Thermo Scientific Dionex UltiMate 3000 Series Operating Instructions Manual page 195

7. Reconnect the seal wash tubing to the detector.
Be sure to connect the tubing to the inner port (→ Fig. 66). The outer port has no
function.
Tip: If leakage from a pump head is observed, check also the tubing connected to
the rear seal wash system. If the seal wash tubing is not connected properly or
if the tubing is crimped or kinked, the liquid may leak into the pump.
Loading pump
4. If you want to perform the test for the loading pump, make sure that the following
conditions are fulfilled:
♦ The NC pump is not delivering.
♦ The pressure of the NC pump is down to zero.
5. Set the flow rate. Arrange the system in such a way that approximately 30 MPa of
backpressure is produced.
6. To evaluate possible leakage, observe the air/liquid level in the silicone tube. Finish
the observation before a new seal wash cycle starts.
♦ If the level remains unchanged, the piston seals seal tightly.
Proceed with the next step.
♦ A rising level indicates leakage from one or more piston seals.
Replace the piston seals (→ page 194).
7. Reconnect the seal wash tubing to the detector.
Be sure to connect the tubing to the inner port (→ Fig. 66). The outer port has no
function.
Tip: If leakage from a pump head is observed, check also the tubing connected to
the rear seal wash system. If the seal wash tubing is not connected properly or
if the tubing is crimped or kinked, the liquid may leak into the pump.
Operating Instructions
UltiMate 3000 Series:
NCS-3500RS and NCP-3200RS
Page 187