( click here )

December 2007: SFD-2/SFI



Microwave-based Solids Flow Detector Now CE Mark

Monitor Technologies LLC is pleased to announce the availability of its Model SFD-2/SFI solids flow detector line complete with CE Mark for use in ordinary locations within all European Community areas. The Model SFD-2/SFI uses microwave Doppler-radar technology to continuously monitor the flow and no-flow condition of powders in pipelines and chutes. The product is completely solid state with no moving parts. The Model SFD-2 provides relay output and the Model SFI provides an analog output in response to the flow or no-flow condition.

All sensor and power supply electronics are designed and certified to meet CE Mark requirements for use in the EU. Applications for the SFD-2/SFI solids flow detectors include coal flow in coal fired power generating plants, feed ingredient flow into the pelletizing operation within feed mills and much more. Using microwave technology the sensor can be mounted in applications where non-metallic pipeline or chute is used so that material does not come in contact with the sensor head. If a metal pipeline or chute is used to contain the material the SFD-2/SFI sensor is mounted so that it is non-invasive.

Monitor Technologies LLC is a pioneer in level measurement and monitoring instrumentation, as well as a leading supplier of flow and particle emission instrumentation for the worldwide powder and bulk solids market. The experience and market knowledge gained over almost five decades has earned Monitor a reputation for providing high quality, reliable product solutions. Monitor is located in Elburn, Illinois USA. Give us a call today and let us put our creative solutions to work for you!

For more information refer to or contact us at 800-766-6486 / 630-365-9403. Visit our blog “Level Measurement” at



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


Join Monitor's E-Mailing List!
Enter your Email Address Here:



© 2022 • Monitor Technologies, LLCAll Rights Reserved
Privacy / Cookies Policy & Terms
1.800.601.6319 or 1.630.365.9403

  Translate This Web Page:
Translate text and documents.