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E015 - Multi-Axis Loadcell Application

A multi-axis loadcell is a considerable investment so it is imperative that the complexities of the application are thoroughly examined to ensure the correct loadcell is selected.

Novatech manufactures user friendly multi-axis loadcells with each axis functioning as a normal single axis loadcell. No computational mathematics is required.

Current multi axis loadcell types:

F233 - 3 axis force, ±100 N to ± 5 kN

F232 - 2 axis force, ± 100 N to ± 5 kN

F307 - 3 axis force, ± 20 kN

F314 - 2 axis force, ± 2 kN to ± 10 kN

F310 - force and torque, ± 50 N to ± 2 Nm

NB. Load ratings are invariably outside of those detailed above. Consult our Engineering department to explore the possibilities.

Imperative Issues and correct specification:

  1. The application mechanics must be defined in terms of forces, moments and geometry.
  2. The force/moment system should be related to the possible physical fitment of our loadcell device that requires a live input and reaction (earth) fixing.
  3. Once the above is determined Novatech will evaluate whether a loadcell type can meet the needs of the mechanics.
  4. The agreed calibration force centroid forms part of the loadcell specification. Novatech will carry out tests to determine errors caused by variation in force centroid position if required.
  5. Note: If 3 axis loadcells are ordered without consultation, the standard force centroid is adopted as detailed within the product datasheet.
  6. Error evaluation is recommended since all multi-axis loadcells suffer from ‘cross talk’ errors due to coupling of the monocoque structured sensing elements. Normally the maximum cross talk uncertainty for our ‘user friendly’ designs is 3%.

Cross talk is further explored within our Engineering sheet E009.

Loadcell type suitability:

  1. F233 - forces in 3 axes at a known calibration centroid, moment sensitivity test recommended for force centroid variation.
  2. F232 - 2 axis forces in any two mutually perpendicular axes where a third axis force is present and is required not to influence measurements.
  3. F307 as F233 above.
  4. F314 - an economic solution to two axis force measurement whereby there is no third axis force to influence the loadcell that is vulnerable to extraneous force induced error.
  5. F310 - force and torque in a single axis only. No extraneous force tolerance.