GN8030-C Combustible Gas Detector        ■ Dimension & Mounting(Unit:mm)：     Terminal No. J1 Foot 1 2 3 4 Symbols V+ V- DA DB Note Power Cathode Power to RS485 + RS485 -     ■ The type of gas：   Natural gas(LNG) LPG Gas Alkanes Alcohol Acetone Benzene Gasoline Volatile liquid Hydrogen Ammonia Carbon monoxide Carbon dioxide Hydrogen sulfide Oxygen Nitric oxide Nitrogen dioxide Sulfur dioxide Chlorine Formaldehyde Other combustible gases   These commonly used for gas, other gases information, please see《 Schedule Gas Detection 》Or Call Advisory。