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CO2MC 24V & Free Remote – CO2, Temp & RH Monitor

The Duomo CO2MC 24V has been developed to monitor levels of Carbon Dioxide in offices, schools, kitchens or labs. This is the 24V version, also available in 230V. The monitor has a backlit traffic light display. As CO2 levels increase the backlight will change from green to Yellow. If the levels continue to rise the backlight will change to red.

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The CO2MC 24V Monitor & Controller actively monitors CO2 levels, temperature, and humidity in a room. This is the 24V version, there is a 230V CO2MC version too.

There are four CO2MC 24V model options to choose from:

  • CO2MC-R: Designed for monitoring room environments.
  • CO2MC-K: Specifically built for kitchens.
  • CO2MC-L: Ideal for laboratory settings.
  • Custom setpoints option: Tailored to specific requirements.

Key features of this monitor include an audible alarm and a backlit traffic light display. It also provides an on/off volt-free relay output that controls ventilation systems.

The monitor can be customized or pre-set for standard use cases like kitchens, school classrooms, and laboratories.

Users can determine when ventilation is needed, giving them control over the process. This is especially useful when automatic ventilation systems are not installed or when occupants prefer manual control.

The monitor adjusts display colours based on setpoints determined by the location. For example, classrooms or kitchens may have different setpoints for colour changes, indicating the need for additional ventilation.

For CO2 and temperature analogue output of 0-10V, consider the TLD1 model. The CO2MC 24V Monitor & Controller features a three-color (green/yellow/red) LCD backlight that indicates ventilation requirements based on CO2 measurements.

The monitor uses non-dispersive infrared sensing technology for accurate CO2 detection. It offers a relay output to control a ventilator. The digital display shows CO2 levels in parts per million (ppm), as well as temperature and humidity readings.

When necessary, the monitor alerts users with dual alarm indications: an audible alarm and a colour switch on the backlight.

The monitor is designed for easy operation, featuring user-friendly touch buttons. It can be placed on a desktop or mounted on a wall to suit preferences.

With a 3-year guarantee, the CO2MC 24V Monitor & Controller ensures long-term reliability and performance.


Product Details

  • Three colour (green/yellow/red) LCD backlight indicating ventilation requirement based on CO2 measurement
  • Non dispersive infrared sensing technology
  • Relay output to control a ventilator
  • Digital display of carbon dioxide levels (ppm)
  • Temperature and humidity monitoring
  • Dual alarm indication; audible alarm and backlight colour switch
  • Easy touch button for operation
  • Desktop or wall mounted


Onsite Diagnostics

If you require onsite diagnostics or technical assistance with any of our products please contact us

  • This field is for validation purposes and should be left unchanged.


We recommend Duomo Gas Detection products are serviced at least annually to ensure efficacy and extend sensor life. Our qualified team of engineers are available Nationwide.



  • CO2MC (24V AC/DC) Datasheet

    223.86 KB | pdf

  • CO2MC Model Selection

    28.65 KB | pdf

  • CO2MC Advanced settings guide

    558.42 KB | pdf



What is the recommended mounting height for a CO2MC?

For wall mounting, please follow the steps on the datasheet (see tab). Cut off the power supply and place a flat head screwdriver deep inside of the hole on the
bottom of the monitor casing, then depress the clip lightly to remove the face plate from the wall plate.

Mount the back plate on the wall, 1.2 – 1.3m from the ground (please see dimensions on previous page). Connect wires to the terminal block making sure that all connections are correct and secure. After finishing the mounting of the unit, follow the steps to close the cover.

Do not mount this unit;
behind a door,
in a corner,
near a heat source, diffuser or any steam source,
in direct sunlight,
near garbage bins,
near gas ovens.

What are the different models available for the CO2MC 230V Monitor & Controller?

There are four CO2MC model options to choose from: CO2MC-R, designed for general room/ office environments; CO2MC-K, built specifically for kitchens; CO2MC-L, ideal for laboratories; and a custom-setpoints option, tailored to specific requirements.

Can the setpoints be customised?

Yes, users have the option to customise or pre-set the monitor for standard use cases, such as kitchens, school classrooms, and laboratories. Setpoints for controlled ventilation can be determined by the user, providing control over the ventilation process.

How is the CO2MC 230V Monitor & Controller powered?

The CO2MC Monitor & Controller is powered by a 230V power source.

What technology does the CO2MC 230V Monitor & Controller use?

The monitor uses non-dispersive infrared sensing technology for accurate CO2 detection, providing real-time measurements displayed in parts per million (ppm). This is coupled with sensors for temperature and humidity.

Does the monitor only indicate CO2 levels?

Besides CO2, the digital display also shows temperature and humidity readings, thus offering comprehensive environmental monitoring.

Is there a warranty or guarantee for the CO2MC 230V Monitor & Controller?

The CO2MC 230V Monitor & Controller comes with a three-year guarantee, thus ensuring long-term reliability and performance.

Please remember to consult the user manual or contact customer service for more specific and detailed information about your device.


Support & Service

If you require technical assistance or an annual service on this product please contact us and we will be happy to help. Our qualified team of engineers are available Nationwide.

Duomo (UK) Ltd

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