Monitoring indoor air quality with battery-power

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Lufft OPUS20 TCO records and shows the CO2 amount in the room air

Everyone knows it: A long discussion, a lecture or a lesson. Many people sit in a room, and after an hour come big yawns. The concentration fades, the performance of each individual collapses. If the redemptive call for an open window comes up finally from the group, they will be torn up and redeeming fresh air can flood into the room. It is often mistakenly thought, that the reason of the tiredness is a lack of oxygen concentration in the room. But this is far from being the case.

When we breathe out, the air we breathe contains about 6 percent of CO2, which makes the room air content critical in very short time. Fresh air from the outside contains about 400 ppm CO2. In “used air” this value increases rapidly up to 10 times higher CO2 levels, with dramatic consequences for the well-being. Consequently the indoor air quality standard DIN EN 13779 classifies different quality levels for non-residential buildings. With an increase of CO2 concentration by 1000 ppm only, the indoor air quality is classified as low already by this standard. Furthermore, it is undisputed that fatigue, a lack of concentration as well as other impairments can be expected within concentrations levels of 1500 ppm. Higher concentrations may not only affect the well-being, but also cause damage to health or are even life-threatening.

In addition to the air temperature and relative humidity in rooms it’s clear now, that the CO2 amount influences the indoor air quality significantly. And only systematic airing can improve the indoor air quality. However, especially in the cold winter months, this is often neglected. For this case, a measuring instrument such as the Lufft OPUS20 TCO can help a lot. This data collector records the CO2 content [ppm] of the room air in addition to the air temperature and the precise relative humidity meticulously. Furthermore, the monitor is able to trigger an audible alarm if a predetermined threshold value is exceeded, in order to remind of ventilating the interior. The records can always be read with the included Windows software SmartGraph3 over a network LAN or USB connection. The measuring principle of the built-in CO2-measuring cell is based on a newly developed non-dispersive infrared sensor which is directly influenced by the analysis gas CO2. The specific wave length absorption on the infrared wavelength range taking place through the CO2 in the air is detected precisely in the measuring cell electro-optically and processed in the meter digitally.  The built-in CO2 measuring cell has a patented auto-calibration and thus guarantees a particularly high long-term stability.

Energy efficiency is also one of the most ambitious development goals, the data logger with its special measuring cell reached. Normally, long-term stable CO2 monitors require external power supplies, for example in the form of a plug-in power supply, because of their high energy needs. Due to the energy-efficient design, OPUS20 TCO can run in independent operation for at least three months, if equipped with the suitable batteries. This allows the meter to be mounted anywhere with no mains connection and free of lead lines. Since the Lufft OPUS20 TCO allows easy wall mounting on DIN rails, the data logger is an ideal supplement for rooms in which many people stay regularly. An optional anti-theft device is also available. As already shown, the meter has built-in temperature [°C/ °F] and relative humidity sensors [% r.H.]. In conjunction with the likewise integrated CO2 measurement technology, OPUS20 TCO allows a continuous monitoring of indoor air quality.

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