Elburn,
IL - Monitor Technologies’ line
of rotary paddle bin monitors are reliable, rugged and
economical. They provide point level control for detection
of dry bulk materials in a wide variety of applications.
Monitor’s paddle units can be used to eliminate
bin overflow, maintain a predetermined material level,
indicate plugging of conveyors and pneumatic lines or
provide any of a number of level control functions
Unlike
many other available paddle units, Monitor’s rotary
paddle level indicators incorporate a feature that automatically
shuts off the motor of the unit when the paddle is in a
stalled position, which both extends the life of the motor
and minimizes maintenance. Monitor’s paddle units
also have a built-in slip clutch to protect motor and drive
gears from excessive forces and longer-lasting sealed bearings.
Additionally, the paddle units’ new housing features
a twist-on/off cover, 2 conduit entrances and is available
with NEMA 4 and an explosion-proof ratings.
Because
different material densities, particle sizes and flow characteristics
require specific paddles for optimum performance, Monitor
Technologies offers a variety of interchangeable paddle
assemblies to fit most bulk solid application needs. Additionally,
Monitor offers a high-temperature unit and an assortment
of process connections and accessories.
Elburn,
IL - Utilizing excellent sensitivity
and a non-intrusive housing design, Monitor Technologies’ Solids
Flow Detector (SFD-2) and Solids Flow Indicator (SFI) provide
a signal indicating the flow/no-flow condition of solids
and powders in gravity chutes, feeders and pneumatic pipelines.
The
SFD-2 and SFI use low-power microwaves to sense motion. Microwaves
are virtually unaffected by heat, humidity, ambient light,
pressure, vacuum, high or low temperatures, or dust. This
gives the SFD-2 and SFI with maximum effectiveness in industrial
applications. Both units also carry Hazardous Location Approvals.
The
non-contact/non-intrusive design ensures long-term reliability
and elimination of process contamination. Intrusive probes
might wear out, break off or inhibit material flow. The ability
to sense through most non-metallic surfaces allows the SFD-2
and SFI to have a non-intrusive flush mounting.
The
selection of either SFD-2 or the SFI is based upon the type
of output required (relay or analog). With convenient remote
electronics, the SFD-2 provides relay outputs. The SFI has
a variable analog signal relative to the magnitude of flow.
This provides more information for the user than the “on-off” flow
detection of the SFD-2.
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.
