8
(
Fig 3
)
After the locking knob (D, see
Fig. 1
) on the left side of unit
is pulled, the gears could be taken out of mesh by turning
in counterclockwise direction to the bearing bushing on the
black knurled surface (E, see
Fig. 1
) above the chuck. The
centre axis of the stirring apparatus is thus shifted in a radial
direction. The bearing bushing is then axially positioned up
or down in accordance with the range which is to be set.
The gears are put back into mesh by turning the bearing
bushing back (clockwise) and the centre axis of the agitator
is swiveled into the original position until the locking knob
(D, see
Fig. 1
) catches.
Gear speed change
The rotation speed is adjusted by means of the rotary knob
(B, see
Fig. 1
) on the side of the overhead stirrer.
Speed display
It should be necessary to change the gear speed in the
course of setting up an experiment or process with glass
apparatus, then attention must be paid to the movement of
the stirrer element by the eccentric bearing bush and to the
movement in the axial direction. If this is unacceptable, the
stirrer element must be loosened in the chuck.
Only change the gear posi-
tion at standstill!
Output shaft
The clamping chuck and output shaft permit clamping
IKA
®
recommend stirrer tools (see “
Permitted IKA
®
Stirrer
tools
“ section).
The output shaft is designed as a hollow shaft, and the
opening on the top side of the housing is closed with a
stirrer cover. When the stirrer cover is opened, it is possible
for stirring shaft to be pushed out over the top edge of the
housing at
standstill
, e.g. during changing container.
For safety reason, the stirrer cover must be pushed back
into the opening of the housing so that it is properly closed.
This is the only way to ensure that working with the unit is
safe and that media cannot enter the instrument.
Please see section “Safety in-
structions“!
Accessories must be assembled according to the following
assembly instructions (
Fig. 4
to
Fig. 8
).
If above conditions are met, the in-
strument is ready for operation after
plugging in the mains plug.
Commissioning
Assemble the overhead stirrer and all necessary accessories
on a stable, even, non-slip surface. The
RW 28 digital
overhead stirrer must be secured to a stable stand (e.g.
R
2722
or
R 2723
) with a cross-sleeve (e.g.
R 271
). The stir-
ring vessel must always be securely fixed for safety reasons.
You must also ensure that the mounting device (stand) is set
up in such a way that it is not liable to topple and does not
start to move during the stirring procedure.
NOTICE
DANGER
The rotational speed is displayed directly in revolutions per
minute (rpm) on the display (C, see
Fig. 1
).
