The Model 300EU Ultra-Sensitive CO Analyzer is a close derivative of the Model 300E CO Analyzer but with an added auto-zero function and sample conditioner. The reference measurement is used to correct the sample concentration on a user-defined periodic basis; thereby correcting for instrument drift, ambient temperature changes, and changing CO2 levels in the sample. The sample conditioner is used to dry the sample and hence eliminate any effects of humidity changes. The Model 300E is ideal for "background" monitoring in pristine conditions, where ambient CO concentrations can be as low as 30
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