Average Quantity System

In 2015 APLMF agreed to summarise the test procedures used in each APLMF training course and then to survey its members to validate the test procedures and to provide some quality control. The validated test procedures will be later used to develop eLearning modules.

The summary test procedures are provided to guide economies wishing to follow OIML recommendations. They contain abbreviated terms and formulae which are defined in the relevant OIML recommendation.

Information relating to an Average quantity system:

SUMMARY OF TEST PROCEDURES USED FOR AN AVERAGE QUANTITY SYSTEM

These test procedures are based on OIML R87 (2017 version).

Test Name	Procedures Description
Define the inspection lot	Determine the inspection lot to be sampled using random sampling in accordance with Clause 4.4 of OIML R 87.
Determining the appropriate sample size	Determine a sample size appropriate for the inspection lot from Column 2 of Table 2 within OIML R 87.
Determining the appropriate sample size using the Stepwise sampling plan	Determine a sample size appropriate for the inspection lot from Annex H within OIML R 87.
Determine the appropriate T1 and T2 values	Determine the tolerable deficiency (T) appropriate for the nominal quantity of the prepackages, according to Clause 3.4 and Table 1 within OIML R 87.
Determine the number of prepackages allowed to exceed the tolerable deficiency	Determine the number of prepackages allowed to exceed the tolerable deficiency from Column 3 of Table 2 of OIML R 87.
Determine the average tare mass	Determine the Average Tare Mass (ATM) by using the procedures in Annex B of OIML R 87.
Determine the individual prepackage error	Determine the actual quantity of the product and subtract from it the nominal quantity (Qn) of product to calculate the individual prepackage error, as per Clause 2.1.2.2 of OIML R 87.
Determine if the test results meet the individual prepackage requirements	Compare each negative individual prepackage error obtained to the values for T. 1) Reject the lot if the number of prepackages having a T1 error is larger than the number in Column 3 of Table 2, as per 4.3.2 of OIML R 87, and / or 2) Reject the lot if the number of prepackages having a T2 error is larger than zero, as per 4.3.3 of OIML R 87, the sample fails.
Determine if the test results meet the average prepackage requirement	If the average actual quantity of all prepackages, after the Sample Correction Factor (SCF) (Column 4 of Table 2) is applied, is less than the nominal quantity of the prepackages being sampled, the sample fails (see 3.2 of OIML R 87)
Determine the number of pre-packages allowed to exceed the tolerable deficiency	Determine the number of pre-packages allowed to exceed the tolerable deficiency from column 3 of Table 2 of OIML R87.
Determine the average tare weight	Determine the average tare weight by using the procedures in Annex B of OIML R 87.
Determine the individual pre-package error	Determine the actual quantity of the product and subtract from it the nominal quantity (Qn) of product to calculate the individual pre-package error.

These test procedures are based on OIML R87 (2004 version).

Test Name	Procedures Description
Define the inspection lot	Determine the inspection lot to be sampled using random sampling in accordance with clause 4.2 within OIML R 87.
Determining the appropriate sample size	Determine a sample size appropriate for the inspection lot from column 1 of Table 1 within OIML R 87.
Determine the appropriate T1 and T2 values	Determine the tolerable deficiency (T) appropriate for the nominal quantity of the pre-packages according to 4.2.3 within OIML R 87.
Determine the number of pre-packages allowed to exceed the tolerable deficiency	Determine the number of pre-packages allowed to exceed the tolerable deficiency from column 4 of Table 1 of OIML R87.
Determine the average tare weight	Determine the average tare weight by using the procedures in Annex B of OIML R 87.
Determine the individual pre-package error	Determine the actual quantity of the product and subtract from it the nominal quantity (Qn) of product to calculate the individual pre-package error.
Determine if the test results meet the individual pre-package requirements	Compare each negative individual pre-package error obtained to the values for T. 1) If the number of inadequate pre-packages exceeds the total permitted in column 4 of Table 1 of OIML R 87, And / Or 2) If any inadequate pre-package with a negative individual pre-package error greater than T2 (see 2.4 of OIML R 87) is found, the sample fails
Determine if the test results meet the average pre-package requirement	If the average of all pre-package errors plus the Sample Error Limit (correction factor) is less than the nominal quantity of the pre-packages being sampled, the sample fails. (see 3.1 of OIML R 87)

SUMMARY OF ECONOMY REPORTS

MEDEA Project: Training Course on Pre-packaged Goods. Held in Nanning, PR China from 10-13 April 2018.

Summary of economy reports can be downloaded here.

SURVEY RESULTS ON ON PROVIDING BENCHMARK TEST PROCEDURES FOR PERFORMING AN AVERAGE QUANTITY SYSTEM INSPECTION

2018 Survey results can be downloaded here.

Previous Survey Results

Test name	Total economies surveyed	Adopted	Not implemented	Economies not responded
1.Define the inspection lot	19	14	1	4
2. Determining the appropriate sample size	19	13	2	4
3. Determine the appropriate T1 and T2 values	19	14	1	4
4. Determine the number of prepackages allowed to exceed the tolerable deficiency	19	13	2	4
5. Determine the average tare weight	19	14	2	4
6. Determine the individual prepackage error	19	15		4
7. Determine if the test results meet the individual prepackage requirements	19	14	1	4
8. Determine if the test results meet the average prepackage requirement	19	14	1	4

Economies responded
Australia, Canada, Cambodia, DPR of Korea, Hong Kong China, Indonesia, Japan, Malaysia, Mongolia, New Zealand, Papua New Guinea, Singapore, Chinese Taipei, Thailand, Vietnam

Economies not responded
China, Philippines, Republic of Korea, United States of America