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MICA has a TVOC sensor that provides relative measurements. Similarly, the specifications are detailed in TVOC Index units, with an accuracy of ± 15 Index points or ± 15% of the measured value, whichever is greater, for the entire set of VOCs. For its part, WELL requires minimum sensor requirements and an accuracy ± (20 μg/m3 + 15% m.v.) between the range of 1 to 500 μg/m3. In order to ensure compliance with WELL requirements with the MICA relative measurement sensor, the characteristics of the sensor and its performance against concentrations of the specific WELL gas, which is actually a mixture of gases called Mølhave[1], are studied.
This study results in an accuracy of ± 10 Index points in the range of 1 to 500 μg/m3 for the MICA sensor.
This accuracy in relative units is converted to mass concentration units by means of the sensor's Index Points conversion formula and conversion ratios, as detailed below.
Thus, after applying the corresponding conversions, the following graphical representation of the error versus concentration in µg/m³ is obtained, where it can be seen that the MICA sensor meets the WELL accuracy requirements.
[1] Mølhave, L., Clausen, G., Berglund, B., De Ceaurriz, J., Kettrup, A., Lindvall, T., Maroni, M., Pickering, A.C., Risse, U., Rothweiler, H., Seifert, B. and Younes, M. (1997), Total Volatile Organic Compounds (TVOC) in Indoor Air Quality Investigations†. Indoor Air, 7: 225-240. https://doi.org/10.1111/j.1600-0668.1997.00002.x