5 Stirring operation
Thermo Scientific
14
50108213_02.2007
Thermo has developed a new magnetic stirring bar KOMET (Figure 4). It contains a
high-quality super-strong samarium-cobalt magnet. KOMET shows a strong magnetic
force. The stronger attraction to the magnetic alternating field provides the stirring bar
with very efficient stirring properties. Even if there are greater distances (e.g. in high
measuring cylinders) the stirring force will be maintained. The stability of the stirring
bar will not be impaired if the vessel has a curved bottom. The strong magnetic
coupling in samarium-cobalt magnets will also increase friction. The standard design
of the KOMET magnetic stirring bar is therefore unsuitable for stirring liquids
containing particulate matter (such as mud) or for stirring in vessels with a rough
interior surface. Some of the KOMET stirring bars are specially fitted with a wear-
resitant glide ring for use under excruciating circumstances, such as when stirring
vessels feature rough plastic or stainless-steel bottoms or if the media to be stirred
contain solids (Figure 5).
Any risk of demagnetization by external magnetic fields is completely eliminated. All
KOMET series stirring bars can be readily recognized by their two conical ends.
Figure 5:
KOMET stirring bar
Side view (left) and cross-section through central portion (right)
Figure 6:
KOMET stirring bar with glide ring
