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GN8010-R Wireless Type gas detector        ■ Dimension & Mounting(Unit:mm)：       ■ Wiring terminals：     Terminal No. J1(Four wires) Foot 1 2 3 4 5 6 Symbols V+ V+ DA DB V- V- Note Power Cathode RS485 + RS485 － Power to Power to   ■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。