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Net Weight Variance


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#1 pghosh

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Posted 11 December 2017 - 09:12 PM

Hello,

 

We have an inline check-weigher that rejects finished product outside the MAV, but was wondering if there was a percentage of net weight failure (including the lower and upper MAV) on a given lot, that is considered acceptable.

 

Thank you.

 

Piki


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#2 Sharon (Dewsbury)

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Posted 14 December 2017 - 11:39 AM

In the UK we use these regs.(see attached, Annenex 1)  I suppose there will be some similar regs in the USA. We call it the 3 packers rules.

In a nut shell.

1. None below the average

2. T1 can be up to 2.5% max.

3. No T2 are accepted.

See the attachments , but this is UK so check yours out locally.

 

 

Attached Files


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#3 ChrisZ

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Posted 14 December 2017 - 11:55 AM

For the USA I would suggest to look into the guidelines by the National Institute of Standards and Technology (NIST) regarding MAV.

 

(1)  Batch Average

 

The average net product weight of the packages in each finished product batch must equal or exceed the labeled net weight.

 

(2)  Individual Package

 

The variation of individual package contents from the labeled quantity must not be “unreasonably large”.  The variation between individual package weights with any given batch must not exceed a specified range depending on the net weight claimed on the package. 

 

The Maximum Allowable Variation (MAV) is the limit of “reasonable Variation” for an individual package base on the NIST Handbook 133.  For determining the MAV for each package size reference Table 2-5 in Appendix A of NIST Handbook 133 - 2013 Editionhttp://www.nist.gov/...bs/hb133-13.cfm.

 

Example: Based on Table 2-5, a 20 Kg (44 lbs.) bag has an MAV or +/- 226 g (0.50 lbs.)

 

Local Work Instructions should provide the MAV for each package size filled at that location.


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