“Estimated sign”的意思、由来-开放百科全书

词条

Estimated sign

释义

Tolerable negative error
References
External links

The estimated sign, ℮, also referred to as the e-mark or "quantité estimée" (Unicode U+212E), can be found on some pre-packed goods in Europe. Its use indicates that the packaging fulfils European Union Directive 2009/34/EC.^[1]

The scope of the directive is limited to packaging that has a predetermined nominal quantity of between {{convert|5|g}} and {{convert|10|kg}} or {{convert|5|ml}} and {{convert|10|l}}; is filled without the purchaser present, and where the quantity cannot be altered without opening or destroying the packaging.

The estimated sign indicates that:

the average quantity of product in a batch of packages shall not be less than the nominal quantity stated on the label;
the proportion of packages having a negative error greater than the tolerable negative error shall be sufficiently small for batches of packages to satisfy the requirements of the official reference test as specified in legislation;
none of the packages marked have a negative error greater than twice the tolerable negative error (since no such package may bear the sign).

The tolerable negative error is related to the nominal quantity and varies between 9 per cent on packages nominally {{convert|50|g|abbr=on}} or {{convert|50|ml|abbr=on}} or less, to 1.5 per cent on packages nominally {{convert|1|kg|abbr=on}} or {{convert|1|l}} or more. The tolerable error decreases as nominal quantity increases, and is done by alternating intervals where there is a percentage error and intervals where there is a fixed error (and thus over those intervals the percentage error decreases).

The sign looks like a stylised lowercase "e" and its shape, ℮, is precisely defined by an EU directive. It must be placed in the same field of vision as the nominal quantity. The sign has been added to the Unicode list of characters at position U+212E.

The estimated sign may be printed on a package if:

the quantity of product in the package and its labelling meet the requirements, and
the packer either measures the content of each package or carries out production checks in accordance with procedures recognized by the competent departments in the member state, and
the packer holds at the disposal of those departments documents containing the results of such checks and corrections and adjustments as have been shown to be necessary.

Tolerable negative error

Error tolerance decreases as nominal quantity increases, by alternating intervals of a given percentage error with intervals of a given amount error: these interpolate between the stepwise decreases in percentage error.

The estimated sign indicates that the average quantity of product in a batch of packages shall not be less than the nominal quantity stated on the label.

Table of tolerable negative errors
Nominal quantity in g or ml	Tolerable negative error
0000}}5–50{{0\|000}}	9%
000}}50–100{{0\|00}}	4.5 units
00}}100–200{{0\|00}}	4.5%
00}}200–300{{0\|00}}	9 units
00}}300–500{{0\|00}}	3%
00}}500–1000{{0}}	15 units
{{0}}1000–10000	1.5%
10000–15000	150 units
Above 15000	1%

When using the table, the values of the tolerable negative errors shown as percentages in the table, calculated in units of weight or volume, shall be rounded up to the nearest 0.1 g or 0.1 ml.

References

1. ^{{Citation|title=Directive 2009/34/EC of the European Parliament and of the Council of 23 April 2009 relating to common provisions for both measuring instruments and methods of metrological control (Recast) (Text with EEA relevance)|date=2009-04-28|url=http://data.europa.eu/eli/dir/2009/34/oj/eng|volume=OJ L|issue=32009L0034|language=en|access-date=2019-01-28}}

External links

Evertype article
Council Directive of 20 January 1976 on the approximation of the laws of the Member States relating to the making-up by weight or by volume of certain prepackaged products

2 : Symbols|EN standards

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