7 Troubleshooting
50108213_02.2007
19
Thermo Scientific
7 Troubleshooting
Rotation of the magnetic stirring bar is always irregular:
It is unavoidable that magnetic stirring bars will age with time, for example
through sterilization, use at excessive temperatures, or mechanical stress (such
as when you drop it). This may adversely affect the magnetic properties of the
stirring bar.
CAUTION
Do not allow AlNiCo5 type magnetic stirring bars to remain in an
alternating magnetic field if they cannot rotate freely. Do not subject
the magnetic stirring bar to a strong inverse magnetic field. This may
result in destruction of the magnetic stirring bar.
Remove and replace the magnetic stirring bar with a new one.
Or:
Use the KOMET series of super-strong magnetic stirring bars offered by
Thermo (see chapter 5.2). They are made from high performance
Samarium-Cobalt magnets. Any risk of demagnetization by external magnetic
fields is completely eliminated.
The magnetic stirrer (5) fails to operate:
Check to see whether the power supply unit (9) is delivering voltage.
The power supply unit (9) is fitted with a temperature controlled safety system which
will switch off the power supply unit (9) permanently in an overload situation.
