Powered Rotary Paddle Level Sensors Use
Long-Life AC Motor
Elburn, IL USA – Monitor
KA and KAX rotary paddle bin level indicators,
powered by 12 or 24 VDC, incorporate an AC motor that
makes them a viable solution for process oriented systems
requiring a low voltage power source, minimal installation
cost, and frequent level cycling. This DC version of
Monitor’s rotary paddle level sensor includes
electronics that converts the 12/24 VDC power source
to 6 VAC energy that is used to operate a 6 VAC motor.
Using an AC motor instead of a DC motor significantly
improves the performance of these models by insuring
functional reliability and providing longer operational
life than a DC motor.
Monitor’s rotary paddle level switches are very versatile and can be used
in a variety of powder & bulk solids storage applications. Other features
include rugged construction, twist On/Off cover, motor shut-off when paddle becomes
impeded and a Hazardous Location option (Model KAX).
The same benefits also apply to the
24 VDC powered SafePoint® fail-safe
rotary paddle level sensor.
About Monitor Monitor Technologies LLC is a leading
supplier of level measurement instrumentation,
solids flow indicators, 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 backed by
trusted customer service. Monitor is located in
Elburn, Illinois USA. For more information
please refer to www.monitortech.com or contact
Mr. Greg DeRudder or Mr. Chris Otte of Monitor
Technologies at 1-800-766-6486 (1-630-365-9403).
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,
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
Principle of Operation for the TrueCap RF Capacitance Level
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.