Summary:For high-precision weighing applications, load cell platform scales must measure the load accurately. To illustrate this measurement precision, an example with a test weight is explained here. This weighing system uses load cells, a summing box, and a meter to read the measurement values.
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As shown in the example, there are four load cells mounted at each corner of the platform. The strain gauges inside these load cells undergo deformation under loading.
These load cells provide an output in mV/V to the summing box where these signals are trimmed to return virtually the same mV/V output. This process ensures that irrespective of the load placement or orientation on the scale, the measurement value remains the same. Such provision is necessary when weighing products that do not self-level (e.g. concrete, flour, etc.)
The summing box also performs the summing operation to combine the outputs from all the four load cells into one single output. This output appears to the strainmeter as a single load cell bearing the load.
If the load fluctuates, the summing box will make the necessary adjustments and will send the final weight data to the integrated strainmeter, or a handheld display.
In cases where local measurement is not viable, you can use remote displays that serve as secondary displays. They can be mounted at a distance from the measurement location via cables.
A digital meter with a USB port will further provide an opportunity to collect the data in a computer for further analysis/assessment.
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