Tongdy CO2 + VOC + RH/T Monitor & Alarm w. Relay

Tongdy CO2 + VOC + RH/T Monitor & Alarm w. Relay
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$299.00 $399.00

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This innovative wall-mount meter transmits, controls and monitors total indoor air quality. Use it to transmit carbon dioxide levels to a demand controlled ventilation system, or use it to monitor air quality with an easy-to-read back lit LCD display. The color changes from green to yellow to red as air quality declines.

Total Volatile Organic Compounds Measurement

In addition to CO2+RH/T, the Tongdy includes a sensor to measure total volatile organic compounds (VOCs). VOCs are typically emitted from building materials, furniture and carpet, and include gases like ammonia, formaldehyde, cigarette smoke, alcohol hydrogen sulfide, and carbon monoxide. By monitoring both CO2 and VOCs, you can guarantee your occupants health, comfort and safety.

With its industry standard outputs, the Tongdy is a cost-effective, all-in-one solution for monitoring IAQ in offices, meeting rooms, classrooms, or anywhere air quality is important.


  • Real-time Carbon Dioxide Level Transmitter & Monitor
  • VOC Sensor Monitors Volatile Organic Compounds
  • Temperature and % Relative Humidity
  • Buzzer & Visual Alarm plus Relay


  • CO2: 0-5,000ppm
  • Accuracy: ± 60 ppm ± 3 % of reading
  • TVOC: 0-30ppm
  • Temperature: -20 to 60°C (-4 to140°F)
  • Accuracy: ± 0.5% of reading
  • Humidity: 0-100% RH (non-condensing)
  • Accuracy: ± 4.5% of reading

Electrical / Mechanical

  • Dimensions: 130mm (H) × 85mm (W) × 36.5mm (D), 200g
  • Power Input: 110-220 VAC @ 3.5 W Max, 2.8 W Avg
  • Relay:  3A rated switching current, resistance loaded
  • Housing: PC/ABS fireproof plastic material; protection class: IP30
  • Maintenance Interval: No Maintenance Required
  • Standard: CE-Approved


  • 1 Year

Datasheet Data Sheet (pdf)

Datasheet Manual (pdf)