Büchi Labortechnik AG
Cleaning and servicing | 8
Operation Manual Sepiatec SFC-250
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8
Cleaning and servicing
NOTE
u
Carry out only the service and cleaning operations described in this section.
u
Do not carry out any servicing and cleaning operations that involve opening the
housing.
u
Use only genuine BUCHI spare parts in order to ensure correct operation and
preserve the warranty.
u
Carry out the service and cleaning operations described in this section to extend
the lifetime of the instrument.
8.1
Pumps
For the pump maintenance please refer to the manufacturer documentation.
8.2
Servicing the injection valves
The Rheodyne injection valves can be opened when they are blocked. If this
happens, it is recommended that the seals and stator be cleaned in an ultrasound
bath using methanol. Seals should be replaced when they are worn. The parts
required are contained in the Rhebuild kit.
8.3
Cleaning the UV detector flow cell
Precondition:
R
The detector baseline starts to get noisy. Possible sample residues are in the flow
cell.
u
Remove the columns.
u
Replace the columns by a stainless steel capillary tube.
u
Rinse the stainless steel capillary tube with CO
2
modifier mixture.
For further instructions please consult the manufacturer’s manual for the Knauer
Detector UVD 2.1S.
8.4
Back pressure regulator valve
Please contact the BUCHI Customer Service if any problems occur with the back
pressure regulator valve.
8.5
Fractionation valve
8.5.1
Cleaning the valve and replacing the rotor
The valve can be cleaned by rinsing through all the channels with a suitable solvent.
If this does not resolve the fault, the valve can be dismantled so that the parts can
be cleaned more thoroughly and checked for damage.
The valves have polished, sealed surfaces which must be protected during
dismantling and cleaning. Work in a clean environment and place the parts on a soft
cloth or clean paper.
