... Apparatus for Steel Cylinder 16- Channel Ultrasonic Flow Detecting Line for Steel Cylinder1Test channel: 16 channel Range: ... entire sweep range Rectification: Positive halfwave, negative halfwave, fullwave, RF System Linearity: Horizontal: +/-0.2% FSW, Vertical: 0.25% FSH, Amplifier ... /pc (take the length of the cylinder as 2000mm) Automatic Ultrasonic Detecting Apparatus for Steel Cylinder