Level Measurement & Control


Capacitance level switch for solid applications

February 2013 Level Measurement & Control

Finetek offers a range of instruments that can be used in the measurement of solids levels in various industries, and is especially suited to silos holding solids and powders. The measuring principle of the SA Series capacitance level switch is based on capacitance effects. When the switch is set in a silo, it forms a condenser between the detector electrode and the silo wall. The capacitance of the condenser varies in proportion to the change of the material specific inductivity (DK value) of the material stored in the silo.

When the level of the material increases within the silo, the capacitance value is increased, and the interior circuit’s resonant signal becomes greater in amplitude. The signal amplitude can be higher or lower than the factory default threshold value, thus causing the relay device to become energised. There are no moving parts within the instrument, therefore it cannot be affected by friction. This makes it suitable for both solid and liquid applications. There are a variety of models available for different applications.



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