The Model SFI and SFD-2 line of solids flow detectors
provide analog or relay outputs to indicate the flow
/ no-flow condition of powder and bulk solids materials
in chutes and pneumatic conveying lines. Using
microwave Doppler radar technology these units are
non-invasive and extremely reliable and rugged to withstand
the rigors of the installation and your process extremes.
Solids Flow Monitors like the Model SFI and SFD-2 can be used in a wide variety
of applications. One customer uses the analog signal from a Model SFI unit
to monitor the flow of carbon black in toner cartridge manufacturing to ensure
positive flow before further processing and to detect no-flow and possible plugged
conditions. Another uses the Model SFD-2 solids flow detector to monitor
the flow of coal into the burner of a coal-fired power plant to detect no-flow
conditions and ensure safety. These two applications illustrate the potential
for use in improving your process efficiency and maintaining process safety.
The Model SFI and SFD-2 solids flow monitors are brought to you by Monitor Technologies
LLC. Monitor Technologies has pioneered level measurement for powders and
bulk solids for five decades. The experience and market knowledge gained 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!
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.