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Guardian NG is a stand-alone analyzer with infrared sensor technology for CO2. It is easy to install and require only a minimum set up. It has an integrated LCD display and digital alarm set-point controls. The Guardian is housed in a sturdy plastic IP54 case in order to avoid infiltrations of water or particles. The version EDI080116NG has range 0-100%. and it is specifically calibrated for Biogas ambient, considering the presence of methane.