Sensors 2007, 7(12), 3459-3471; doi:10.3390/s7123459
Article

Use of a Dynamic Enclosure Approach to Test the Accuracy of the NDIR Sensor: Evaluation Based on the CO2 Equilibration Pattern

Received: 7 November 2007; Accepted: 19 December 2007 / Published: 20 December 2007
(This article belongs to the Special Issue Sensors for Urban Environmental Monitoring)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: As part of a quality assurance (QA) study for sensor systems, an enclosureapproach is applied to assess the accuracy of non-dispersive infrared (NDIR)-based CO2sensors. To examine the performance of the sensor system, an enclosure chambercontaining six sensor units of the two model types (B-530 and H-500) was equilibratedwith calibrated CO2 standards at varying concentration levels. Initially, the equilibrationpattern was analyzed by CO2-free gas (0 ppm) at varying flow rates (i.e., 100, 200, 500, and1000 mL min-1). Results of the test yielded a highly predictable and quantifiable empiricalrelationship as a function of such parameters as CO2 concentration, flow rate, andequilibration time for the enclosure system. Hence, when the performance of the NDIR-method was evaluated at other concentrations (i.e., 500 and 1000 ppm), all the sensor unitsshowed an excellent compatibility, at least in terms of the correlation coefficients (r >0.999, p = 0.01). According to our analysis, the NDIR sensor system seems to attain anoverall accuracy near the 5% level. The relative performance of the NDIR sensor for CO2analysis is hence comparable with (or superior to) other methods previously investigated.The overall results of this study indicate that NDIR sensors can be used to provide highlyaccurate and precise analyses of CO2 both in absolute and relative terms.
Keywords: NDIR; accuracy; CO2- equilibration; senso
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MDPI and ACS Style

Pandey, S.K.; Kim, K.-H.; Lee, S.-H. Use of a Dynamic Enclosure Approach to Test the Accuracy of the NDIR Sensor: Evaluation Based on the CO2 Equilibration Pattern. Sensors 2007, 7, 3459-3471.

AMA Style

Pandey SK, Kim K-H, Lee S-H. Use of a Dynamic Enclosure Approach to Test the Accuracy of the NDIR Sensor: Evaluation Based on the CO2 Equilibration Pattern. Sensors. 2007; 7(12):3459-3471.

Chicago/Turabian Style

Pandey, Sudhir K.; Kim, Ki-Hyun; Lee, Sun-Ho. 2007. "Use of a Dynamic Enclosure Approach to Test the Accuracy of the NDIR Sensor: Evaluation Based on the CO2 Equilibration Pattern." Sensors 7, no. 12: 3459-3471.

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