Why Different Scales Vary in Accuracy of Scale Weights

April 8, 2020

When you have to use scales in your business, you know how important it is for the weights to be accurate. However, even when it comes to accuracy, not all weights are equal. Understanding why scale weights vary can help you understand why it’s vital to rely on experts to help you pick the right weights for your scales.

Why do scales vary in the accuracy of scale weights?

The primary reason accuracy varies in scale weights is because each scale requires a specific classification, which is based on the measures for the scales. The National Institute of Standards and Technology (NIST) is the agency that determines the specifications and tolerances for scale weights to ensure accuracy. Their guidelines ensure that the errors in the scale are minimal, so they don’t affect the weight outcome. The division accuracy is between 3000 and 5000.

How does the accuracy of the scale weight vary?

The lower the number of the class, the more accuracy needed for the weights. There is a certain amount of error built into the classifications, but the error ratio varies based on the classification of the weights, as well.

For example, the weights used in class 1 weight requires an incredibly small error ratio, while a class 7 weight is different. The reason these differences occur is because of the different uses for the classifications. The right error ratio has to be used with the correct specifications of the scales based on their classifications.

How are the scale weights classified?

Scale weights are classified based on how much weight they can use and the types of weights allowed. The Cal certificates provide instructions for what weights are to be used for each scale.

For example, class 3 weights can only have a smooth finish. Class 1 weights can have no stamping; they can only be engraved, or laser etched. Class 1 weights must also have a smooth finish so that any dirt that lands on the weight can be removed with a puff of air.

Classification also includes the materials used in the weights. For example, a class 7 weight can be made of any stable material. Some weights have adjustment cavities to ensure they remain within the appropriate weight and density.

Regardless of class, weights cannot be made of materials that take in mass from humidity or oil from hands that handle them. In addition, the exterior of the weights cannot be too rough. Otherwise, they will pick up dust and skin cells, which can affect the accuracy of the weights.

The accuracy of scale weights is essential but also complex.

That’s why it’s valuable to rely on experts who can ensure that the scale weights are within standard measures of accuracy.

Accurate scale weights can be expensive, with some costing as much as $15,000 for one weight. Not only are the correct weights needed, but they need to be maintained, as well.

Organizations like ours have the weights you need for your scales and can ensure they have the accuracy required through class 1 specifications. For example, our weights are calibrated and inspected every year to ensure they are within the correct tolerances as well as maintained and protected to ensure their accuracy.

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Texas Measurement & Calibration Solutions, LLC