Visually Inspecting The Pump For Piston Seal Leakage - Thermo Scientific Dionex UltiMate 3000 Series Operating Instructions Manual

UltiMate 3000 Series:
NCS-3500RS and NCP-3200RS

7.6.1 Visually Inspecting the Pump for Piston Seal Leakage

You can inspect the pump visually for liquid leaks from the piston seals.
1. Flush the rear seal wash system with the seal wash solution.
a) Remove the seal wash tubing from the detector.
Detector of the
seal wash system
b) Draw seal wash solution into a syringe at the open end of the tubing. Press the lever of
the peristaltic pump to the right so that the liquid can easily pass the system.
2. Remove some of the liquid by shaking the tube.
3. Follow the appropriate steps for the pump for which you want to perform the test:
♦ NC pump: See further down on this page
♦ Loading pump: See page 187.
NC pump
4. If you want to perform the test for the NC pump, make sure that the following
conditions are fulfilled:
♦ The loading pump is not delivering.
♦ The pressure of the loading pump is down to zero.
5. Purge the flow meter (→ page 75).
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. Follow these steps:
a) On the right pump head, remove the seal wash tubing connecting the left pump
head to the right pump head.
b) Repeat the observation.
c) If the level rises again, replace the piston seals in the left pump head
(→ page 194) and repeat the test starting with step 1. If the level does not rise,
replace the piston seals in the right pump head and repeat the test starting with
step 1.
d) Reconnect the seal wash tubing to the right pump head.
Page 186
Fig. 66: Tubing connection on the seal wash detector
Seal wash tubing
Operating Instructions