Watson-Marlow 720UN and 720SN User Manual
73
Re-tensioning the tubing
Start the pump, allowing any excess tubing to work through the pumphead, then
press down the delivery end clamp firmly. Check the tube for movement when the
pump is running. If tubing moves through the pumphead, the tube should be more
firmly clamped at the suction end. The delivery end should be unclamped to release
any excess tubing, pulled tight and then firmly re-clamped again. Repeat as neces-
sary.
When using Marprene continuous tubing,
after the first 30 minutes of running, re-
tension the tube in the pumphead by re-
leasing the tube clamp on the delivery side
a little and pulling the tube tight. This is
necessary to counteract the normal stretch-
ing that occurs with Marprene which can go
unnoticed and result in poor tube life.
