Metrohm 858 - 4 Operation and Maintenance; General; Injection Valve; Filter

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4 Operation and maintenance
858 Professional Sample Processor
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4 Operation and maintenance
4.1 General
Just like highly sensitive measuring instruments, Sample Processors require
proper care as well. Excess contamination of the instrument may result in
functional disruptions and a reduction in the lifetime of the otherwise
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 power plug) should be protected from
contamination.
4.2 Injection valve
If the injection valve is blocked, then the channels of the valve 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 (38-2) should be replaced every three months and
more frequently with higher backpressure.
1
2
3
Figure 38
Pump tubing connection – Replacing the filter
1
Tubing olive
2
Filter (6.2821.130)
Pack contains 10 pieces.
3
Filter screw
Replacing the filter
1
Unscrewing the filter screw
￭ Unscrew the filter screw from the tubing olive.