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July 2003: SiloPatrol® • Evasser


SiloPatrol Family
Reliable Continuous Level Monitoring

Elburn, 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.

The 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.

Optional 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.

Evasser Promotes Material Flow

Elburn, IL - Without the noise and damaging vibration caused by pneumatic or electric vibrators, Monitor's Evasser bin aerator promotes the flow of dry bulk powders from a storage vessel. The compact, low-cost Evasser requires virtually no maintenance and has an effective radius of 12 inches.

Several configurations are available to fit the Evasser to most bulk powders and granular solids applications. The Evasser itself can be provided in either cast iron or 316 stainless steel construction. While normally supplied with a black Neoprene boot, a FDA approved white Neoprene boot is also available. For high pressure or high temperature applications where the boot is not acceptable, a sintered metal insert can be provided. In addition, each of these configurations is available with or without an external mounting plate.

Some typical applications for the Evasser include cement, carbon black and flour.

Spotlight: RF Capacitance Level Sensor
TrueCap Level SensorsTrueCap Light  
TrueCap® MK-2
Advanced RF Capacitance Level Probe

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.

Click here for more information on the TrueCap MK-2 Level Sensor or contact Monitor Technologies LLC at
Tel.: 800-766-6486 in the USA and
Tel.: 630-365-9403 worldwide.


>>Download TrueCap Product Bulletin #413

>>Click here to learn more about other Point Level Switches from Monitor Technologies


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