Duct CO2 Transmitter CDK 24-Series

• Optical NDIR sensor for precise CO2 detection.
• Measuring range: 0-2,000 ppm or 0-5,000 ppm (jumper selectable).
• Output options: 0-10 Vdc or 4-20 mA (jumper selectable).
• Automatic calibration with ABC logic (default) and manual calibration option.
• Energy-efficient design facilitates ventilation on an as-needed basis, reducing costs and enhancing comfort.

• The first line shows the measured CO2 value in ppm.
• The second line displays relay status (● = energized, ○ = de-energized), CO2 indicator (C), and the configured switch point value.

• Power Supply: 24 Vac/dc (+/-10%).
• Power Consumption: Typical <1.5W / 24 Vdc or <2.9 VA / 24 Vac.
• Sensor Technology: Optical NDIR sensor with automatic calibration.
• Measuring Accuracy: ±30 ppm ±3% of measured value at 25°C.
• Temperature Dependence: ±5 ppm/°C or ±5% of measured value/°C, whichever is higher.
• Pressure Dependence: ±0.13% / mm Hg.
• Long-Term Stability: <2% over 15 years.
• Response Time: 1 minute.
• Ambient Temperature Range: -10 to +60°C.
• Warm-Up Time: 1 hour.

• Enclosure:
  • Material: Polyamide, 30% glass-globe-reinforced.
  • Dimensions: 72 x 64 x 37.8 mm.
  • Protection Type: IP 65 (EN 60 529).
  • Cable Gland: M16 x 1.5, with strain relief.
• Protective Tube: Polyamide (PA6), Ø20 mm, length 202.5 mm, with torsion protection.
• Process Connection: Includes a plastic flange for secure duct installation.

The CDK 24-Series is designed for standard applications, such as monitoring CO2 levels in residential rooms and conference rooms. It enables energy-efficient room ventilation based on actual air quality, improving well-being and reducing operating costs.

• CDK 24
  Duct carbon dioxide (CO2) transmitter 0-120 Vdc or 4-20 mA output
• CDK 24D
  Same as CDK 24 and with
  display for real-time CO2 monitoring and relay status visualization.