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August 2008: Model PZP Vibrating Level Sensor


PZP Vibratory Sensor

Unique Vibrating Level Sensor Ideal For Dust Collection Systems

Dust collection systems require reliable monitoring of high level material conditions in their hoppers for safety and proper operation.  Material high level backup conditions in the dust collector hopper can create conditions that can damage the equipment and can lead to fires or explosions in some cases.  These dust collection systems are used for collecting a variety of materials.  Many of these materials can be very light in weight because of the small nature and density of the dust particles.  The range of bulk density and dielectric constants of materials collected varies widely.  This can be challenging for most level sensor technologies, but not for the unique Model PZP vibrating rod sensor from Monitor Technologies.  Monitor is pleased to announce that its Model PZP vibrating point level sensor is capable of detecting bulk solid materials with a density as light as 1.0 to 1.5 pcf (pounds per cubic foot) all the way up to 100 pcf.  In addition, 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.

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.  This ultra-lightweight sensing capability down to as light as 1.0 - 1.5 pcf make this level sensor ideal for dust collection applications.

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 us at 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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