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Weight Cleaning Procedures

Source: Rice Lake Weighing Systems

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White Paper: Weight Cleaning Procedures

It is essential that weights being calibrated as well as the standards used be clean if the calibration is to be accurate and meaningful. Therefore, a cleaning procedure should be considered as a part of every calibration.

Categories of Weights
For cleaning purposes, weights may be divided into four categories:

  1. One-piece weights: This category will include all one-piece weights except lacquered weights, sheet metal weights, and small wire weights.
  2. Screw-knob weights: This category will include all weights with adjusting cavities except lacquered weights.
  3. Lacquered weights: This category includes all lacquered or painted weights.
  4. Sheet metal weights and wire weights.
One-piece weights
One-piece weights, one gram and larger, are steam cleaned. The weights are either held or placed in a jet of steam and manipulated so that the entire surface of the weight is subjected to the cleaning action of the steam long enough to clean it. A superficial steaming is not enough. The weight is then dried, either by evaporation or careful wiping with a soft non-abrasive material such as high grade cheesecloth, free from oil and other substances that could leave a residue on the weights. Care must be exercised that no water spots are left on the weights as they dry. Visible particles on the weights should be brushed or wiped off before steam cleaning them. If a steam generator is not available, one-piece weights may be cleaned either by immersing them in a hot or boiling distilled water bath in a non-metallic container, or according to the procedures for screw-knob weights. Occasionally, a weight will have foreign material adhering to it that requires the use of solvents. Ethyl alcohol is a good general solvent. If alcohol does not remove the material, other solvents may be used. Alcohol is then used to remove any film left by the other solvents. The weights are then steam cleaned as outlined above.

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White Paper: Weight Cleaning Procedures