... JB/T8290-1998.C,Inspection areas Can meet the 300mm in diameter less than, length is 2540 mm of small and medium ... liquid7,Longitudinal magnetization coil7.1,A mobile magnetized coil,inner diameter 400mm.8,The human-machine interface control system 11, ... current flow, owe flow appeared when automatic alarm equipment.13,With the phase control power functionFor residual magnetism method detection ...