5 Stirring operation
50108213_02.2007
13
Thermo Scientific
5.2 Magnetic stirring bars
Thermo recommends the following magnetic stirring bars:
Type
Size (mm)
Material
Order No.
KOMET 15
KOMET 30
KOMET 50
(Ø x L) 9 x 15
(Ø x L) 12 x 30
(Ø x L) 21 x 50
SmCo
50087924
50087930
50087909
INFORMATION
The length of the magnetic stirring bars must not exceed 80 % of the
vessel diameter. In the case of circular and triangular magnetic
stirring bars, the length must not exceed 50 mm. Do not use
cylindrical stirring bars with a center ring, or elliptical stirring bars
with a round cross-section.
INFORMATION
Some magnetic stirring bars (especially triangular bars) may have a
critical resonance frequency at lower rotation speeds. This may cause
the magnetic stirring bar to wander away from the turning center and
carry out periodic oscillations. Avoid this rotation speed setting when
the problem occurs. Quickly travel through this problem range when
adjusting the rotation speed.
