Tongdy CO2 Indicator/Controller with Relay

Tongdy CO2 Indicator/Controller with Relay
Click to enlarge.

  • TON-0007

  • TON-0007-WP

For large quantities, please contact

Browse more CO2 Monitor or additional Tongdy products.


  • Real-time Carbon Dioxide Level Control & Monitor
  • Six Colored LEDs to Easily Check Indoor IAQ
  • Built-in Relay to Control Fresh Air Fan

The Tongdy CO2 Indicator/Controller lets you simply and easily monitor and control indoor air quality.

  • Use it to visually monitor air quality with its easy-to-read colored LEDs that quickly change from green to yellow to red as indoor air quality declines.
  • Use it to control ambient carbon dioxide levels with its on/off relay output to operate a fan control.

With its one-button on/off/auto ease of use and industry-standard 24V power requirements, the Tongdy CO2 Indicator/Controller with Relay is perfect for homes, offices, meeting rooms, classrooms, or anywhere monitoring and controlling indoor air quality is important for occupant's comfort.


  • Non-Dispersive Infrared (NDIR)
  • Sampling Method: Diffusion
  • Range: 0 – 2,000 ppm
  • Accuracy: ± 30 ppm ± 3 % of measured value
  • Life Expectancy: > 15 years


  • 1st green light <600ppm, 1st and 2nd green lights 600-800ppm, 1st yellow light 800-1200ppm, 1st and 2nd yellow lights 1200-1400ppm, 1st red light 1400-1600ppm, 1st and 2nd red lights >1600ppm

Electrical / Mechanical

  • Power Input: 24VAC/VDC
  • Output Relay: <240VAC/30VDC 3A Switching Current
  • Output Relay Control: 800ppm to 1400ppm via jumpers
  • Additional Outputs: Use Model TON-0001
  • Housing: PC/ABS fireproof plastic; protection class: IP30
  • Maintenance Interval: No Maintenance Required
  • Dimensions: 100mm (H) × 80mm (W) × 28mm (D) or 2x4" wire box
  • Standard: CE-Approved


  • 1 Year