Directed Electronics Automate 210D Instrucciones de operaciones descargar pdf (Pagina 21)

Weighing Magnetic or Magnetizable Samples

It is technically impossible to avoid the use

of magnetizable materials in the manufacture

of balances. Ultimately, the operating principle

of high-resolution balances is based

on electromagnetic force compensation of the load

placed on the weighing pan.

When magnetic or magnetizable samples

or containers (e.g., beaker with a stirrer) are weighed,

interactions among the above-mentioned

components of the balance may occur, distorting

weight readouts.

Unlike deviations caused by electrostatic charges,

magnetic interference is usually constant over

time. However, it is sensitive to and depends on the

position of the sample or container on the

weighing pan and is also characterized by poor

reproducibility.

To reduce the effect described above, we recommend

increasing the distance between the sample and

the weighing pan by using a non-magnetizable

material (the reduction in force is proportional to the

quadrate of the distance). In special cases,

soft-magnetic plates should be used to shield against

interfering magnetic effects.

In the presence of extremely strong magnetic fields –

for instance, when measuring the susceptibility

of a sample in an electromagnet – you should use

the below-balance weighing port which comes

standard on your balance.

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Directed Electronics Automate 210D Instrucciones de operaciones Pagina 21