8
(
Fig 3
)
The gears could be taken out of mesh by turning in counter-
clockwise direction to the bearing bushing on the black knurled
surface (
E
, see
Fig. 1
) above the chuck. The centre axis of
the stirring device is thus shifted in a radial direction. The
bearing bushing is then axially positioned up or down in ac-
cordance with the range which is to be set. The gears are put
back into mesh by turning the bearing bushing back (clock-
wise) and the centre axis of the agitator is swiveled into the
original position until the bearing bush engages again.
Gear speed change
The rotation speed is adjusted by means of the rotary knob (
B
, see
Fig. 1
) of the overhead stirrer.
The rotational speed is displayed directly in revolutions per minute (rpm) on the display (
C
, see
Fig. 1
).
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 position
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 20 digital
over-
head stirrer must be secured to a stable stand with a cross-
sleeve. The stirring vessel must always be securely fixed for
safety reasons. You must also ensure that the mounting de-
vice (stand) is set up in such a way that it is not liable to top-
ple and does not start to move during the stirring procedure.
Securing the stirrer to the stand
Diagram
(see Fig. 4)
Attach the cross sleeve (
H
) to the upright of the stand (
I
).
Attach the extension arm (
J
) to the side of the cross sleeve
not in use, with the opening facing upwards.
Tighten both clamping bolts (
G
) firmly once the desired po-
sition for the stirring procedure has been adjusted correctly.
Check that the stirrer is held in position firmly prior to each use
and also at regular intervals. The position of the stirrer must
only be adjusted when the equipment is stationary and the
power supply is disconnected.
Securing
Securing a stirring element using the chuck
Remove the chuck key from
the chuck before turning on
the device.
Diagram
(see Fig. 5)
Slide the stirring tool (
M
) into the chuck (
L
). Tighten the chuck
firmly using the chuck key (
K
).
The stirring tool must only be changed when the equipment is
stationary and the power supply is disconnected.
WARNING
NOTICE
WARNING
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