VWR Bottle Top Dispenser Manual De Instrucciones página 8

The dispenser can be turned on the flask and fixed in any direction by
using the built-in FIX adapter.
To fill the dispenser the first time lift and lower piston
a short distance several times until no air bubbles are
seen in the cylinder.
Volume setting
Loosen the nut of the volume setting system, set the
desired volume. The upper edge of the fine adjustment
screw shows the volume set. Fix the screw.
For calibrating purposes turn the screw of the fine ad-
justment. Turn downwards to increase the volume, turn
upwards to decrease the volume.
Warning:
!
If the stopper cap is not removed when dispensing,
there may be an over-pressure in the channel system
and uncontrolled dispensing may be the conse-
quence.
Dispensing procedure
a) For safety make sure that the discharge tube does not point at the user
or any other person. By using the built-in FIX adapter it is possible to fit
the dispenser accordingly. Remove stopper cap by holding the discharge
tube tight with other hand.
b) Set the desired volume with the volume setting system.
c) Lift the dispensing piston up with the finger guard. Do not touch the
piston itself to avoid contact with chemicals. The piston stops at the volume
set. The graduation on the glass cylinder is an additional optical control of
the volume set or air-bubbles.
d) To dispense the liquid push the piston down.
e) Avoid uneven piston movements or hard pushes against the
stopper ring.
f) Replace stopper cap after the dispensing procedure by holding the
discharge tube tight with other hand.
Warning:
!
The piston must be pushed down manually. Therefore chemicals
may remain in the dispensing cylinder after dispensing. To avoid
unintentional dispensing, always dispense the total volume set. The
stopper cap must be placed on the discharge tube after every use.
When dispensing observe safety precautions!
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