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What happens when you overload a load cell?
If the load cell has been overloaded, mechanical damage has been done that is not repairable. Overloading causes permanent deformation within the flexural element and gauges, which destroys the carefully balanced processing that results in performance to the manufacturer’s specifications.
How do you test a load cell scale?
A load cell test is performed using a digital multimeter. The digital multimeter is connected between the positive signal wire and the negative signal wire of the load cell. The output between them should be equal or to a value specified in the datasheet. This is the test for load cell output resistance.
Is there a colour code for load cells?
Unfortunately there is no standard wiring colour code for load cells so you will need to know from data supplied with the cell which wires are the excitation wires and which wires are the signal wires (see section
What causes a negative reading on a load cell?
Load cell negative reading occurs when the load cell is in an incorrect orientation. If the load cell is upside down, it would produce negative readings under loading. There is usually an arrow on the load cell that shows the direction of loading.
What to look for in a load cell?
An insulation resistance check can further help you identify if moisture is getting inside the load cell. Additionally, a bridge resistance check will determine if there’s a short circuit within the load cell. Zero drift is the condition where zero measurements of the load cell change randomly under no-load conditions.
What are the signs of load cell overload?
The telltale signs of load cell overload are inconsistent display reading, reading not coming back to zero even after the load is removed, the dramatic change of zero balance, etc. Shock overload is one of the most damaging among overloads. Here the weight on the load changes to a significant degree in a very short period.