This allows you to monitor the full indoor climate with a single device, simplifying installation and integration.
Designed for Integration into Building and Control Systems
The CL11 is built for easy integration into your existing infrastructure.
- Analog and digital outputs
- Compatible with HVAC and building management systems (BMS)
- Suitable for both standalone monitoring and system integration
This makes it easy to use CL11 as part of a demand-controlled ventilation strategy.
Compact Design for Flexible Installation
The CL11 is designed for indoor environments where space and appearance matter.
- Wall-mounted design
- Suitable for offices, classrooms, and public spaces
- Discreet and functional installation
Works with CO₂ Display for Visual Monitoring
For applications where visibility is important, the CL11 can be combined with the Rotronic CO₂ Panel.
- CL11 → measures and transmits data
- CO₂ Panel → displays values clearly in real time
This combination allows you to:
- Integrate with control systems
- Provide visual feedback to users and operators
Applications
The CL11 is suitable for a wide range of indoor environments:
- Offices and commercial buildings
- Schools and educational facilities
- Hospitals and healthcare environments
- Laboratories and controlled rooms
- Production and processing areas
What This Means for Your Work
With the CL11, you get:
- Reliable indoor air quality data
- Better control of ventilation systems
- Reduced energy consumption through demand-based control
- Simple installation and integration
- A flexible solution for both monitoring and control
These products are used within these applications
Research & Lab
Ensure reliable, reproducible, and compliant laboratory measurements with integrated solutions for sampling, analysis, and continuous monitoring.
Pharmaceuticals
Reliable monitoring solutions for life science environments – including purified water analysis, gas monitoring and medical gas verification.
Air Monitoring
Ensure clean air, regulatory compliance, and safe working environments with accurate and continuous air quality measurement.