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February 2010: VibraRod™ Vibratory Bin Level Sensor
VibraRod™ Level Indicator Now With A
Universal Power Supply

VibraRod™ Vibratory Bin Level Sensor

Monitor Technologies’ VibraRod™ vibratory type bin / silo sensor is a very reliable point level indicator that can be used in a wide variety of applications within the powder and bulk solids markets. Monitor’s VibraRod unit is ideal as a high level indicator for bulk solids as low as 3.12 lbs/ft3  (0.05 kg/dm3) with a maximum particle size of 3/8 inches (9.5 mm).

The ordinary location VibraRod™ point level sensor now has a universal power supply (20-255V AC/DC). “This allows customers with various power supply requirements to specify a single part number for all of their different voltage requirements,” says Greg DeRudder, Product Manager for Monitor Technologies.  The VibraRod also has many other useful features such as a single-element probe design, requires no calibration and a choice of probe configurations. The single-element probe design helps eliminate false signals that typically exist when material builds up between the tines of “tuning fork” style probes.  Also, the vibrating action of the VibraRod tends to self-clean the probe for most materials.

The standard length of the inserted portion of the probe for the VibraRod™ is approximately 8 inches (203 mm).  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. For more information, please visit or call 1-800-601-5953 / 1-630-365-9403.

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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