Comparison of the Characteristics of Small Commercial NDIR CO2 Sensor Models and Development of a Portable CO2 Measurement Device

Abstract

Many sensors have to be used simultaneously for multipoint carbon dioxide (CO2) observation. All the sensors should be calibrated in advance, but this is a time-consuming process. To seek a simplified calibration method, we used four commercial CO2 sensor models and characterized their output tendencies against ambient temperature and length of use, in addition to offset characteristics. We used four samples of standard gas with different CO2 concentrations (0, 407, 1,110, and 1,810 ppm). The outputs of K30 and AN100 models showed linear relationships with temperature and length of use. Calibration coefficients for sensor models were determined using the data from three individual sensors of the same model to minimize the relative RMS error. When the correction was applied to the sensors, the accuracy of measurements improved significantly in the case of the K30 and AN100 units. In particular, in the case of K30 the relative RMS error decreased from 24% to 4%. Hence, we have chosen K30 for developing a portable CO2 measurement device (10 × 10 × 15 cm, 900 g). Data of CO2 concentration, measurement time and location, temperature, humidity, and atmospheric pressure can be recorded onto a Secure Digital (SD) memory card. The CO2 concentration in a high-school lecture room was monitored with this device. The CO2 data, when corrected for simultaneously measured temperature, water vapor partial pressure, and atmospheric pressure, showed a good agreement with the data measured by a highly accurate CO2 analyzer, LI-6262. This indicates that acceptable accuracy can be realized using the calibration method developed in this study.

NDIR Gas Sensor for Spatial Monitoring of Carbon Dioxide Concentrations in Naturally Ventilated Livestock Buildings

“…In the studies of Piccot et al . [31] and Yasuda et al . [32], several different commercially available NDIR CO 2 sensors were compared with a reference method in the laboratory, and concluded that concentrations measured with all sensors agreed well with that of the calibration gas.…”

Intra-molecular hydrogen bonding stabilization based-fluorescent chemosensor for CO 2 : Application to screen relative activities of CO 2 absorbents

“…Accordingly, a large number of materials have been developed as potential CO 2 absorbents [60]. It is important to efficiently select CO 2 absorbents from a large number of candidates because selection is time consuming M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 12 and requires expensive instruments such as a NDIR-gas analyzer, GC-MS, and thermogravimetric analyser [61][62][63][64]. To address these problems, the proposed CO 2 chemosensor was applied to develop an easy screening protocol to evaluate the efficiency of CO 2 absorbents.…”

Effects of experimental warming on soil respiration and biomass in Quercus variabilis Blume and Pinus densiflora Sieb. et Zucc. seedlings

“…In April 2010, a total of 16 experimental plots (1 × 1 m with a 2-m buffer between the plots) were established. The soil temperature at a depth of 5 cm and the volumetric soil moisture content at depths from 0 to 10 cm were monitored in the center of each experimental plot using soil temperature sensors (108-LC, Campbell Inc., USA) and soil moisture sensors (CS616, Campbell Inc., USA) (n = 16), respectively (NDIR) CO 2 sensor (GMP343, Vaisala CARBOCAP, Finland), which has high selectively and sensitivity in openair conditions (Yasuda et al 2012), and a small chamber made of polyacrylics. The sensors were well calibrated at least once a year with standard CO 2 gases.…”