6 Stirring operation
Thermo Scientific
22
50108226_02.2007
6.3.7 Selecting the startup time
Cf. Table 4, Startup time menu.
If you intend to stir large quantities of liquid or highly viscous media, it may be
necessary to slowly accelerate the stirring bar to the selected speed. To do so, you may
adjust the soft-start feature to double or quadruple the startup time.
Select the Startup time menu.
Select the desired startup time (1x, 2x, 4x).
6.3.8 Terminating the stirring process
Turn off the stirrer using the START/STOP key (11).
The control unit (5) switches now to standby.
In order to switch it off completely, you have to pull the mains plug.
6.4 Tips on stirring
If rotation of the magnetic stirring bar is uneven or jerky:
Reaction between the alternating magnetic field and the magnetic stirring bar is
too strong.
Increase the rotation speed, or
Use a smaller magnetic stirring bar, or
Increase the gap between the vessel and the stirring drive (2).
You can do this by placing a glass plate or a nonmagnetic metal plate between
vessel and stirring drive (2), or
Reduce the stirring power of the TELEMODUL 20 C / 40 C.
If the magnetic stirring bar cannot be centered, or constantly wanders off
center:
Reaction between the alternating magnetic field and the magnetic stirring bar is
too weak, or the base of the stirring vessel is concave or too thick.
Move the stirring vessel a little back and forth and recenter it on the stirring
point (1).
Reduce the rotation speed, or
Use a longer magnetic stirring bar or one with a larger diameter (e.g. the
elliptical or SmCo magnetic stirring bar), or
Use a smaller stirring vessel with a thin-walled, flat base, or
Reduce the filling level in the stirring vessel, or
Increase the stirring power of the TELEMODUL 20 C / 40 C.
If the stirring action is too weak:
Use the magnetic stirring bar KOMET.
Use a longer magnetic stirring bar or one with a larger diameter, or a stirring
vessel of smaller diameter.
