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Cement Level Measurement Solution:

RF Capacitance Cable Extension Unit More Rugged For Level Detection of Aggregates, Concrete, Ready Mix Cement

“I need to monitor the presence of material level at a high point without the unit being damaged by the shifting of heavy aggregate material”. Typical to any ready mixed concrete batch plant there is a continuous need to reliably monitor the level of raw ingredients. Some of the stone aggregates included into concrete mix are bulky and heavy. A level monitor with a rigid sensing element, such as a solid rod extended rotary paddle unit, can be damaged.

Ready mixed concrete batch plants do exactly what their name implies. They 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.

Relative to the storage silos the concrete batch hoppers are rather small and elevated so that trucks can pass underneath for loading. In operation, trucks pass underneath the batch hopper and the ingredients are batched directly into the trucks. As the batching progresses the hopper’s contents are quickly drawn down and need frequent replenishment. It isn’t unusual for am automated batch plant to know the exact number of batches the hoppers can facilitate. As this number approaches the process of filling the hoppers from the large storage silos begins. As the hoppers approach a full condition something is required to detect this full condition and stop the filling process. This is where point level detection is used.

The TrueCap® Models MK-2 and 2e are ideal for these applications. The flexible cable extension probe available with the TrueCap product line eliminates this problem. When material shifts the cable probe it flexes right along, thereby eliminating the damaging effect caused by shifting material.

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


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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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