RF Capacitance point Level Sensor
Use Temperature Sensor and Microcontroller
Elburn, IL - The TrueCap® Model
MK-2 RF Capacitance Point Level Sensor from Monitor
Technologies has been redesigned. In addition to the
reliable attributes associated with the TrueCap line,
the Model MK-2 boasts exciting features that make it
optimal for point level applications. Value added
to your use of the unit includes the elimination of
recalibrating sensors and false indication of material
presence/absence.
Unlike other sensors, the new MK-2 uses a temperature sensor to detect changing
ambient temperatures to adjust its calibration automatically so that the unit
provides the highest degree of calibration stability. This, in combination
with a superior technical electronic design using industrial and mil-spec grade
components, means that you get true readings with long term reliability. In
addition, the unit features a universal power supply (48-240VAC or 24-48 VDC),
new housing with a twist on/off cover, local visual indication and dual conduit
entrances for easier wiring access.
In addition, the TrueCap Model MK-2 is available with both Class I and II Hazardous
location approvals allowing one model to serve virtually any application. For
ordinary locations, the MK-2 has the CE Mark.
Monitor Technologies LLC is a leading supplier of level, flow, particle emission
and aeration instrumentation for the worldwide powder and bulk solids market.
The experience and market knowledge gained over five decades 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 Ms. Emily
Jones at 1-800-766-6486 (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.
