Roland R4000 Manual page 21

B0059001 / Rev. 2.3
2.4.4 The clamping device for the tube
Important:
Ensure that the tube is not twisted before lifting the sensor
Possible reasons are:
the tube is mechanically pre-tensioned
•
a residual adhesive force which causes the tube to stick to the sensor when it is withdrawn
•
For drives with a chuck and tapered rollers a brake to stop the tube from turning while the sensor is
withdrawn is normally sufficient.
When the tube is placed on friction roller drive, a separate clamping device is only preventable if
the unloading device grips the tube safely before the sensor is lifted.
2.4.5 The unloading device for the tube
Special attention should be paid to the twist-safe grip and transport of the tube. Reason: The
achieved positioning accuracy at the measuring point is required at the processing station. A poorly
designed transporter device causes angular errors of more than 90 °.
Important:
Comply to positioning accuracy over the entire transportation
2.4.6 Notes on applying eddy current sensors
If the results of the specimen analysis stipulate the use of an Eddy current sensor rather than a
magnetic flux sensor, please note the following:
the distance of the eddy current sensor to the tube surface must be kept constant, for example
•
by using a roller support
the placement for a leakage flux - or combined sensor should be planned in a way to permit
•
easy retrofitting in case of changed tube material
if measured from the inside, no magnetic material is allowed to be present at the measuring
•
point on the outer skin of the tube - exceptions may be clarified with the application laboratory
ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
Weld Seam Detection System R4000 SND40
for Tubes, Cans and Drums
Manual
System description
21