36
Maintenance and Care
P 2.1S/P 4.1S user manual V6870, version 3.1
Installing the Pump Head
Device defect
Damage to the pump head caused by overtightened capillary fittings. Note the
torque of the fittings.
Use 5 Nm torque for stainless-steel fittings.
Use 1 Nm torque for PEEK fittings.
Check Valves
Dirty check valves do not open and close properly. They cause pressure fluctua-
tions and irregular flow.
Note:
Insert the valves in the direction of flow!
Process
Figure
1. Unscrew inlet fitting
2
and outlet
fitting
1
.
2. Unscrew the inlet fitting
5
to the
eluent.
3. Unscrew the outlet fitting
4
to the
pressure sensor.
4. Alternately unscrew the 4 fastening
screws
3
.
5. Hold the pump head and consecu-
tively pull out all fastening screws.
Process
Figure
1. Insert the fastening screws
3
and
tighten alternately.
2. Tighten the outlet fitting
4
to the
pressure sensor.
3. Tigthen the inlet fitting
5
to the
eluent.
4. Tighten the inlet fitting
2
and the
outlet fitting
1
of the piston.
2
3
1
4
5
2
3
1
4
5
