Precautions for the use of resistive load cells – ifm

Create Date: 2024-8-30 12:03:23|Source: IFM/ifm

(1) When the strain limit increases with the strain, the nonlinearity of the output of the strain equipment increases, and the error reaches 10%, the strain limit of the strain equipment is general.

                                 Precautions for the use of resistive load cells – ifm

(2) After the mechanical hysteresis sensitive grid, subbase and adhesive layer are subjected to mechanical strain, residual deformation will generally occur, resulting in mechanical lag of strain equipment.

(3) Zero drift and creep at a constant temperature, there is no mechanical strain, and the resistance of the strain equipment changes with the moment, which is called zero drift; The resistance of a strain gauge changes with the moment, which is called creep.

(4) Internal stress caused by zero drift and creep; Under a certain temperature and load, the internal structure of the resistance wire material, adhesive and substrate changes.

(5) The insulation resistance between the outgoing wire of the strain gauge equipment and the test piece stuck to the test piece is generally 50-100m, and the long-term accurate measurement requirements are greater than 100m or even 10g.

(6) The maximum current of the strain gauge equipment through the maximum operating current shall be allowed to operate normally. Generally, the static measurement is 25mA, and the dynamic measurement is 75-100mA. Excessive operating currents can lead to overheating of the strain gauge, changes in sensitivity, zero drift and creep addition, and even combustion.

(7) The change in the resistance of the strain gauge caused by the temperature change is generally of the same order of magnitude as the change in the resistance caused by the strain, and it is necessary to use an appropriate circuit for temperature compensation.

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