detect leakage: r11,r12,r22,r23,r134a,r404a,r410,r407c,r502,r507 etc.,different gas(refrigerants) apply to detect leakage all kind of production line : like refrigerator . air condition .water dispenser poduction(assemble) line etc;power source:220v 50hz ,sensitivity :0.5g/y sensor type:infared gas leak detector