Quantum Scale System
Proportional Tare
(Percentage Tare)
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Note
The following explanation on Percentage Tare (i.e., Proportional Tare) comes from Weights & Measures Today, National Conference on Weights and Measures, November 1993.
Percentage Tare Procedure | The procedure used to compute net weight involves the |
| determination of two (2) tare weights. One tare will be a |
| |
| fixed tare for the outer container; the second, a percentage |
| tare for individual wrappers on the items. |
| The store (or product manufacturer) determines the |
| percentage of the gross weight represented by the tare |
| weight on one (1) pound of the wrapped candy (scales with |
| metric units would follow similar procedures). |
| For example, a pound of wrapped chocolate drops is |
| unwrapped and the percentage tare weight determined on a |
| suitable scale (e.g., on a scale with a minimum increment of |
| 0.002 lb.) to be 0.04 pound or 4%. In some stores, similar |
| products such as wrapped candy of different flavors and |
| types are offered for sale at the same price; in these cases, |
| consumers can mix the different candies in the same |
| package. Tare weights can vary slightly on each type of |
| candy, so tare averaging may be used to establish a |
| percentage tare value. Once determined, the percentage tare |
| is programmed into the device with the PLU of the candy. |
| The fixed tare of the bag or other container used by |
| consumers is determined by the seller (e.g., 0.01 lb.) and is |
| either programmed into the device with the Price |
| Code (PLU) for wrapped chocolate drops or is manually |
| entered into the cash register by the sales clerk during each |
| weighing process. |
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Note
The following explanation on calculating the Percentage Tare value is a portion of the Discussion Paper, The Use of Proportional Tare, Weights and Measures Industry Canada, June 22, 1994.
A - 5 | Appendix |
