Microwave Non-Contact/Non-Invasive
Solids Flow Detector Indicates Material Flow Problems
Elburn, IL -- The Model SFD-2 and
SFI solids flow detectors use microwave technology
to detect the flow and no-flow condition of powders
and bulk solids as they discharge from bins and silos. The
SFD-2 and SFI can be used in in chutes, pipes and other
conduits that these materials may flow through. The
sensor transmits microwave energy into a flow conduit
and detects the material flow as the energy is reflected
off the material. The transceiver detects a Doppler
shift in the microwave indicate material movement or
flow.
Both units are easily installed and setup. The use of microwave technology
means that the transceiver can be mounted so that it is non-invasive into the
flow stream and even non-contact if mounted on the outside of a non-metallic
window or pipe/chute. The Model SFD-2 provides relay contact closures in
response to change sin flow and no-flow conditions. The Model SFI provides
an analog output. When the SFD/SFI output is monitored, material stoppage
(flow to no-flow) can be detected and flow-aid devices, such as aerators, vibrators
or air cannons, can be initiated.
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!
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.