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January 2010: HMI2 Operator Interface Control Console
Monitor Introduces Latest Generation Operator Interface For The Silo Patrol®

HMI2 Operator Interface for Silo Patrol

Monitor Technologies, LLC is proud to announce the new HMI2 which is the latest generation in operator interface for the SiloPatrol® SE cable-based “smart” sensor inventory management system. The optional HMI2 features two sensor networks that provide operator interface for up to 32 SiloPatrol level sensors. The HMI2 also contains a universal AC power supply that supports an input voltage of 100-240V AC.
The multi-functional HMI2 controls the SiloPatrol® SE SMU “smart” sensors, displays measured and calculated data and performs/displays system and sensor diagnostic messages. The HMI2 can be programmed to operate the SMU sensors manually, automatically or allow for both.
The display is back-lit for visibility in low-light conditions and can show data in English or Metric units including feet, meters, pounds, kilograms, cubic feet, cubic meters, U.S./British bushels, gallons, liters, tons, and metric tonnes.
The combination of the HMI2 and the SiloPatrol® SE cable-based bin level sensor provides an intuitive and versatile inventory management system for a variety of bulk solid, powder, pellet, granular, slurry, and some liquid applications.  Additionally, when needed, auxiliary relay and/or analog outputs can be incorporated into the system by using the optional Auxiliary Output Enclosure (AOE). 

For more information please visit:


Monitor Technologies LLC, located in Elburn, Illinois, is a leading manufacturer of level measurement instrumentation, solids flow indicators, particle emission monitors and aeration devices for the worldwide powder and bulk solids markets. The experience and market knowledge gained over 50 years of business has earned Monitor a reputation for providing high quality and reliable product solutions backed with trusted customer service. For more information please visit



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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