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Grain Silo Level Indication Solution:

Economical High Level Sensing in Grain Storage Bins

SITUATION:
Keep the cost low, but reliably detect the high level of grain in forty-five (45) storage bins. The lowest cost level indicator / sensor for this type of application is typically a Tilt Switch. In this application all bins are filled with a “broadcaster” device that facilitates the gentle handling of the grain to ensure individual kernel integrity. Tilt Level Switch for Grain

EXPLANATION:
As a result of using a device that fills the bins very gently and slowly, the level in the bin increases very gradually. This reduction in fill rate can prove problematic with tilt type switches as it may be possible to gradually engulf the switch rather than “tilt” it to activate the switch output. The surface area of the tilt switch had to be increased if it was to be activated by the material and tilted to an angle of 17 degrees that would activate it. Making a larger size tilt switch would not be economical.

Tilt Level SwitchesSOLUTION:
Monitor recommended an attachment to its TC-3X tilt switch. This attachment was an “actuator” that consisted of an 8” diameter ball float attached from the bottom of the tilt switch with a short section of pipe. This proved to be the solution and also economical and reliable. Monitor can equip its tilt switches with ball float actuators to meet the application.

Give Monitor Technologies a call and let us put our creative solutions to work for you!

See below chart for other point level options. Click here for more product details.

Point Level Sensor Selection Chart

 

Related Product Solutions
 

>>

Proper Tether Length Makes a Tilt Switch Work Better

   

 

 
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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