S-Type Load Cells 101
There are many different types of devices used in test and measurement, from load cells to torque transducers and tension links to multi-axis sensors. In addition, each of these product types has sub-categories based on various specifications, capabilities, capacities, and application requirements.
Discussing load cells, different models and configurations depending on the use case, the amount of force measurement or weighing requirements for a particular load, dimensions, and even test environment considerations. No matter what our customers need, we have standard and custom load cells up to the task. Our 101 series highlights the innovative miniature load cell sub-category of Interface S-Type Load Cells.
What Is an S-Type Load Cell and What Is It Used For?
S-type load cells, sometimes called s-beams, get their nomenclature from the “S”-looking model of the load cell. They are shaped this way to measure well-controlled tension and compression forces. Engineers and testing labs prefer them for their precision, size, material, and ability to fit in limited spaces. They are often used for weighing, in test machines, and in product designs for ongoing performance measurement by OEMs.
An S-type load cell is often used in a system designed to stress-test products in a controlled environment for fatigue testing, measuring how the product stands up to force over long periods. The benefits of interface s-type load cells are that they are very cost-effective, highly accurate, easy to mount, and flexible, as they can be used universally for tension and compression testing. They are also smaller than typical load cells, providing major benefits when space is limited or when test product dimensions are small.
Interface offers a wide range of specialized miniature S-type load cells, including sealed, micro-size, fatigue-rated, high-temperature-rated, low-height, overload-protected, and intrinsically safe models to meet all testing protocols and plans. You can see all the S-type models here.
An S-type load cell is generally used with eyebolts or rod-ends in tension, which can cause binding or the associated hardware to unthread. These uniquely designed load cells should not be used when weighing an object that can sway or rotate. Additionally, an S-type load cell is not recommended when the load cell will be used for both tension and compression, where accuracy in compression is critical. In this case, we’d recommend a shear-type load cell.
S-Type Load Cell Applications
Prosthetic Load and Fatigue Testing
Prosthetic limbs must be tested under extreme loading conditions during falls, accidents, and sports activities. Fatigue testing of prosthetic components determines the expected lifespan under normal use. Interface suggested a static load test apparatus using SSMF Fatigue Rated S-Type Load Cell attached to hydraulic actuators to apply and measure loads. The fatigue testing machine uses the SSMF Fatigue Rated S-type Load Cell to apply and measure cyclic loads. During the fatigue test, the actuator repeatedly applies and removes the force to simulate activity such as walking. Tilt tables may also apply forces at various angles to simulate the heel-to-toe movement of walking or running. Using this solution, engineers can determine whether prosthetic materials and designs will withstand the rigors of daily use and occasional high-load situations. Read more here.
Furniture Fatigue Cycle Testing
To meet safety protocols for manufacturing various furniture products, fatigue testing, shock testing, and proof testing must be rigorously performed before diffusion into the marketplace. Force testing simulations on furniture products are critical to determining the posted max loads to protect manufacturers from liability arising from misuse or overloading. Using an Interface Model SSMF Fatigue Rated S-Type Load Cell along with an Interface Model 9890 Strain Gage, Load Cell, & mV/V Indicator provides a solution that measures the force being applied in fatigue cycle testing of a furniture product, in this case, testing the rocking mechanism in an office chair. Unlike similar load cells, the Model SSMF is fatigue-rated, making it highly suitable for fatigue testing. No fatigue failure of any fatigue-rated Interface load cell used within its ratings has ever been reported. The furniture manufacturer obtained accurate data on the office chair’s rocking mechanism as it was fatigue-cycled to failure. Adjustments were made to the design to improve the safety and life of the furniture, ensuring product quality and protecting the manufacturer from future liability. Read more here.
Interface S-Type Load Cells are highly effective, accurate, and flexible products used for various applications needing compression and tension force testing. To learn more about Interface’s S-Type Load Cells, you can also visit here or call us today to speak to an application engineer who can help you select the right product for your next project at 480-948-5555.
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