RF Capacitance Level Sensor
Provides Maximum Reliability and Stability
Monitor’s TrueCap® Model
MK-2 RF capacitance point level sensor is designed
to provide superior and stable sensitivity threshold
making it suitable for a variety of powder and bulk
solids applications. For ease of use, the Model MK2
has push-button calibration and sensitivity selection
as well as a built-in automatic temperature compensation
circuit that combines with the MK-2’s microcontroller
to provide automatic calibration compensation yielding
the most stable and reliable RF capacitance point
level sensor available today. In addition, the Model
MK-2 provides automatic immunity to material build-up
on the probe by its driven shield design and contains
a universal power supply of 48-240V AC / 24-48V DC.
Monitor offers an unmatched product selection of
RF capacitance sensors for bulk solids, liquids and
slurry applications.
Monitor Technologies LLC is a pioneering supplier of level measurement instrumentation,
solids flow monitors, particle emission monitors and aeration devices for the
worldwide powder and bulk solids markets. The experience and market knowledge
gained over 50 years of business has earned Monitor a reputation for providing
high quality and reliable product solutions. Monitor is located in Elburn
Illinois, give us a call today and let us put our creative solutions to work
for you!
For more information refer to www.monitortech.com or
contact us at 800-766-6486 in the US or 630-365-9403.
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.