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Continuously Measuring Corn Surge Hopper Level

PROBLEM:
What continuous level measuring product is ideal for challenging applications, such as a corn surge hopper in an Ethanol facility where the material level is constantly changing and internal vessel environment extremely dusty?

EXPLANATION:
The process of making Ethanol fuel from corn involves using a surge hopper.  A surge hopper typically is used to absorb the peaks and valleys of the raw material requirement during the continuous processing of the grain to make Ethanol.  As material continuously is fed into the hopper and the process draws off the required raw material to process, the levels of corn rise and fall and dust from the grain and field is ever present.  This makes the surge hopper a challenging application for a continuous level measurement sensor.

SOLUTION:
Monitor recommends our continuous level measurement technology, Flexar™ guided wave radar, which is unaffected by airborne dust, bulk density and temperature changes. The Flexar™ guided wave radar unit uses TDR (time domain reflectometry) technology to make accurate measurements at a distance of 100ft (30m) in solids and 200ft (60m) in liquids.  The TDR microwave pulses are guided to the material surface along a continuous stainless steel cable of 0.31" (8mm) diameter.  The microwave pulses reflect off the material surface and the time of flight results in the distance measurement of empty space.  Ignoring any and all dust particles.  The unit calculates the material level based on the height of the surge hopper and transmits this data via a 4-20mA output signal to a remote receiving device such as a control system or digital display meter, or via RS485 communications for use with Monitors’ SiloTrack inventory management system.

Flexar™ guided wave radar continuous level sensors are a proven radar technology installed in thousands of bulk solids applications worldwide. Monitor Technologies is the leading supplier of level measurement and monitoring solutions for powder and bulk solids applications.

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

 

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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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