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August 2003: KA/KAX • VibraFork™


Model KA
NEW Housing Design
Revitalizes Bin Level Monitor

Elburn, IL - No more bolts to hold or lose is just one advantage of Monitor Technologies’ new hassle-free housing for the rotary paddle bin monitor. The new housing with 2 conduit entrances improves upon the most reliable, versatile and economical point level control sensor available for detection of dry bulk materials.

Unlike many other available paddle units, Monitor’s rotary paddle level indicators incorporate a feature that automatically shuts off the motor of the unit when the paddle is in a stalled position, which both extends the life of the motor and minimizes maintenance. Monitor’s paddle units also have a built-in slip clutch to protect motor and drive gears from excessive forces and longer-lasting sealed bearings. Additionally, the paddle units’ housing is NEMA 4 and an explosion-proof unit is also available.

Because different material densities, particle sizes and flow characteristics require specific paddles for optimum performance, Monitor Technologies offers a variety of interchangeable paddle assemblies to fit most bulk solid application needs. Additionally, Monitor offers a high-temperature unit and an assortment of process connections and accessories.

New Level Sensor For Liquids Offers Many Options

Elburn, IL - Recently released, Monitor Technologies' VibraFork™ vibratory point level sensor for liquids provides reliable sensing in a wide variety of applications in virtually any industry.

The vibrating probe principle utilized by the VibraFork overcomes typical application difficulties associated with changes in material, electrical dielectric constant, temperature or humidity. The VibraFork is easy to setup and requires no calibration. A high excitation frequency and a unique fork design provide excellent immunity to external vibration.

The VibraFork line of sensors has two versions, “Standard” and “Compact.” The “Standard” version has a traditional instrument housing and provides local indication using a high-intensity bi-color LED and a relay output.

The “Compact” version has a compact stainless steel housing with a small local LED. A choice of outputs, solid state PNP/NPN, 2-wire AC or intrinsically safe, are also available.
The probe configurations available with either the “Standard” or “Compact” versions include the standard probe (4.9 in/125 mm), “SHORT” probe (2.7 in/69 mm) or pipe extension probe.

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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