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July 2006 : Flexar™



Guided Wave Radar Level Sensor Now Offers ATEX and CSA Approvals for Hazardous Locations

Elburn, IL –Monitor Technologies LLC announces the availability of ATEX and CSA certifications for it's Flexar(TM) guided wave radar continuous level measurement product line. The ATEX certification is Ex II 1/2 GD T75 ... 150C. CSA certification includes Class I, Division 1 & 2, Group B, C and D as well as Class II, Division 1 & 2, Groups E, F and G. CSA certifications apply to both Canada and the USA. These approvals allow the benefits of guided wave radar technology to be extended to areas where hazardous and explosive vapors and dust exist worldwide.

Flexar(TM) guided wave radar product is a continuous level measurement device using TDR (time domain reflectometry) principles where radar pulses area focused to the material surface by the unit's wave guide (typically a heavy duty cable or rod) and the time-of-flight of the pulse reflection back to the instrument electronics is directly related to the empty distance in the vessel and the material level.

Guided wave radar technology has proven successful and the best choice for virtually all powder and bulk solids application as well as a multitude of liquids applications. Monitor Technologies uniquely combines this proven level measurement technology with five decades of expertise in powder and bulk solids level measurement along with the industry leading PC-based inventory management software package.

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!



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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