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 several exciting new features.
redesign gave the MK-2 a new look. The new housing features
a twist on/off cover, local visual indication and dual
conduit entrances for easier wiring access.
the new universal power supply, the MK-2 has the ability
to accept either AC and DC voltages ranging from 48-240
VAC or 24-48 VDC.
before, the Model MK-2 incorporates several features to
make it one of the most reliable point level sensors in
the market. Some of these features include high sensitivity,
automatic build-up immunity, pushbutton calibration and
automatic temperature compensation.
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
IL - The SiloPatrol® Inventory
Monitoring System is the first truly robust cable-based
smart sensor system. It is a field-proven approach to reliably
monitoring the level of material in bins, silos and tanks
up to 150 ft (45.7 m) in height. Setting SiloPatrol apart
from the competition is the durable sensor, variety of
operator interfaces and optional accessories.
heart of any inventory monitoring system is the sensor itself.
The Silo Monitoring Unit (SMU) sensor requires no field adjustments
and provides virtually maintenance-free operation. The SMU
is suited for most any application and can be equipped with
various mounting flanges and plumb bobs.
The SiloPatrol system
also offers the most sensor interface choices. A multi-functional
Human Machine Interface (HMI) connects with the SMU and incorporates
a robust electronic design. SiloTrack™ PC-based
Inventory Management Software provides a flexible graphical
interface for up to 128 “smart” output sensors. SiloTrack is
network capable and provides remote inventory management
options. Also available is an ActiveX® software package
that simplifies the integration of the “smart” output
SMUs into an existing PLC/PC control system.
accessories for the SiloPatrol system
include an affordable Wireless Sensor Interface, Auxiliary
Output Enclosures (AOE) with relay and analog outputs and
a Remote Display Unit.
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.