34
Maintenance and Care
P 2.1S/P 4.1S user manual V6870, version 3.1
Maintenance and Care
Proper maintenance of your HPLC device will ensure successful analyses and
reproducible results.
Device defect
Intruding liquids can cause damage to the device.
Place solvent bottles next to the device or in a solvent tray.
Moisten the cleaning cloth only slightly.
All smooth surfaces of the device can be cleaned with a mild, commercially avai-
lable cleaning solution, or with isopropanol.
Users may perform the following maintenance tasks themselves:
Replacing the pump head
Exchanging the check valves
Pump head leaks
Check the following options:
• Inspect the inlet and outlet screw fittings of the
pump head
• Replacing the pump head
• If the pump head seals are defective, solvent enters
the piston backflushing; inform the technical support
of KNAUER.
Flow rate is not cor-
rect
Check the following options:
• Inspect the inlet and outlet screw fittings of the
pump head
• Clean the check valves
• Exchange the check valves
• Replacing the pump head
• Pump without pressure sensor: Pay attention to the
influence of the pressure on the flow rate (will not be
compensated).
• Inform the Technical Support of KNAUER.
Pump will not turn
on
Power cable needs to be connected to power supply
and power adapter has to be turned on.
• Inspect the power cable to ensure that it is plugged
into the power supply.
Problem
Solution
