Servicing; Servicing Schedule - VWR VP 820 Manuel D'instructions

 Switch on pump with mains switch (see fig. 2)
Switching off the pump/removing from operation
 When transferring aggressive media, flush the pump prior to switch-off to increase the service life of the
diaphragm (see chapter 8.2.1).
 Switch off pump with mains switch (see fig. 2).
 Open pressure and suction lines to normal atmospheric pressure.
 Disconnect the power source.
8.

Servicing

8.1

Servicing Schedule

Component
Pump
Diaphragm and valve plates/sealings
Tab. 5
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 clean pump with a damp cloth and non-flammable cleaning agents.
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
Soft pencil
Tab. 6
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.
WARNING
 Flush pump before replacing the diaphragm and valve plates/sealings (see chapter 8.2.1).
Servicing interval
Regular inspection for external damage or leaks
Replace at the latest, when pump output decreases
English
9