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5 identical CLOUDS have been modified to produce the CO2 concentration in ppm for the validation measurements. The tests involved exposure to multiple CO2 calibration gas concentrations, start-up testing, auto-calibration validation and stability testing in an office environment. A calibrated Lumasense Innova 1512 was used as reference equipment.

The results

All sensors were exposed to 5 different CO2 concentrations (451, 786, 1044, 1566 and 2000 ppm) and the results are shown below along with the minimum and maximum values ​​according to the specifications.

The sensors' auto-calibration routine assumes a background concentration of 400 ppm, but the concentration at the test site was 410-430 ppm. This has led to a systematic underestimation of the measured value by 10-30 ppm. This can also be seen to affect the measured CO2 value, which is in the lower part of the area in the graph. 5-day stability testing in an office environment showed all measured values ​​within specifications. Start-up tests at CO2 concentrations of 400 ppm and 1800 ppm showed no problems with accuracy after turning off the devices for 9-15 minutes at low or high CO2 concentrations.


The 5 CLOUDS passed the tests performed and were all within the specified accuracy of +/- 50 ppm +/- 3% of reading.

Tests performed and validated by

Jonas Andersen and Casper Laur Building

Bioengineering and Environmental Technology @ Institute of Technology

M: +45 72 20 19 29

ÅBNs CO2-måler, SKYEN, installeret på væg og lyser blåt, med friske blomster i vindueskarm

Solutions that cover your needs

We are experts in behavior and indoor climate. Over the years, we have tailored solutions that cover exactly your needs. We do, among other things:

- Carried out analyzes & action plans

- Installation of SKYEN in institutions, schools, youth education, municipal buildings and seniors' centers

- Delivery of education systems about fresh air for school students

- Preparation of reports and monitoring for the municipality's climate officer

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