Welcome to our big CO2 detector test 2021. Here we present all the CO2 detectors we have tested in detail. We have compiled detailed background information and added a summary of customer reviews on the web.
We would like to make your purchase decision easier and help you find the best CO2 detector for you.
You will also find answers to frequently asked questions in our guide. If available, we also offer you interesting test videos. Furthermore, you will also find some important information on this page that you should definitely pay attention to if you want to buy a CO2 detector.
- 1 Weekly newsletter with the best personal finance tips
- 2 Summary
- 3 The Best CO Detector: Our Picks
- 4 Guide: Questions you should ask yourself before buying a CO2 detector
- 4.1 What is a CO2 detector?
- 4.2 How is carbon dioxide produced and why should you measure it?
- 4.3 For whom is a CO2 detector suitable?
- 4.4 Up to what CO2 level is air considered clean?
- 4.5 What is the difference between a CO2 detector and a CO detector?
- 4.6 What does a CO2 detector cost?
- 4.7 How many CO2 detectors should you buy?
- 5 Decision: What types of CO2 detectors are there and which is the right one for you?
- 6 Buying criteria: You can compare and evaluate CO2 detectors based on these factors
- 7 Facts worth knowing about CO2 detectors
- A CO2 detector measures the amount of carbon dioxide in the air and sounds an alarm as soon as a certain concentration is reached.
- Basically, a certain amount of carbon dioxide in the air (approx. 500-1000 ppm) is normal and harmless. However, at higher levels (2500-3000 ppm and above), headaches or shortness of breath may occur.
- In closed rooms, the air deteriorates imperceptibly. A CO2 detector alerts you to too high a concentration of carbon dioxide, reminds you to ventilate and ensures that you are spared annoying headaches due to carbon dioxide.
The Best CO Detector: Our Picks
Guide: Questions you should ask yourself before buying a CO2 detector
What is a CO2 detector?
When a certain level of carbon dioxide is exceeded, the CO2 detector sounds an alarm. In this way, you are optimally protected against carbon dioxide poisoning and can better control the quality of the indoor air.
How is carbon dioxide produced and why should you measure it?
But carbon dioxide can also be produced by cellular respiration in plants, animals or humans. A single person alone exhales an average of about 15-20 litres of air per hour during a sedentary activity, thus adding more than a hundred times the amount of CO2 to the air.
The amount of carbon dioxide emitted per day by a single person is therefore equivalent to the amount emitted by a small car travelling ten kilometres.
Carbon dioxide in rooms is not dangerous for the environment, but in too high a concentration it impairs our well-being. For an optimal indoor climate, especially in rooms where many people are present, a CO2 detector is definitely an advantage.
For whom is a CO2 detector suitable?
In the following commercial sectors/locations, the installation of a CO2 detector is particularly important, as larger amounts of CO2 can accumulate here and this represents a considerable health hazard:
- Wine cellars
- Feed silos
With a CO2 detector you can also save energy in your own home. Many households have demand-controlled ventilation. You can adjust this according to the measured values of the CO2 detector. In this way, you always ventilate when the carbon dioxide content has reached a certain threshold.
Due to the reduced exchange with fresh outside air, a larger amount of carbon dioxide is produced very quickly in closed, well-insulated rooms.
Up to what CO2 level is air considered clean?
|CO2 concentration||Air quality/possible symptoms|
|Up to 300 ppm||Very fresh air|
|Up to 1000 ppm||Acceptable room air (ventilation becomes necessary)|
|Up to 1500 ppm||Maximum value for acceptable room air (ventilation becomes urgently necessary|
|Up to 2500 ppm||Headaches may occur|
|Up to 5000 ppm||Breathing difficulties may occur|
You can use 1000 ppm as a simple guideline. The carbon dioxide concentration in the room air should not exceed this value.
What is the difference between a CO2 detector and a CO detector?
Carbon monoxide is a colourless, poisonous and odourless gas that is produced when substances containing carbon are burnt. Even low concentrations of carbon monoxide can lead to carbon monoxide poisoning without you noticing.
We recommend that you use an additional CO detector in addition to a CO2 detector to check the air quality.
Note that a CO detector and a CO2 detector measure different gases. They are two completely different devices that must be purchased separately.
Unlike CO detectors, which are mounted on the ceiling like smoke detectors, you should place a CO2 detector near the floor. This makes sense because the gas carbon dioxide is heavier than air and is deposited on the floor.
What does a CO2 detector cost?
CO2 detectors cost between 70 and 200 euros. Portable CO2 detectors are the cheapest. Some models can be bought for as little as 70 euros. Multifunctional or recording CO2 detectors are usually considerably more expensive. Here, the price is approximately between 130 and 200 euros.
