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Spotlight: RF Capacitance Level Sensor
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TrueCap® MK-2
Advanced RF Capacitance Level Probe |
The TrueCap® Model MK-2
RF Capacitance point level probe is designed to provide a superior
and stable sensitivity threshold making it suitable for a variety
of powder / bulk solids and some liquid or slurry applications.
Advanced features of the Model MK-2 include:
> Automatic immunity to material build-up on
the probe by its driven shield design
> Push-button calibration
> Enhanced temperature compensation
> Maximized reliability via smart sensing algorithms
like “self-validating” fail-safe protection
> Visible status LED on ordinary location units
> Versatility through a variety of configuration
options including: hazardous location version, split architecture
design, quick-connect process connection, stub probe, cable extensions,
solid extensions, Nylon® probes, Ryton® - equiv. probes,
etc.
A practical application for the TrueCap would be to use this level sensor where
a residual material build-up on a different sensor would cause a false material
level indication.
Principle of Operation for the TrueCap RF Capacitance Level
Probe:
The vessel wall and the active probe element establish an impedance reference
between each other when exposed to air which has a dielectric constant of 1.
When materials with a dielectric constant greater than 1 are in close proximity
to the probe, the impedance of the sensing field between the sensor and the vessel
wall will change. Once the amount of change exceeds a threshold that was electronically
determined during the calibration process, an output relay will either be energized
or de-energized depending upon the position of the fail-safe selector on the
probe’s electronic circuit board. A change of as little as .5 pico-farad
is all that is necessary for the probe to sense the presence of material.
Click
here for more information on the TrueCap MK-2 Level Sensor or
contact Monitor Technologies LLC at
Tel.: 800-766-6486 in the USA and
Tel.: 630-365-9403 worldwide.
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SITUATION:
HMI that operators and users read data
from. The lightweight nature of the material was no problem
and the low dielectric constant has no effect on the performance
of this smart cable-based sensor system. The SiloPatrol system
eliminated the manual measurement process, the time taken to make
the manual measurements, improved accuracy of measurement and overall
reliability. The charcoal manufacturer realized savings in
time and material. The system has been in use successfully
for the past four years.