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May 2008: SFI & SFD-2


Solids Flow Detectors

Solids Flow Monitors Improve Process Performance

The Model SFI and SFD-2 line of solids flow detectors provide analog or relay outputs to indicate the flow / no-flow condition of powder and bulk solids materials in chutes and pneumatic conveying lines.  Using microwave Doppler radar technology these units are non-invasive and extremely reliable and rugged to withstand the rigors of the installation and your process extremes.
Solids Flow Monitors like the Model SFI and SFD-2 can be used in a wide variety of applications.  One customer uses the analog signal from a Model SFI unit to monitor the flow of carbon black in toner cartridge manufacturing to ensure positive flow before further processing and to detect no-flow and possible plugged conditions.  Another uses the Model SFD-2 solids flow detector to monitor the flow of coal into the burner of a coal-fired power plant to detect no-flow conditions and ensure safety.  These two applications illustrate the potential for use in improving your process efficiency and maintaining process safety.  

The Model SFI and SFD-2 solids flow monitors are brought to you by Monitor Technologies LLC.  Monitor Technologies 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!




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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