COMET T6445 – CO₂, Temperature, and Humidity Duct Transmitter

COMET T6445 CO₂ + T + RH Duct Transmitter RS485 

The COMET T6445 is a high-precision duct CO₂ transmitter with integrated temperature and humidity measurement – specially designed for direct installation in supply and exhaust air ducts of ventilation and air-conditioning systems. Equipped with a proven, maintenance-free dual-wavelength NDIR CO₂ sensor (0–5000 ppm, optional up to 10,000 ppm) and a 3-color LED indicator (green/yellow/red), it instantly shows the air quality status – ideal for energy-efficient, demand-controlled ventilation in schools, offices, halls, and high-occupancy environments.

The 150 mm stainless-steel probe extends deep into the airflow, ensuring representative measurement values even at high air velocities. The sensor is designed for continuous operation in harsh HVAC environments: automatic long-term calibration, aging compensation, and high resistance to contamination guarantee years of reliable, maintenance-free operation.

In addition to CO₂, the T6445 simultaneously measures temperature (–30 to +60 °C) and relative humidity (0–100 %RH) and calculates dew point, absolute humidity, and more. All measured and calculated values are available via the galvanically isolated RS485 interface with the Modbus RTU protocol – ready for seamless integration into any building automation, BMS, or SCADA system.

The robust IP65 housing, simple duct installation, and a 3-year warranty make the T6445 the new standard for professional CO₂ duct measurement.

Why COMET T6445 is the best CO₂ duct solution:

• Maintenance-free NDIR CO₂ sensor 0–5000 ppm (optional up to 10,000 ppm)
• Automatic aging compensation – long-term precision
• 3-color LED indicator – immediate air quality visibility
• 150 mm duct probe – optimal measurement position
• RS485 Modbus RTU as standard – easy integration
• Temperature –30 to +60 °C (±0.4 °C)
• Humidity 0–100 %RH (±2.5 %RH)
• Dew point directly available
• IP65 housing – resistant to condensation and dust
• 3-year warranty

Technical data:

• CO₂ measurement range: 0 to 5000 ppm
• CO₂ accuracy: ±(50 ppm + 3 % of reading)
• Temperature: –30 to +60 °C (±0.4 °C)
• Relative humidity: 0 to 100 %RH (±2.5 %RH)
• LED indicator: Green ≤1000 ppm | Yellow 1001–1200 ppm | Red ≥1201 ppm
• Duct probe: approx. 150 mm stainless steel
• Communication: RS485, Modbus RTU
• Power supply: 9–30 V DC
• Protection rating: IP65 (electronics)
• Operating temperature: –30 to +60 °C
• Warranty: 3 years

Perfect for:

• HVAC systems and ventilation ducts
• Schools, offices, and open-plan workspaces
• Sports halls and meeting rooms
• Production and storage facilities
• Hospitals and care institutions
• Demand-controlled ventilation according to DIN 1946-6
• Energy optimization and CO₂-based control

Installation – done in minutes

Drill a 25 mm hole into the duct, insert the probe, secure it with a flange or clamp, connect power and RS485 – done. The LED indicator remains visible from outside the duct.

Summary:

• CO₂ concentration transmitter (T-Line WebSensor) for duct mounting
• Transmitter with integrated sensors for CO₂ concentration, temperature, and relative humidity for duct applications
• A multi-stage alignment procedure for CO₂ and temperature ensures excellent CO₂ accuracy across the full temperature operating range
• This is essential for process control and outdoor applications
• The dual-wavelength NDIR CO₂ measurement principle automatically compensates for aging effects. The CO₂ module is highly resistant to contamination, maintenance-free, and offers outstanding long-term stability.

Scope of supply:

• T6445
• User manual
• Traceable calibration certificate
• Free TSensor software for transmitter configuration