KM 251 en Maintenance
V1.0 39
9 Maintenance
9.1 General Notes
!
Warning
When dosing dangerous media, observe the corresponding safety precautions!
When working on the dosing head, connections or lines: Wear the necessary pro-
tective clothing (goggles, gloves)!
Do not open the pump!
Repairs must only be carried out by authorised and qualified personnel!
Switch off the pump and disconnect it from the mains before carrying out mainte-
nance work and repairs!
Before removing the dosing head, valves and media lines, empty any remaining
medium in the dosing head into a driptray by carefully unscrewing the suction
valve.
Caution
Observe flow direction (arrow) of valves!
Tighten plastic valves by hand only. Risk of damage!
9.2 Diaphragm breakage control for diaphragm breakage signal
If a diaphragm breakage signal (MBS) occurs, you should first of all check whether an
error has been displayed, as different external factors such as for instance, the heating of
hydraulic or dosing medium can cause the cracked medium to be displaced into the valve,
thereby causing an error to occur. Checks after an MBS:
1. Briefly open the MBS deaeration screw (2u) and then close it again.
2. Switch on the pump
3. If an MBS reoccurs after a short period of time, then a diaphragm has broken.
Caution
After a diaphragm breakage, replace the diaphragms and clean the check-back
valve, see section on “Replacing the diaphragm for dosing head with double dia-
phragm”.
9.3 Intervals for cleaning and maintenance
Check the oil level and add oil if necessary.
• Check the oil level every 2 weeks and add oil if necessary.
S Contact manometer
T Ball check
U Connection piece
1u Filling screw
2u Deaeration screw
T
U
2u
S
1u
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