Thermo Scientific EASY-nLC 1200 Troubleshooting And Maintenance Manual page 96

5
Routine Maintenance
Maintaining the Syringe Pumps
74 Troubleshooting & Maintenance Guide
5. Remove the used piston seal as follows:
a. Remove the stainless steel Viper solvent line connected to the pump head
It is also recommended to disconnect the tubing from the pressure sensor. This
prevents damage, because it does not have to be bent out of the way.
Figure 54. Stainless steel fitting connected to the pump head (PLU model pump)
b. Using a 3 mm L-hex wrench, remove the two screws that secure the pump head to
the pump body (Figure
IMPORTANT Do not move the piston if the pump head has been removed.
Doing so can affect the piston alignment, which might cause the piston
calibration to be lost and result in irreversible piston damage.
Figure 55. Using a 3 mm L-hex wrench to remove the pump head
Two screws that secure
the pump head to the pump body
c. Clean the exposed portion of the piston with a lint-free tissue soaked in
UHPLC/MS-grade methanol and visually inspect the piston for scratches. Ensure
that no solvent runs into the pump.
55).
(Figure
Stainless steel Viper solvent line
Stainless steel Viper solvent line
that connects the pump to the
pressure sensor
Thermo Scientific
54).