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July 2007 : TrueCap RF


trueCap RF
Reliable Level Indicators have No Moving Parts - High Performance For Feed & Grain


Elburn, IL - TrueCap RF Capacitance point level sensors are reliable sensors for feed & grain applications. These sensors are featured with no moving parts like rotary paddle bin indicators and other mechanical type of level switches. The TrueCap sensor is sensitivity enough for virtually any feed & grain application of powder, granular or liquid materials and can be used even on slurries.

The TrueCap family includes a wide variety of probe types to meet virtually every application in feed and grain. In addition, high sensitivity and automatic build-up immunity make these units high performers. Two models exist. The Model MK2 is the pinnacle of RF capacitance level sensors using a universal power supply, pushbutton calibration and a built-in temperature sensors for automatic calibration compensation to make this unit the state-of-the-art in performance and trouble-free reliability. The Model MK2e is standard analog electronic technology with a simple 2-step calibration and cost-effective design. Automatic build-up immunity is provided in both models and either a DPDT relay or SPDT relay output depending on the model.

TrueCap RF capacitance level monitors are available suitable for either ordinary electrical locations or hazardous area locations. Monitor Technologies LLC has pioneered level measurement for powders and bulk solids for five decades. The experience and market knowledge gained 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 Ms. Emily Jones of Monitor Technologies at 1-800-766-6486 (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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