Calibration of Nondispersive Infrared CO2Analyzers with CO2-in-Air Reference Gases
Open Access
- 1 March 1985
- journal article
- Published by American Meteorological Society in Journal of Atmospheric and Oceanic Technology
- Vol. 2 (1) , 82-88
- https://doi.org/10.1175/1520-0426(1985)002<0082:conica>2.0.co;2
Abstract
A set of eight CO2-in-air secondary standard calibration gases has been established by NOAA/Geophysical Monitoring for Climatic Change (GMCC) for use in its global CO2 monitoring program. Use of these gases obviates the need for pressure broadening corrections that arises when CO2 air sample analyses are performed with nondispersive infrared analyzers using CO2-in-N2 calibration gases. The gases are composed of clean mountain air, with suitably adjusted CO2 content, pumped into 49 1 chrome-molybdenum steel tanks to 150 atm pressure. Five of the tank gases have been calibrated manometrically at the Scripps Institution of Oceanography (SIO) to an accuracy of about ±0.10 parts per million (ppm). Calibration of the remaining gases is traceable to manometric primary standards maintained at SIO. The secondary standards are used periodically in Boulder, Colorado, to calibrate tertiary CO2 standards with which, in turn, field station standards and working reference gases are calibrated. Both the tertiary... Abstract A set of eight CO2-in-air secondary standard calibration gases has been established by NOAA/Geophysical Monitoring for Climatic Change (GMCC) for use in its global CO2 monitoring program. Use of these gases obviates the need for pressure broadening corrections that arises when CO2 air sample analyses are performed with nondispersive infrared analyzers using CO2-in-N2 calibration gases. The gases are composed of clean mountain air, with suitably adjusted CO2 content, pumped into 49 1 chrome-molybdenum steel tanks to 150 atm pressure. Five of the tank gases have been calibrated manometrically at the Scripps Institution of Oceanography (SIO) to an accuracy of about ±0.10 parts per million (ppm). Calibration of the remaining gases is traceable to manometric primary standards maintained at SIO. The secondary standards are used periodically in Boulder, Colorado, to calibrate tertiary CO2 standards with which, in turn, field station standards and working reference gases are calibrated. Both the tertiary...Keywords
This publication has 0 references indexed in Scilit: