Applications of Dwyer CDT-2D40 CO₂ Duct Sensor in HVAC Systems

Discover applications of the Dwyer CDT-2D40 CO₂ duct sensor in HVAC systems. Genuine device, accurate CO₂ measurement, optimized ventilation, and energy savings.

Applications of the Dwyer CDT-2D40 CO₂ Duct Sensor in HVAC Systems

In commercial buildings, offices, shopping centers, and schools, indoor air quality (IAQ) monitoring is critical for occupant health, energy efficiency, and HVAC system performance. The Dwyer CDT-2D40 CO₂ duct sensor accurately measures CO₂ levels in the air, providing reliable data for AHU, VAV, or BMS control systems to optimize ventilation and reduce energy consumption.

This sensor is imported and officially distributed by DLK – DLK Trading Service Company Limited, ensuring genuine products, technical support, and compliance with project requirements.

HVAC Industry Requirements for CO₂ Measurement

Modern ventilation systems require precise CO₂ monitoring not only to maintain air quality but also to reduce operational costs. When CO₂ concentration rises above recommended levels, AHU or VAV systems automatically increase fresh air supply. Conversely, low CO₂ levels allow reduced airflow, saving energy for fans and chillers.

Key technical requirements include:

• High accuracy ±50 ppm for precise control

• Measurement range 0–2000 ppm (depending on the model)

• Easy BMS integration via 4–20 mA or Modbus output

• Duct-mount design for direct airflow measurement

How the Dwyer CDT-2D40 Works in HVAC Systems

The Dwyer CDT-2D40 uses NDIR (Non-Dispersive Infrared) technology to detect CO₂ concentration in air without interference from other gases. The sensor converts CO₂ levels into a 4–20 mA signal, which is sent to the BMS or PLC, allowing automated control of dampers and fan speed.

Its duct-mount design ensures direct measurement of the airflow within the duct, minimizing error and providing reliable readings over long-term operation. The polycarbonate enclosure with IP65 rating ensures stable operation in mechanical rooms and humid duct environments.

Technical Benefits of the Dwyer CDT-2D40

• Accurate CO₂ measurement for automated ventilation and energy optimization

• Maintains IAQ according to ASHRAE 62.1 or EN 13779 standards

• Compatible with BMS via 4–20 mA output

• Duct-mount design allows easy installation and low maintenance

• Long sensor lifetime reduces replacement and operating costs

Practical Applications of the Dwyer CDT-2D40

Offices and Commercial Buildings

In office environments, CO₂ levels rise quickly in enclosed spaces with many occupants. The Dwyer CDT-2D40 continuously monitors CO₂ in supply and return ducts, allowing the BMS to automatically increase fresh air and maintain a healthy indoor environment.

Schools and Classrooms

CO₂ monitoring ensures students and teachers remain in safe air quality conditions while reducing energy consumption during low occupancy periods.

Shopping Centers and Entertainment Spaces

For high-traffic areas, adjusting ventilation based on CO₂ levels saves energy, reduces load on chillers and fans, and improves customer comfort.

Cleanrooms and Healthcare Facilities

Critical spaces such as clinics, laboratories, and operating rooms require strict IAQ standards. The Dwyer CDT-2D40 provides precise CO₂ readings that integrate with BMS to maintain proper airflow and pressure balance.

Case Study: Optimizing Office Ventilation with Dwyer CDT-2D40

A 15-story office building in Hanoi installed Dwyer CDT-2D40 sensors on supply and return ducts. When occupancy increased, the sensors detected higher CO₂ levels, prompting the BMS to increase fresh air supply. When rooms were less occupied, airflow decreased, saving fan and chiller energy. Result: an 18% reduction in HVAC energy costs compared to fixed ventilation control.

Purchasing and Technical Support from DLK

DLK – DLK Trading Service Company Limited is the official distributor of Dwyer, Omega, Honeywell products in Vietnam. Purchasing the Dwyer CDT-2D40 CO₂ duct sensor from DLK guarantees genuine devices, full datasheets, and CO/CQ for project compliance.

DLK’s engineering team provides expert guidance on sensor placement, BMS integration, and ventilation optimization tailored to specific building types, ensuring maximum efficiency and reliability.