How do we weigh?
The design and type of vessel impacts the number of bolt-on sensors and the specific placement of them. The quantity and placement of each sensor is important in order to get the most accurate and consistent measurements.
Bolt on Sensors
Bolt-on sensors can only be used on metal supports and should always be installed in pairs. By having two sensors on the same support, the changes in the vessel due to natural bending of the metal structure are canceled out and a true reading of the weight is given. Download Full Bolt-on Sensor Placement Guide
Three of the most common types of vessels:
- Horizontal beam/shear
Legged vessels are some of the most common types of silos; these are simply held up by a leg structure. The primary factor in separating legged vessels into different groups is the number of braces between the legs or supports. A brace is designed to make the structure stronger and more sturdy, usually being able to hold more weight. If there are no braces between the supports, there are no additional factors to consider in determining mounting location of the sensors. Therefore, the number of legs determines the number of sensor pairs that would be required; two sensors per leg. For example, a four legged silo would need 8 bolt-on sensors (4 pairs).
If a vessel is supported by horizontal beams which are connected to vertical legs, it is considered a horizontal beam or a shear application. The weight forces of the vessel are being distributed to the horizontal beams. The horizontal beam connection to a vertical leg creates the shear force in the horizontal beam. The shear force is what is being measured by the sensor in order to determine the weight of the material. The number of support points for each vessel is critical in determining how many and where bolt-on sensors should be used.
Skirted silos have a weight bearing metal wall or ‘skirt’ around the material container. Skirted silos can either be welded together, where panels are used to construct the vessel or can be bolted together. The construction type does impact the placement of the sensor pairs; the sensors need to be placed around the silo so that it is balanced for proper, consistent measurements.