In the following table, we have summarised the prices for the different models of CO2 detectors:
|Multifunctional CO2 detector||approx. 150 - 200 €|
|Recording CO2 detector||approx. 130 - 200 €|
|Portable CO2 detector||approx. 70 - 90 €|
How many CO2 detectors should you buy?
Air quality should also play a major role in children's rooms. Here, it is advisable to install a CO2 detector that you can connect to an app on your mobile phone. This way you can track the values anywhere and at any time.
Decision: What types of CO2 detectors are there and which is the right one for you?
If you want to get a CO2 detector, there are three models you can choose between:
- Multifunctional CO2 detector
- Recording CO2 detector
- Portable CO2 detector
What are the advantages and disadvantages of each model?
Multifunctional CO2 detector
Multifunctional CO2 detectors are not only limited to measuring carbon dioxide, but also show you additional values such as temperature or humidity. Some of these models also have a time and alarm function.
However, these devices only cover a CO2 content of up to 5000 ppm. This is, however, completely sufficient for living and sleeping areas, schools or offices. The measuring rhythm is also somewhat slower with this variant of a CO2 detector than with other models.
Recording CO2 detector
If an exact overview of the development of the CO2 concentration is needed, one should take a look at recording CO2 detectors. These models store the measured CO2 content of the room air and show the progression of the air quality on their display.
Recording CO2 detectors usually cover a larger measuring range than multifunctional devices and have a faster measuring rhythm. They are therefore somewhat more expensive to purchase.
The purchase of a recording CO2 detector makes sense primarily where precise and regular control of the CO2 content is required. Examples of this are cellars with wood gasification boilers or the ownership of a pellet heating system.
Portable CO2 detector
Especially if several rooms are to be checked for CO2 concentration, the C02 detector powered by batteries or rechargeable batteries is a good choice. A portable CO2 detector is also the perfect companion for irregular checks of rooms or in caravans / mobile homes.
Portable CO2 detectors are also characterised by a particularly fast measuring rhythm and are significantly cheaper to purchase than other models of CO2 detectors.
Buying criteria: You can compare and evaluate CO2 detectors based on these factors
- LED display
- Evaluation of the measured values via app
- Recording function
- Configurable alarm
- Measuring range / measuring rhythm
With the help of an LED display, you can see directly at first glance and even from a distance how the respective CO2 value is.
Many models now have an LED traffic light display. This gives you a direct and accurate impression of the CO2 concentration in the room air. We therefore recommend that you buy a CO2 detector with LED display as well as an LED traffic light display.
Evaluation of the measured values via app
Various CO2 detectors now offer this function. This is practical if you want to check the CO2 values in your home while on the road. It can also be an advantage during longer holidays to be able to take a look at the CO2 values at home.
This device is really worthwhile especially for houses with pellet heating or other sources of danger for increased CO2 emissions.
With a recording function, you can see the values of the last 24 hours as well as the current maximum and minimum values of the CO2 concentration in the room air.
This makes it easier to find out how often you should ventilate and how long it takes for the carbon dioxide level to return to normal. Especially in buildings where there are many people, a CO2 detector with a recording function can provide a great deal of information about optimal ventilation.
A configurable, user-defined alarm is another purchase criterion you should think about before buying a CO2 detector.
With the help of a configurable alarm, you can set your own alarm values and know at any time and, above all, in good time how the carbon dioxide content of the air of the corresponding interior is.
If the CO2 detector is connected to the ventilation system, you can ensure optimal ventilation around the clock, even if you are not on site.
Measuring range / measuring rhythm
Measuring range and measuring rhythm are also important if you are considering buying a CO2 detector. As a rule, CO2 detectors have either a measuring range up to 5000 ppm or a measuring range up to 10000 ppm.
Depending on the place of use, you need to weigh up how accurate the measurement results should be. This is where the measurement frequency comes into play. The more frequent the measurements, the more accurate the results.
For exact measurement results, especially in buildings where many people are present or for professional use in the catering industry or agriculture, we recommend a CO2 detector with a large measurement range and a fast measurement rhythm.
Facts worth knowing about CO2 detectors
What should I do if the CO2 detector sounds the alarm?
First of all, you should quickly open the window and ventilate well. This usually solves the problem of too high a concentration of carbon dioxide in the room air.
However, to prevent this, you should ventilate regularly and, above all, properly. We recommend that you fully open the windows 3-4 times a day for about 10 minutes, regardless of the season.
Can I also use a CO2 detector as a fire detector?
No, CO2 detectors and fire or smoke detectors have different functions because they work with different sensors. A CO2 detector measures the carbon dioxide content and displays the corresponding value.
A smoke or fire detector, on the other hand, sounds an alarm as soon as smoke is detected.
In the following video you will find more information about installing smoke detectors.
Picture source: Raths/ 123rf.com