Using AKKR8 for Monitoring Indoor Air Quality
AKKR8 has embedded sensors for measuring various air quality-related parameters, in short AQ. The tech-savvy description is that it has an integrated ultra-low-power digital gas sensor solution which integrates a metal oxide (MOX) gas sensor to detect a wide range of Volatile Organic Compounds (VOCs) for indoor air quality monitoring. The air quality sensor is based on a micro-hotplate technology which enables a highly reliable solution for gas sensors, very fast cycle times and a significant reduction in average power consumption. Now let us look at what this means.
The built-in sensor supports intelligent algorithms to process raw sensor measurements to output total VOC (eTVOC) and equivalent CO2 (eCO2) values, where the main cause of VOCs is from humans. eCO2 and eTVOC are two related measurements. The first stands for equivalent CO2, and it’s an indication of the concentration of CO2. eTVOC stands for equivalent total volatile organic compounds and is a measurement of the total amount of any emitted gases coming from toxins and chemicals.
The built-in AQ-sensor is optimized for low-power consumption, yet you will get much better readings if running from a power supply as we will have more time to get stable models. The AQ-sensor is designed for reliability and a long lifetime.
The AQ sensor measures:
· eCO2 The equivalent CO2 (eCO2) output range is from 400ppm up to 32768ppm.
· eTVOC The equivalent Total Volatile Organic Compound (eTVOC) output range for CCS811 is from 0ppb up to 29206ppb. It can detect Alcohols, Aldehydes, Ketones, Organic Acids, Amines, Aliphatic and Aromatic Hydrocarbons.
Due to the nature of the sensor, measuring air quality regularly and accurately shortens the battery lifetime of the device. Thus we do recommend using this function using a power supply if the intention is to measure often.
We recommend mounting the sensor in a stable environment, in which temperature and relative humidity changes are not abrupt. When moving the sensor to another location, beware that the sensor will take time to stabilise. This may take several days, so take this into consideration.
AKKR8 wakes up at predefined time intervals. The sensor can send every value to the server or be set to read the value, store it and go back to sleep if the value is below an acceptable limit. If the threshold is exceeded, the sensor will force the value to be sent immediately to the server.
What it is not
Like any sensor, this air quality embedded sensor has some limitations. The accuracy will decrease when in presence of heavy VOCs, other pollutants can have the same effect. When used in outdoor environments (with traffic and high levels of sun radiation), the sensor can present an unstable behaviour. Additionally, humidity is known to affect sensor accuracy. The internal humidity correction can limit this effect up to a certain extent, but a perfect correction is not possible. The conclusion is to use it indoors in a normal indoor environment.