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Febuary 2007 : SiloPatrol® SE


SiloPatro® SE
Cable-Based Sensor System Improves Silo Level Accuracy


Monitor Technologies LLC announces that a leading charcoal manufacturer has used its latest second edition SiloPatrol® SE inventory monitoring system to improve the accuracy and ease of making silo level measurements of charcoal.  

“We used a cable running up the side of the silo through the top and down inside with a weight attached to the end inside the silo. The end on the outside was attached to a hand winch.  We would release the winch, lower the cable until it appeared it had hit the material surface.  Then we would take a reading from a marker on the cable on the outside.”, says the charcoal manufacturer.  The problem that was created was measurement error and inconsistency due to the manual method employed and human error in making this manual measurement.  It was very frequent that they were way off in readings and the measurement of the cable outside the silo was always an “eyeball guess”.  This method was used on measuring wood chip and wood flour levels.

The solution was the SiloPatrol® SE inventory monitoring system from Monitor Technologies.  The SiloPatrol SE uses patent pending state-of-the-art technology and incorporates leading reliable design techniques in electronics, software and mechanics to make reliable inventory measurement in virtually any environment.  This state-of-the-art weight & cable system is a proven problem solver.  Wood chips have a bulk density of about 20-30 lbs/ft3 and wood flour is even lighter at about 15-20 lbs/ft3.  In addition, the dielectric constant was very low, running around 1.7 or lower, making this material very difficult for sonar, radar and other types of level measurement technologies.

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!

For more information refer to or contact Ms. Emily Jones at 1-800-766-6486 (630-365-9403).



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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