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January 2007 : RF Capacitance


TrueCap® MK-2 RF Capacitance
RF Capacitance point Level Sensor Use Temperature Sensor and Microcontroller

Elburn, IL - The TrueCap® Model MK-2 RF Capacitance Point Level Sensor from Monitor Technologies has been redesigned. In addition to the reliable attributes associated with the TrueCap line, the Model MK-2 boasts exciting features that make it optimal for point level applications.  Value added to your use of the unit includes the elimination of recalibrating sensors and false indication of material presence/absence.

Unlike other sensors, the new MK-2 uses a temperature sensor to detect changing ambient temperatures to adjust its calibration automatically so that the unit provides the highest degree of calibration stability.  This, in combination with a superior technical electronic design using industrial and mil-spec grade components, means that you get true readings with long term reliability.  In addition, the unit features a universal power supply (48-240VAC or 24-48 VDC), new housing with a twist on/off cover, local visual indication and dual conduit entrances for easier wiring access.  

In addition, the TrueCap Model MK-2 is available with both Class I and II Hazardous location approvals allowing one model to serve virtually any application. For ordinary locations, the MK-2 has the CE Mark.

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 Ms. Emily Jones 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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