Maintenance
Stamolys CA71CODcr
36
Hauser
7.3
Replacing pump hoses
7.3.1
Analyzer
CAUTION
!
Risk of splashing reagents when removing hoses from the hose nozzles
►
Wear protective clothing, gloves and goggles.
The peristaltic pumps used for the analyzer convey the medium in a combination of vacuum and
displacement pump. The pump rate is dependent on the elasticity of the pump hoses. Elasticity
decreases and the pump rate drops as mechanical stress increases. Wear depends on mechanical
stress (measuring interval, pump pressure). The wear effect can be compensated by periodical
calibration. If the hose elasticity becomes too low and the pump rate is no longer reproducible, it is
necessary to replace the hoses.
Removing the old hoses
1.
Remove the reagent hoses from the reagent canisters in order to prevent contamination of the
reagents.
2.
Flush the old hoses with water first and then with air to empty them (see SERVICE).
3.
Remove the hoses from the nipples of the valve block.
4.
Release the hose box(es) (1 to 3 per pump):
– Press against the lower retainer (item 3).
– You can now remove the hose box along with the pump hose.
– Remove the old hose from the box any dispose of it.
– Clean the hose box and the roller head (item 1) with a tissue.
a0001652
Fig. 19: Reagent
pump
1
2
3
4
5
Roller head
Upper retainer of hose box
Lower retainer of hose box
Guide at pump hose
Nipple with guide
1
2
4
5
3
