May 2011: HMI2 Local
Operator Interface Control Consoler
Operator Interface Control Console for
Continuous Level Sensors
Elburn, IL -- The latest version
of the HMI2 control console provides local operator
interface for Monitor Technologies’ continuous
level sensors. The HMI2 has two RS-485 networks, with
a capacity of 16 sensors each, to support up to 32
Flexar® guided wave radar level sensors and/or
SiloPatrol® SMU SE “smart” cable-based
level sensors. The multi-functional HMI2 controls the
operations for the Flexar and SiloPatrol SMU SE “smart” sensors,
displays measured and calculated data and performs/displays
system and sensor diagnostic messages. Flexar’s
real-time continuous output can now be viewed on the
HMI2 display for immediate level measurement updates.
Another new aspect of the HMI2 is that it contains a built-in strapping table
to produce volumetric or gravimetric calculated readings if the dimensions of
a vessel cannot be determined or the vessel is of an irregular shape. According
to Greg DeRudder, Product Manager at Monitor, “The strapping table is a
great feature for when accuracies of normally calculated volumes and weights
just are not satisfactory to the end user.” Also, the HMI2’s improved
volume & weight calculations can include the additional amount of material
contained in the roof section of storage silos with steep roofs (30 degree angle
for example). The HMI2 combined with the Flexar and/or SiloPatrol can create
practical solutions for many liquids and most powder and bulk solids materials
and process conditions.
Please visit www.monitortech.com, e-mail
firstname.lastname@example.org or call 1-800-601-6204 for more information.
Monitor Technologies LLC is a dependable manufacturer
of level measurement instrumentation, solids flow monitors,
particle emission monitors and aeration devices for
the worldwide powder and bulk solids markets and many
liquid 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.
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 (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.