BRAND seripettor FEP Operating Manual page 42

Cleaning
Cleaning / replacing valves (cont.)
seripettor pro
®
1.
Filling valve
a) Pull out the filling tube.
b) Use the mounting tool to unscrew the filling valve (fig. 1b).
c) If the sealing ring is contaminated or damaged, carefully
remove it with a pair of curved forceps (fig. 1c).
d) If necessary, clean any contaminated individual parts
(e.g., in an ultrasonic bath).
e) Insert cleaned or new sealing ring.
f) Screw in the cleaned or replacement filling valve, first by
hand, and then tighten it with the mounting tool (fig. 1f).
2.
Discharge valve
The discharge valve is integrated in the discharge tube.
a) Remove the discharge tube and clean it in the ultrasonic bath
if necessary.
b) Mount cleaned or new discharge tube (fig. 2b).
Note:
If the instrument does not fill up, and if some elastic resistance is
evident when the piston is pulled upward, then it is possible that the
ball valve is merely stuck.
In this case, loosen the ball valve using light pressure, for example,
with a 200 µl plastic pipette tip (see fig.).
42
1b
1c
1f
2b