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Detecting High Sand Level in Settling Tank

PROBLEM:
A company that processes silica sand needed a point level indicator to monitor and indicate a high sand level in a settling tank. The slurry sand was fed into the settling tank where the sand and water would separate. The sand would settle to the bottom of the tank and the water would be decanted from the tank. If the sand level reached the decantation valve it would foul the valve and cause the process to be shutdown.

EXPLANATION:
Interface level measurement usually presents challenges unseen in single material detection applications. In this case the level indicator needed to ignore the water and detect the presence of the sand. It had to operate in a liquid environment and detect the solid sand material. The company needed a device that would work, and work consistently. Many different level detection devices were tried without success. Some were not immune to water infiltration, while others could not differentiate between the water and the water-saturated settled sand.

SOLUTION:
Monitor recommended its Model KA rotary paddle bin level monitor with solid extension and guard and a paddle suitable for the target material. The unit was top mounted above the valve so that water could not penetrate into the unit through its paddle shaft seal. In addition, a stainless steel shaft and guard was used. The extension allowed the sensing alarm point to be adjusted to suit the application.

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

 

Related Product Solutions
 

>>

"Flexible" High Level Detection in Finished Feed Silos at Hubbard Feeds in Mankato, MN

 

>>

Eliminating Premature Rotary Paddle Bin Level Indicator Motor Failures at Strong Company, Inc.

   
 

 

 
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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