Metrohm 858 Professional Sample Processor - Manual (Page 49)

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 4 Handling and maintenance
858 Professional Sample Processor ￭￭￭￭￭￭￭￭ 41
4 Handling and maintenance
4.1 General
It is not only highly sensitive measuring instruments but also sample pro-
cessors that require proper care. Excess contamination of the instrument
may result in functional disruptions and a reduction in the service life of
the sturdy mechanics and electronics of the instrument.
Severe contamination can also have an influence on the measured results.
Regular cleaning of exposed parts can prevent this to a large extent.
Spilled chemicals and solvents must be removed immediately. In particular,
the connector strip (especially the mains plug) should be protected from
contamination.
4.2 Injection valve
If the injection valve is blocked, then the channels of the valves can be
rinsed with water in the opposite direction. If this is not successful, then
the injection valve must be cleaned by a Metrohm service technician.
4.3 Filter
The 6.2821.130 filters (40-2) should be changed every 3 months, more
frequently at higher backpressure.
1 2 3
Figure 40 Pump tubing connection – Changing the filter
1 Tubing olive 2 Filter (6.2821.130)
Packaging contains 10 items.
3 Filter screw
Changing the filter
1 Unscrew the filter screw
￭ Unscrew the filter screw out of the tubing olive.