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5 Operation
2. Dispensing
a.
c.
5.2 Dispensing with the flexible discharge tube
The flexible discharge tube can optionally be used for serial dispensing (see Accessories/spare
parts, p. 79). The specified accuracy and coefficient of variation of the instrument are only obtained
for volumes > 2 ml and by gently approaching the upper and lower stops. The coil of the tubing can be
stretched to a maximum length of 800 mm. The tubing should lie neatly in loops and must not be
twisted.
The parts which come into contact with media consist of borosilicate glass, Al
PTFE, platinum-iridium and PP.
Never use the flexible discharge tube for:
•
Liquids attacking borosilicate glass (e.g., hydrofluoric acid)
•
Peroxides, as these are decomposed catalytically by platinum-iridium (e.g., H
62
Operating manual
a.
Hold the discharge tube and remove the closure cap/
screw cap.
b.
Hold the discharge tube orifice on the inner wall of a
suitable receiving vessel.
c.
Push the piston down to the lower stop evenly and with
minimal effort and then let it move up slowly.
d.
Wipe off the discharge tube against the inner wall of the
receiving vessel.
e.
Seal the dispensing tube with the closure cap/screw
cap.
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2
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