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The GCD-9400 automatic monitoring system for non methane total hydrocarbons in ambient air adopts valve switching and back blowing technology, using non methane total hydrocarbons to separate peaks and directly measure concentrations (direct method). Paired with an efficient hydrocarbon removal instrument (with a removal efficiency of 99.9%), it can reduce background noise and improve equipment detection accuracy. The detection limit for non methane total hydrocarbons can reach ≤ 10 PPb.
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