•When using new tube sets, run the pump at full speed for 20
to 30 minutes to allow the pump tube to stretch into its final
shape.
•Use the same liquid that you will be using under actual oper-
ating conditions.
•When calibrating at very low flow rates, beware of evapora-
tion. Use a covered container or one with a small surface
area.
•If possible, simulate the pressure differences across the pump
tube that will be experienced under actual operating condi-
tions. Increased back pressure on the outflow side will cause a
slight increase in delivery rate due to tubing dilation, though
this effect is usually less than 1%.
Replacement Parts
Kapton Strips
This amber strip can reduce tube wear and minimize the tendency
for the peristaltic action to walk the tube through the pump,
which can stretch the tube and alter the flow rate calibration. The
strip should never be tight around the rotor. Replacement strips
area available—specify part number KSK. In many cases the
kapton strips may not be necessary.
Tube Sets
Tube sets will typically last about one month under continuous
operation. Dual tube sets place greater stress on the pump motor
than do single tube sets, and thus they may shorten the life of the
motor.
To specify a tube set, first choose the size of tube you need based
on your expected flow rates. Next choose the tube material and
inlet and outlet connectors using the table below. When ordering,
give Instech a part number that specifies: inlet connector–tubing–
outlet connector. For example, LL-020S-22 specifies a single
channel .020” silicone tube with a male Luer lock inlet connector
and a 22 gauge hypodermic tubing outlet connector. Note that
