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Dry Ingredients Silo Level Measurement Solution:

Food Processing Level Detection...Eliminating Calibration Drift and Re-Calibration of RF Capacitance Probes

“ I have to recalibrate my RF capacitance probe periodically.” This can be a problem in most any industry. But in the Food industry it is especially problematic because many products are made in batch form and even continuous operations can sustain thousands of dollars of out-of-spec product and downtime if the RF capacitance point level sensor isn’t functioning properly, especially due to poor calibration stability. Is this a problem for you? Can you “set and forget” your RF capacitance point level sensor?

The typical RF capacitance style point level sensor requires some form of calibration or “tuning” to the specific installation and application. Varying conditions in the environment (changes in ambient temperatures) can affect the stability of the calibration of these devices. Changes in ambient temperatures can impact the characteristics of electronic components, thereby causing calibration drift. In addition, the quality, or grade, of electronic components affects a probe's ability to maintain a stable calibration.

Many Food industry manufacturers, including snack food manufacturers, have found a solution with the TrueCap® Model MK-2 RF capacitance point level sensor.

The MK-2 sensor combines a unique automatic temperature compensation function, a state-of-the-art microcontroller and the use of high quality industrial and mil-spec electronic components to ensure stable calibration to within its specification of +/- 0.01pf per degree F (0.018pf per degree C).

The TrueCap MK-2 also uses surface-mount components and provides a universal power supply and high-intensity LED’s for local indication of material presence/absence (ordinary location units only).

The MK-2 is available in a wide variety of probe configurations including food-grade acceptable materials of construction. The MK-2 has been providing stable installations free of re-calibration for several years.

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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