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February 2002 : Tech Support• SFI


Live Technical Support

Elburn, IL- Monitor Technologies continues to offer an interactive and exciting web experience. The newest addition to is a Live Chat with Monitor's application specialists.

Available Monday through Friday from 7 a.m. to 5 p.m. CST, Live Chat offers you the opportunity to communicate with Monitor's technical support specialists in a real-time environment. No more leaving voice mail messages or waiting for responses via e-mail. Now you can ask your question and immediately receive an informed response.

Our company application/product specialists, Andy, Jim and Greg are available to answer your questions. Some of the issues Monitor's application specialists are prepared to handle include reviewing your specific application, recommending the best device to meet your needs, product questions, installation and/or maintenance assistance.

Monitor's expert staff is waiting to help you. Just click on the "Live Chat" button located on every page of this website.


Model SFI
Maintenance Free Solids Flow Indicator

Elburn, IL - Using microwave technology, Monitor's Solids Flow Indicator (SFI) detects flow in solid material applications including gravity chutes and pneumatic pipelines. The SFI features an analog output relative to the magnitude of flow. This provides more information for the user than a “on-off” flow detector.

The non-contact/non-intrusive design provides long-term reliability and elimination of process contamination. Intrusive probes might wear out, break off or inhibit material flow. The non-contact/non-intrusive design is just one of the many reasons that the SFI is maintenance free.

The SFI is equipped with a rugged housing that is rated for Class II dust-ignition proof environments and meets NEMA 4 water-tight and dust-tight classifications.

Other features include a built-in averaging adjustment for application customization and LED indicators for visual indication of material activity and verification of operation. The SFI also has an excellent sensitivity range.

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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