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b.
3. Cleaning/replacing the dispensing unit
(Note the design changes from 2012 and from serial number 01K, see Intensive cleaning, p. 78). The
dispensing unit consists of a piston and a dispensing cylinder with a valve block. If liquid is found
above the piston, the piston must be replaced. We always recommend replacing the complete dis-
pensing unit.
a.
a'
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b.
Hold the titrating tube as shown in the figure. To dis-
connect, push the discharge tube housing all the way
up, then pull it forward with gentle up and down mo-
tions (Fig. b).
c.
Clean the titration tube with the integrated discharge
valve (ultrasonic bath) or replace it.
a.
Hold the piston rod and slowly pull the piston out of the
dispensing cylinder (Fig. a).
If it is difficult to move the piston, open the top of the instru-
ment, clamp the assembly tool (teeth pointing downward)
between the dispensing cylinder and the top and turn the
hand wheel to move the piston completely out of the dis-
pensing cylinder (Fig. a').
b.
Use a soft cloth to clean the dispensing cylinder and the
piston, or replace them.
NOTICE
Operating manual
12 Cleaning
77
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