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June 2003: Tilt Switches • SafePoint®

 

SafePoint™
 
Eliminate Bin Overflow

Elburn, IL - Monitor’s Tilt Switches are economical and trouble-free point level controls for dry bulk materials. The units can be used as high-level indicators to eliminate bin overflow or to control levels in open piles. Monitor offers two different models of Tilt Switches, each suited to satisfy different application requirements.

Monitor’s Model TC-3X is a light-duty Tilt Switch constructed from cast aluminum. It is ideally suited for applications where relatively light weight, moderately sized materials are handled (15-60 lb/ft3 or particle sizes less than 2 inches). Typical application materials include grain, feed, plastic pellets, and pet food. The TC-3X has a dust-ignition proof approval rating and therefore can be used in hazardous location environments.

The TC-1 is a heavy-duty, weatherproof Tilt Switch constructed from cast iron. It is ideally suited for applications where heavy coarse materials are handled (>45 lb/ft3 or particle sizes exceeding 2 inches). Typical application materials include coal, ore, rock, aggregate, and sand.

Both models are easy to install and are available with optional ball-float and paddle-type actuators. These extension actuators can increase sensing repeatability and protect the Tilt Switch from direct contact with coarse material.

Flo Pad
Evolution in Rotary Paddle Technology

Elburn, IL - Using industry-first magnetic sensing, Monitor’s SafePoint® is a “true” fail-safe rotary paddle bin level monitor. The SafePoint provides the ultimate in performance wherever critical continuous operation must be ensured.

To be a “truly” fail-safe device, the SafePoint monitors both material presence and its own electrical and mechanical operational status on a continuous basis. An indicating light on the top of most units provides local visual indication of operating status. Additionally, the SafePoint has separate outputs for material sense and unit status (fault conditions).

While the SafePoint bin monitor is an evolution in rotary paddle technology, it continues to use proven operating techniques. Unlike many other available paddle units, the SafePoint incorporates a feature that automatically shuts off its motor when the paddle is in a stalled condition. This extends the life of the unit and minimizes maintenance.

A wide variety of process connections, accessories and configurations are available including hi-temp models and models with hazardous location approval.

 
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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