© 2mag AG
Page 7 of 17
Version: 5.1
2.7 Tips and hints to the topic stirring
The mixing flasks should be filled max. up to the middle (high speed
range) resp. up to ¾ (low speed range).
Place one magnetic stirring bar in each stirring flask.
Place the stirring flasks right in the centre of the stirring point on the
Stirring Hotplate resp. in one borehole of the Stirring Drybath.
In case the magnetic stirring bar turns in an unsteady or jerky
way or bounces:
The interaction between the alternating magnetic field and the magnetic
stirring bar is too high.
Increase the speed or
Use a smaller magnetic stirring bar or
Decrease the stirring power.
In case the magnetic stirring bar will not be centred or leaves the
centre permanently:
The interaction between the alternating magnetic field and the magnetic
stirring bar is too low.
Or the stirring bar has a bottom that is uneven or too thick-walled.
Move the flask slightly back and fro and centre it again onto the stirring
point of the stirrer surface.
Reduce the speed or use a longer magnetic stirring bar or one with a
larger diameter or
Use a smaller flask with a thin-walled, even bottom or
Reduce the filling amount in the flasks or
Increase the stirring speed.
In case the stirring activity is too weak:
Use commercial magnetic stirring bars with SamariumCobalt-core.
Use a longer stirring bar or a stirring flask with smaller diameter.
We recommend using 2mag – ASTEROID stirring
bars to increase the stirring performance.
