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May 2005: VibraRod™ • Flo-Pad


VibraRod™ Offers
Flexibility in Applications

Elburn, IL – Monitor Technologies VibraRod™ point level sensor is a very reliable point level sensing unit that is great to use in a wide variety of applications within the powder and bulk solids markets. Monitor’s VibraRod unit is ideal for bulk solids ranging from 3.12 lbs/ft3 (0.05 kg/dm3) with a maximum particle size of 3/8 inches.

The standard probe size for a VibraRod™ is 9 inches. Pipe and cable extension units are also available for longer lengths in top mounted applications. The pipe extension unit uses 1” stainless steel pipe to extend the vibrating sensor into the vessel, provides structural strength, and affords a means to secure the assembly to the vessel. The cable extension is a polyethylene coated steel cable.

The VibraRod™ point level sensor also has many other excellent features to offer such as a single-prong probe design, a universal power supply, requires no calibration and is very affordably priced. Monitor’s single-prong design helps eliminate false signals that typically exists when material gets clogged or bound between the tines of “tuning fork” design probes. The vibration action of the VibraRod acts as a self-cleaning effect for most materials.

Contact Monitor for more information on the VibraRod™, or any of our full line of level, flow, particle emission and bin aeration products.

Flo Pad
Resolve Material
Flow Problems
Without Noise or Vibration

Elburn, IL. — Monitor’s Flo-Pad bin aerator promotes the flow of any dry bulk powder or granular material from bins, hoppers and silos. Such materials are highly aerated when entering the storage vessels, and flow quite easily entering the vessel by pneumatic or gravity feed. After being in storage for a time, the air escapes and allows the material to pack, and behave more like a solid mass than a fluid mixture. Flo-Pad uses multiple Evassers mounted on a single air plenum chamber to create multi-directional air release and re-fluidize stored material.

Flo-Pad is virtually maintenance free and does not create noise or damaging vibration, like pneumatic or electric actuated vibrating devices. The Evassers have a standard neoprene boot that is designed to prevent material backflow. In addition, the Evassers are less likely to become clogged due to moisture, as are aerators that use cotton or canvas to diffuse the air.

Flo-Pads can be used for virtually any application. They are available in 18 in. (457 mm) and 60 in. (1524 mm) sizes, having 8 and 28 Evassers respectively. The most effective aeration of dry bulk materials is typically achieved by use of multiple rows of Flo-Pads, one row located in each quadrant of the sloping vessel bottom. Flo-Pad maintains a constant 2 to 5 psi (0.14 to 0.35 bar) supply of air. Units are also available for higher pressures of up to 80 psi (5.5 bar), to dislodge and move highly settled materials, and for high temperature applications.

Contact Monitor for more information on the Flo-Pad bin aerator, or any of our full line of level, flow, particle emission and bin aeration products.

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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