Gas alarm Hot wire type sensor Power vac/ vac/ vac v- vdc Working temperature: - degree~ degree Alarm density: coal gas: ~ ppm, liquid petroleum gas: ~ ppm, natural gas: ppm~ ppm Circuit for normally closed rely contacts Circuit for normally opened rely contacts Size: mmx mmx mm Weight: g/pcs Package size: . Cm* . Cm* . Cm Quantity/box: pcs Ctnweikg: kg