Next Article in Journal
Combination of On-line pH and Oxygen Transfer Rate Measurement in Shake Flasks by Fiber Optical Technique and Respiration Activity MOnitoring System (RAMOS)
Next Article in Special Issue
Application of Multiplexed FBG and PZT Impedance Sensors for Health Monitoring of Rocks
Previous Article in Journal
An Overview of Label-free Electrochemical Protein Sensors
Previous Article in Special Issue
Tempo-Spatial Patterns of Land Use Changes and Urban Development in Globalizing China: A Study of Beijing
Article Menu

Export Article

Open AccessArticle

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

Dept. of Earth & Environmental Sciences, Sejong University, Seoul, Korea
Dept. of Applied Mathematics, Sejong University, Seoul, Korea
Author to whom correspondence should be addressed.
Sensors 2007, 7(12), 3459-3471;
Received: 7 November 2007 / Accepted: 19 December 2007 / Published: 20 December 2007
(This article belongs to the Special Issue Sensors for Urban Environmental Monitoring)
PDF [351 KB, uploaded 21 June 2014]


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. View Full-Text
Keywords: NDIR; accuracy; CO2- equilibration; senso NDIR; accuracy; CO2- equilibration; senso
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

Share & Cite This Article

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.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top