Thermo Scientific EASY-nLC 1200 Troubleshooting And Maintenance Manual page 212

7
Troubleshooting
Troubleshooting the Results of the System Leak Test
Figure 151. Solvent path between valve S and valve W
190 EASY-nLC 1200 Troubleshooting & Maintenance Guide
Figure 151 shows the path between valves S and W
❖ To locate and remedy a leak in valve S or valve W or in the solvent path between
these valves
1. Tighten the test union connections as follows:
i. Remove the nanoViper fittings from the leak test union.
ii. Reinsert the nanoViper fittings into the stainless steel union. Then, slowly
tighten the fittings until you feel resistance
iii. Tighten both fittings by an additional 45 degrees (1/8-turn). Do not tighten the
fittings by more than 90 degrees (1/4-turn).
For more information, see
page 83.
Note Incorrectly tightened fittings in the leak test union is one of the most common
causes for initial failure of the system leak test.
2. To leak test the connections to the test union, do the following:
a. Set up and start the Analytical Column Equilibration script as follows:
i. On the Maintenance > Scripts page, select Prepare in the Category list and then
Analytical Col Equilibration in the Name list.
ii. Press the Parameters tab.
iii. In the Volume [µL] box, enter 140. This volume should be sufficient to keep the
solvent flow on during this troubleshooting procedure.
iv. Leave the Flow box [µL/min] box empty so that pump A operates at the set
pressure.
v. In the Max Pressure [bar] box, enter 1180 bar
vi. Press Start.
Column Out
line
Waste In
line
Leak test union
"Replacing Viper/nanoViper solvent lines"
Viper blind plug
connected
to port 1
(Figure 151).
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