Load cell symmetry refers to whether a load cell exhibits the same sensitivity for both compression and tension usage. All load cells have a non-symmetry of a greater or lesser extent. The linear representation for compression in a load cell is not, by default, symmetrical to the linear representation for tension. Thus, when both sensitivities are mapped, the sensitivity curves for compression and tension are different and have a different slope.

Most tension and compression load cells are used in only one direction for an application so the question of symmetry is not an issue. On some occasions, though, applications might call for true symmetry in a load cell. An example might be an application that measures both compression and tension in a hydraulic line. In this case, working with a single calibration factor for both directions might be preferred to having to balance two calibration factors. This convenience can be achieved if the load cell exhibits near true symmetry. It is possible to achieve near true symmetry in a load cell. The process, however, is expensive.

Note: Symmetry can be calculated and minimized for customers where this phenomenon is an issue. Calibration class load cells have very low symmetry characteristics.