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. 2007 Sep 3;7(9):1683-1696.
doi: 10.3390/s7091683.

The Relative Performance of NDIR-based Sensors in the Near Real-time Analysis of CO₂ in Air

Sudhir Kumar Pandey  1 , Ki-Hyun Kim  2
Affiliations

The Relative Performance of NDIR-based Sensors in the Near Real-time Analysis of CO₂ in Air

Sudhir Kumar Pandey et al. Sensors (Basel). .

Abstract

In this study, the reliability of NDIR-based sensors was explored by evaluatingthe comparability between measurement systems in the near real-time analysis of CO₂. Forthis purpose, replicate analyses were performed using sensors of two different model types(H-550 and B-530, ELT Company, Korea). Three replicate data of each sensor typecollected continuously by side-by-side analysis in three second intervals (a duration of 304hour) were evaluated for the relative performance of NDIR sensors. The reproducibility ofsensors, when assessed by relative standard error (RSE %) values of all sensor units,showed moderate changes with time with the overall mean of 2.33%. When CO₂measurements from all NDIR sensor units were evaluated by correlation analysis, theresults showed strong comparability, regardless of the model type. The overall results ofthis study suggest that NDIR sensors are reliable enough to produce highly comparabledata at least in a relative sense.

Keywords: CO2 monitoring; NDIR sensor; performance evaluatio; side-by-side analysis.

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Figures

Figure 1.
Figure 1.
A picture of two different sensor types tested in this study: [A] B-530 and [B] H-550.
Figure 2.
Figure 2.
A comparison of relative performance of six sensor units for CO2 analysis (All results compared in overall mean concentration levels of CO2 (ppm) at hourly intervals) Dotted line represents the grand mean concentration derived from all six sensor units and whiskers represent the standard deviation values from the mean.
Figure 3
Figure 3
a.A comparison of variations in mean hourly concentration values of CO2 measured simultaneously by 6 CO2 senor units for a continuous duration of 304. b.The variation patterns in the mean CO2 levels (ppm) measured in side-by-side analysis with 6 sensor units for the entire study (Results are compared in terms of the daily mean values).
Figure 4.
Figure 4.
The variation in hourly RSE (%) values in the simultaneous measurement of CO2 made by 6 sensor units (Dotted line shows the overall mean RSE value for the entire study).
Figure 5.
Figure 5.
The temporal variation of percent deviation (PD) values derived using hourly mean value of CO2 data measured concurrently by 6 sensor units.
Figure 6.
Figure 6.
Comparison of correlation analysis patterns between different matching pairs of sensor units: the results of three extreme cases are plotted for comparative purpose.
See this image and copyright information in PMC

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