... 1.Induced GasaaCoal gas, natural gas, LPG 2.Alarm density Error: <=5%LEL 3.Resume density:8% LEL ... gas, natural gas, LPG6. Alarm mode: flash & sound alarm,automatically shut-off gas valve, network alarm signal output7. Alarm density Error: ≤±5%LEL8. ... Stability: long-time working alarm density ...