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December 2009: Model PZP
Vibratory Level Indicator Is Ideal For Materials With
Lower Bulk Densities
PZP Vibratory Point Level Indicator

The Model PZP vibrating style point level sensor provides exceptional sensitivity for detecting bulk solid materials with a density as light as 1.25 lbs./ft.3 (pounds per cubic foot) where other sensor technologies might be ineffective. Additionally, the PZP does not require calibration and uses a unique diamond shape single element that is immune to material packing and bridging, unlike traditional tuning forks. Plus, it has no mechanical moving parts.

The Model PZP is also designed for versatility. It's ideal for situations where the range of bulk density, particle sizes, humidity levels, and/or dielectric constants of the materials being stored or collected (dust collection systems) varies widely. This can be a challenge for many level sensor technologies; however, the PZP is capable of detecting bulk solid materials with a density as light as 1.25 lbs./ft.3 all the way up to 100 lbs./ft.3.

The Model PZP vibrating point level sensor uses dual piezoquartz crystals. These crystals respond to electrical excitation by vibrating, which results in the vibration of the sensing element at about 280Hz.  The uniqueness of the PZP's diamond shape sensing element and electronics provides the sensitivity to detect very lightweight materials, in addition to heavier materials.  Applications for use include high and low level indication and as a back-up for dust collection systems. Typical materials include plastics, cement, fly ash, chemicals, lime, clay, sawdust, food, flour, rice, cereal and more.

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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