... description:The combined detector works flammable gas detector, detect such as lpg, city gas, natural gas etc. the core components are high ... carbon monoxide sensor. it can monitor the presence of flammable gas precisely, such as methane, propane, butane, hydrogen, carbon monoxide ... 10%~90%rh 7) Sensor: senmiconductor co and gas sensor 8) Type of gas be detected: carbon monoxide, lpg, ng(lng), ...