Servicing - VWR VP 820 Manual Del Usuario

8.

Servicing

8.1 Servicing Schedule
Component
Pump
Diaphragm and valve plates/sealings
Tab. 7
8.2 Cleaning
When cleaning, make sure that no liquids enter the inside of the housing.
8.2.1 Flushing Pump
 Before switching off the pump, flush it with air (if neccesary for safety reasons: with an inert gas) for
about five minutes under atmospheric conditions (ambient pressure).
8.2.2 Cleaning Pump
 Only use solvents for cleaning if the head materials cannot be attacked (check the resistance of the
material!).
 If compressed air is available, blow out the components.
8.3 Changing Diaphragm and Valve Plates/Sealings
Conditions
 Pump is switched off and mains plug is removed from the socket
 Pump is clean and free of hazardous materials
 Tubes removed from pump's pneumatic inlet and outlet
Spare part/tool
Spare part/tool
Service Set (according to chapter 10)
Philips-head screwdriver No. 2
Felt-tip pen
Tab. 8
Information on procedure
 Always replace diaphragm and valve plates/sealings together to maintain the pump performance.
With multi-head pumps, parts of the individual pump heads can be confused.
 Replace the diaphragm and valve plates/sealings of the individual pump heads consecutively.
Health hazard due to dangerous substances in the pump!
Depending on the substance transferred, caustic burns or poisoning are possible.
 Wear protective clothing if necessary, e.g. protective gloves.
 Flush pump before replacing the diaphragm and valve plates/sealings (see chapter 8.2.1).
WARNING
Removing pump head
1. On the pneumatic head connection (3), loosen the union nuts (2) by
hand. Then slightly loosen the angle-fitting (1) in the pump head (4)
by turning it anticlockwise, so that the connecting tube can be pulled
out.
2. Mark the position of top plate (fig. 9/5), head plate (fig. 9/6),
intermediate plate (fig. 9/8) and adapter relatively to each other by a
drawing line (for two-headed pumps: at both pump heads) with a felt-
tip pen. This helps to avoid incorrect assembly later.
3. Loosen the outer screws (fig. 6/5) on the pump head/pump heads.
Servicing interval
Regular inspection for external damage or leaks
Replace at the latest, when pump output decreases
English
Fig. 6: Removing pump head
11