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Error Diagnostics of Eccentric Loadings of Single Point Load Cells

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  1. If the load is applied eccentrically (not in the centre of the load cell), an error can appear. This error is maximum ± 0,0000085 % / cm.
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  2. Example: Platform size 80 x 60 cm.
    If a load is applied and its centre of gravity is in a radius of 25 cm from the load cells centre (r = 25 cm), the indicated signal can show an error of 25 cm x 0.0000085 % / cm = 0.00002125 %.
    In clearer values:
    Load Cell Capacity Load applied Error ±
    050 kg 050 kg 0.011 kg
    070 kg 070 kg 0.015 kg
    100 kg 100 kg 0.021 kg
    150 kg 150 kg 0.032 kg
    200 kg 200 kg 0.043 kg
    300 kg 300 kg 0.064 kg
    500 kg 500 kg 0.106 kg
    600 kg 600 kg 0.128 kg
    635 kg 635 kg 0.135 kg
  3. To reduce such an error, the load should be applied – if possible – in the centre of the platform (directly over load cell), or well-proportioned all over the platform.
  4. Extreme eccentric loadings should be avoided. They not only create errors in the readings, but can also damage the load cell due to the leverage effect. This can be seen when the zero signal changes, so the tare value.