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October 2004: VibraRod™ • SiloPatrol®


Vibratory Point Level Sensor is
Universal for Bulk Solids!

Elburn, IL. —VibraRod® vibrating point level sensor is a universal solution for dry, free-flowing powders and bulk solids having a density greater than 3.12 lb/ft3 (50 kg/m3) and a maximum particle size of 3/8 in. (10 mm). The VibraRod is easy to install, plug-in-place, requires no calibration and is not affected by changing process conditions or material composition.

The single vibrating probe design makes the sensor universal in application by eliminating the material bridging and build-up problems associated with dual prong “tuning fork” devices.

VibraRod level sensors provide a universal power supply, which can be either a low or high voltage design. The high voltage option accepts 85-265 VAC and 120-375 VDC input power, while the low voltage unit is compatible with 16-40 VAC or 19-55 VCD.

VibraRod point level probes are universal in application and are offered in a standard length that extends approximately 9 in. (235 mm) into the vessel. A pipe extended version can come in lengths up to 118 in. (3 m), and a cable extended option can be used for a probe length of up to 65 ft. (20 m).

All units are provided with a relay output for indication of material presence that can be connected to any control device. Additional features include a selectable fail-safe mode and an externally visible bi-color LED.

For more information on the VibraRod point level sensor, or any of Monitor Technologies’ full line of level, flow, particle emission or bin aeration products, contact: Emily Jones at 1-800-766-6486.

SiloPatrol® Inventory Management System
Delivers High Value and Superior Functionality!

Elburn, IL. —The SiloPatrol® Inventory Management System is a field-proven method of providing PC-based inventory management & control and/or supplier managed inventory solutions. The SiloPatrol System delivers cost-effective solutions for a wide range of powders, granular solids, liquids and foodstuffs. SiloPatrol is a reliable means of collecting and centralizing bulk storage inventory data at any convenient on-site or remote location(s). This can be used to bring together multiple plants and corporate locations, or customers and suppliers.

The SiloPatrol System eliminates man-hours needed for making periodic checks of vessel contents. The ability to continually monitor and respond to the measurement data using a simple graphical format via PC eliminates costs associated with overfilling and running out of material.

SiloPatrol increases profits by better matching incoming material shipments to actual demand. You always know exactly how much material is needed, and when to schedule delivery. You can save even more money by shifting the responsibility for basic inventory management to your suppliers by allowing them remote access to the system data.

The SiloPatrol System uses the low cost and state-of-the-art SMU sensor. This sensor is virtually maintenance-free and requires no field adjustments. The primary user interface is SiloTrack™ Version 3.0, a high value multiple user inventory management software package for PC’s. In addition, Auxiliary Output Enclosures and Remote Display Units can be added to create a true management and control network.

SiloPatrol can further increase value by use of its wireless communication interface with the SMU smart sensors. This can save you money on installation and provides reliable long-range communications to the system PC.

The SiloPatrol System provides a flexible graphical interface where you can establish set-points and alarm levels on each vessel. You can have vital information sent automatically via fax, e-mail or pager whenever critical material levels are sensed. Standard reports for measurements and sensor diagnostics can also be sent via e-mail or fax. Management and/or suppliers can automatically receive reports at scheduled times.

For more information on the SiloPatrol Inventory Management System, or any of Monitor’s full line of level, flow, particle emission or bin aeration products, contact: 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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