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Cement Silo Aeration Solution:

Moving Cement Powder In Concrete Batch Plants

Cement Silo AerationSITUATION:
“I can’t get cement powder to flow freely from my cement silo.”

EXPLANATION:
Ready mixed concrete batch plants take the basic components needed to form concrete, i.e. sand, rock and cement powder, and batch them together for loadout into concrete trucks. Concrete is used as a versatile construction material and there are literally tens of thousands of batch plants around North America.

Unfortunately the nature of cement powder is that it packs when in a storage condition, making it very difficult if not impossible to flow freely when needed. In consistent flow of cement powder threatened the quality of the concrete mix and the efficiency of the batch plant. Off spec concrete results in considerable waste and quite possibly expensive re-work.

SOLUTION:
Bin vibrators were considered but the fugitive vibration caused damage to peripheral equipment such as piping joints and process instrumentation. The installation of the Evasser from Monitor Technologies LLC proved to be the solution.

Clever placement of several Evasser aeration devices, recommended by Monitor Technologies application specialist and technical support personnel, kept the cement powder fluidized and flowing when required. This prevented the cement from packing, eliminating the root cause of the problem. The Evasser bin aerator operates silently from air supplied by the process plant air source so wear on the structure was not a factor.

Give Monitor Technologies a call and let us put our creative solutions to work for you!

 

 

 
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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