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Economical High Level Sensing in Grain Storage Bins

PROBLEM:
Keep the cost low, but reliably detect the high level of grain in forty-five (45) storage bins. The lowest cost level sensing device 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.

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.

SOLUTION:
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!

 

Related Product Solutions
 

>>

Proper Tether Length Makes a Tilt Switch Work Better

   

 

 
Flexar® GWR  
Global Flour Processor Uses Flexar® Guided Wave Radar

A large global flour processor and food products company recently began using the Flexar® guided wave radar in a total of eighteen (18) silos and bins to manage their finished product inventory.  Readings from these continuous level sensors is reported as being reliable and accurate, even during pneumatic filling, contrary to their previous measuring system.  A previous non-performing ultrasonic system was replaced by the Flexar level sensors.  Flexar guided wave radar level sensors were chosen as the best for pneumatically filled dust laden flour silos.

Eight (8) Flexar level sensors are installed in load-out silos that fill bulk trucks with processed and finished flour.  These silos are 12ft in diameter and 35ft tall.  The finished flour is pneumatically conveyed into these silos.  During filling the internal environment of the silos is very dusty and turbulent.  The finished flour in these silos is used for loading bulk transport trucks for distribution.  In addition, ten (10) Flexar level sensors are installed in 40ft high bins that contain bran.  This material is also sent by bulk transport to end users.

All of the Flexar level sensors are equipped with an RS485 digital communications output that is connected to a PC with a graphical user interface for inventory management purposes.  Monitor’s SiloTrack™ inventory management software is used by the facility to monitor and manage material inventories of both the finished flour and the bran.  SiloTrack allows for multiple user viewing and data access via LAN and this is how the facility will be using the software that provides a flexible, graphical user interface, alarms, report generation and history analysis functions.

Guided wave radar is especially well suited to level measurement applications of dusty powder materials even when measuring during pneumatic filling.  Flexar guided wave radar utilizes TDR (time domain reflectometry) technology.  Radar pulses are continuously transmitted down the sensor’s probe and guided to the material surface where they are reflected back to the electronics along the wave guide.  The time-of-flight of the pulses is measured and directly related to the distance to the material surface and its level.

 

>>Click here for more information about Flexar guided wave radar continuous level measurement sensors.
>>Download Product Bulletin 353A
>>Click here to visit our Flexar Website


 

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