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November 2007 : SiloPatrol® SE


SiloPatro® SE
Inventory Monitors Saves Time and Increases Concrete Plant Safety


Effective concrete plant operation requires good management of your raw material inventories. Materials like cement, flyash and aggregates are often stored in silos or bins. In such cases it is necessary to check periodically to see how much cement or flyash you have on-hand in order to run continuous and consistent concrete mix. In the past, plant personnel have had to climb to the top of the silos in order to “tape” the empty space distance to determine how much material you have remaining. Not any more….

The SiloPatrol(r) SE smart cable-based sensors are available to perform the task of measuring the inventory level of cement, flyash and aggregate automatically, on-demand and without the need for your operator or plant personnel to climb silos or do much of anything. The smart cabled-base sensors automatically lower a weight & cable sensing mechanism into the silo until it contacts the material surface. Upon contact the weight & cable system is immediately retracted and the measurement is relayed to the plant control system or operator. Electronic sensing mechanisms and sensor software control all functions of the sensor to ensure the proper travel of the weight & cable assembly to ensure accuracy and reliability. These sensors are easy to install and also virtually maintenance free, requiring only a periodic inspection usually once or twice per year. Once the material level measurement is obtained, a variety of operator interface devices is available to calculate and display material volume, weight and %-full information. A PC-base software package is also available that can automate report generation, send emails to suppliers or corporate locations and allow remote viewing of the graphical interface.

The SiloPatrol SE uses the time-proven weight and cable techniques and combines patent-pending technology, a new split-compartment enclosure design, state-of-the-art optics, SMT (surface mount electronic technology) and other valuable features to produce a rugged, reliable and accurate measuring system designed for the harshest and most dynamic conditions. The SiloPatrol SE can help keep your plant running smoothly and increase personnel safety.

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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