What is a Tension Load Cell?

How Do Tension Load Cells Work?

Tension load cells, like all other modern load cells, are essentially transducers that convert force or weight into an electrical signal by way of strain gauges. When experiencing a load, the main body of the load cell deforms slightly. The strain gauges, which are firmly bonded to the load cell body also distort in kind, altering their electrical resistance. This generates a voltage signal that is proportional to the initial force or weight.

Design

Tension load cells are designed to suit applications that involve suspended weights. As such, they often need to sit in-line with the dependent object, typically integrated into the supporting apparatus. The ‘S’ or ‘Z’ shape of these load cells is because of this requirement. Both the upper and lower limbs ensure that the mounting holes are in-line with the central axis.

In essence, a tension load cell functions similarly to specialised beam load cells. The central bar acts in just the same way as a beam load cell does, with strain gauges positioned to either detect bending or shear strain. The difference is that there is no fixed end to cantilever against. With conventional beam load cells, one end is typically fixed to a base, and the load is introduced on the other ‘ free’ end, much like a diving board. In an S-type tension cell, neither end is fixed, but rather one end is connected via the upper arm to the apparatus above, and the other end is connected via the lower arm to the apparatus below.

As load cell tension applies, there is a pull up on one side of the central bar, and an equal pull down on the other end of the central bar. The differential across the central bar causes the deformation which is picked up by the strain gauges.

Among the innovations in this area are miniature tension load cells, known for their compact size and suitability for limited spaces. High precision load cells offer exceptional accuracy, essential for critical scientific and industrial weighing applications. Moreover, the tension and compression load cells offer dual functionality, expanding their use across various disciplines that require versatile and reliable weighing solutions.

Flintec Products

Flintec has a number of tension load cells available 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.