This gives the load cell a cross-sectional appearance similar to structural I-beams seen in construction, and as with them, most of the shear strain is focussed in this thinner vertical web. Strain gauges are mounted on the side surfaces of this web, at degree angles to detect the strain.
At the same time, the top and bottom flanges help resist any moment or bending. Shear beam load cells have become quite popular for medium and high capacity applications, featuring excellent resistance to side forces. They are typically not made for low capacity owing to the difficulty of needing to make a web thin enough to obtain the necessary strain levels.
Bending beam and single-point load cells would be more suitable in such use cases. Flintec has a broad range of beam load cells for purchase, accommodating both large and small volume orders. All of our products are entirely manufactured by us, ensuring high-quality materials and excellent build quality.
Should you need something unique, we can help you with a custom solution. We can offer several services, including mechanical design, electrical and software development, testing and calibration, regulatory and certification governance, up to fully project managed projects. Contact us to find out more about how we can help.
What is a beam load cell, and how does it work? A limitation of canister load cells is its inability to normally withstand side loads. Bending beam load cells, at the first glance, may be thought of being similar to the shear beam. However, the two have different elastic elements.
The bending beam does not have a reduced cross-section for the strain gauges, rather this beam is machined all the way through. The strain gauges are bonded as shown in the Roberval-type load cell. These load cells use the concept of the "I"-profile shear beam described above. In this design, the elastic element of spring material has a reduced cross section where the strain gauges are bonded.
One end of the shear beam contains the mounting holes, while the other end is where the load is applied. These are commonly used in low profile scale applications. The double-ended shear beam is similar to the single-ended. Instead of being secured only at one end with the load applied to the other end, the double-ended shear beam is secured at both ends with the load applied to the centre of the load cell.
Load measuring pins or bolts are used to measure tension. Load measuring pins or bolts are typically installed into machines in place of normal shafts wherein it acts as a normal piece of the assembly. These are hollow disc load cells that have a circular array of holes located about half of the radius from the centre of the disc.
These load cells have an elastic element deformed by tension or compression at both ends. Its strain gauges are usually configured in an "X"-pattern. These strain gauges are compact, inexpensive, monolithic and easy to install.
These are based on the principle of a wire wound spring. The helix works by converting the applied load into a torsional moment in the wire. This configuration is insensitive to off-axis loading due to how the torsional moment propagates through the helix. The orientation of the strain gauge is unimportant. These load cells have a low profile enabling them to be used in a variety of applications. However, they can only measure compression. A smaller profile of button load cells is called miniature load cell.
The strain gauge is made up of thin wires which are prone to the effects of the environment. Varying temperatures can expand or contract a strain gauge creating noise and inaccurate measurements.
Corrosion can also creep into the elastic element which will shorten the life of the device. Aside from the possible deterioration, the load cell itself may cause safety problems to the environment. For applications in an industrial plant such as a refinery or chemical plant, there is a risk of igniting flammable liquids and gases. For these reasons, load cells are constructed either of the following. Hermetically sealed load cells offer the best protection available. This is achieved by welding, epoxy sealing or glass-to-metal bonding.
The inside cavity is filled with a pressurized inert gas. Hermetically sealed load cells are air and water tight which is characterized by Ingress Protection IP rating. These are designed in normal environments in indoor or protected outdoor applications. Environment protection of open load cells is through soft resin or rubber covering.
This type of protection makes the strain gauge vulnerable to moisture and temperature fluctuations. Explosion proof means the load cell will contain or prevent an explosion that may originate within the device. For any device or equipment with internal cavities exposed to flammable gases, these gases will eventually creep inside filling the cavity with an explosive mixture. Sparks from the load cell will ignite this mixture causing an explosion. An explosion proof rating can be achieved by a combination of containment, energy limitation and segregation.
Rated Capacity or rated load is the maximum capacity or weight that a load cell can measure. When designing a system to measure a certain weight, the load cell rated capacity must be greater than the weight.
Except for certain laboratories where precision mechanical balances are still used, strain gauge load cells dominate the weighing industry. Pneumatic load cells are sometimes used where intrinsic safety and hygiene are desired , and hydraulic load cells are considered in remote locations, as they do not require a power supply. Strain gauge load cells offer accuracies from within 0.
Load Cell Types Load cell designs can be distinguished according to the type of output signal generated pneumatic, hydraulic, electric or according to the way they detect weight bending, shear, compression, tension, etc. Compression Load Cells A compression load cells will often have an integral button design. They are ideal for mounting where space is restricted. They offer excellent long term stability. They are ideal for space restricted environments.
Your cart contains 0 packages. Store Service Applications Support search Get in touch. How it works? How does a Digital Load Cell Circuit work? Fig 1: Metal Foil Strain gage. Source: ScienceDirect Structurally, a load cell is made of a metal body also called flexure to which foil strain gauges are bonded.
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