For monitoring an atmosphere for approach to the lower explosion limit and for the presence of toxic gases and oxygen deficiency. Measuring ranges: - CH4: 0-100% LEL - CO2: 0-5 vol.% (if Dual IR sensor option is selected) - CO: 0-300 ppm (optional) - H2S: 0-100 ppm (optional) - O2: 0-25 vol.% (optional) Resolutions: - CH4: 0.1 or 0.01% LEL - CO2: 0.1 vol.% - CO: 1 ppm - H2S: 0.1 ppm - O2: 0.1 vol.%