Ask Dr. Level
HiTECH Capacitance level
measure level based on changes in the electrical capacitance between the
sensing element, referred to as the "probe" and earth ground.
The technology is applicable for both conductive and insulating materials, however,
careful application considerations to both
the equipment selected and the mounting configuration are required.
Principle of operation
Electrode, product and vessel
wall form an electrical capacitor.
The capacitance is
particularly influenced by three factors:
- distance of the electrode
- size of the electrode
- dielectric value of
material between the electrodes
continuous level measurement, the product level is continuously monitored
and converted into a level-proportional signal which is either indicated
directly or further processed.
The signal can be
processed in two different ways: either via a signal conditioning
instrument or via a compact sensor that outputs the signal directly as a 4
20 mA signal.
level switches from HiTECH output an two-wire ON-OFF 4 - 20 mA current
signal when a certain level is reached, e.g. maximum or minimum
These levels are
detected at fixed position and are converted into a switching command,
that can be triggered when the probe is covered or un-covered.