Guardian NG is a stand-alone analyzer with infrared sensor technology for CH4. 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 EDI080205NG-BIO has range 0-100% and it is calibrated specifically for Biogas ambient, considering the presence of carbon dioxide.