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A low cost and networkable CO/sub 2/ monitor is developed, which consists of a non-dispersive infrared (NDIR) sensor and a network interface. It measures the CO/sub 2/ concentration by spectrum absorption in the 4.26 /spl mu/m band due to CO/sub 2/ molecules in the air. On-line calibration, the access to the TEDSs defined in IEEE 1451.2 standard and measured data are made by Java applet and client programs in C language. The prototype monitor has durability and long term stability with a measurement accuracy of /spl plusmn/(30ppm+2%) over the CO/sub 2/ concentration range from 380 ppm to 5000 ppm.
Wang et al. (Sat,) studied this question.
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