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  • Training

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
Picture
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
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The Asia-Pacific Legal Metrology Forum APLMF is a grouping of legal metrology authorities, whose objective is the development of legal metrology and the promotion of free and open trade in the region through the harmonisation and removal of technical or administrative barriers to trade in the field of legal metrology.
APLMF 2004-2015
  • About APLMF
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  • Metrology Basics
    • What is Metrology
    • ​​International & Regional Metrology Organisations
  • Training & Development
    • Training Overview
    • MEDEA Training Programme >
      • MEDEA 1 (2013 to 2018) >
        • Prepackaged Goods, Nanning China, April 2018
      • MEDEA 2 (May 2018 to 2021)
      • MEDEA 3 (May 2021 to 2024)
    • Training Videos
    • Active Working Groups Overview >
      • Goods Packed by Measure
      • Metrological Control Systems >
        • Sub Working Group on Digitalization in Metrology (SWG-DM)
      • OIML Certificate Systems
      • Quality Measurement of Agricultural Products
      • Weighing Instruments
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      • Medical Measurement
      • Measurement of Fuels
    • Subject Matter Experts
    • Disbanded Working Groups Overview >
      • Medical Measurements
      • Mutual Recognition Arrangements
      • Training
  • News & Publications
    • APLMF Guides >
      • Guide Test Procedures >
        • Average Quantity System
        • Bulk flowmeters
        • CNG Dispensers
        • Domestic water meters
        • Fuel Dispensers
        • Non-automatic weighing instruments
        • Non-automatic weighing instruments including substitution
        • Rice Moisture Meters
        • Taxi Meters
        • Electricity Meters
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      • 28th Report Approval Voting
      • 2021 Financial Report (Jan-Dec) Approval Voting
      • 2022 MOU and Rules Voting
      • 27th Report Approval Voting
      • 26th Minutes Approval Voting
      • 2021-25 Strategic Plan Approval Voting
      • 2019 Financial Report Approval Voting
      • 25th Minutes Approval Voting
      • 2018 Financial Report Approval Voting
      • 2019 MOU with PTB Voting
      • 2019 Executive Committee Appointment - Vote
    • ​​Working Group Area >
      • Goods Packed by Measure Documents under Development
      • QMAP Documents under Development
      • Utility Measures Documents under Development
      • Metrological Control Systems Documents under Development
    • Training Resources >
      • Grain Moisture Measurement
      • Fuel Dispensers
      • Taxi Meters
      • Weighing Instruments
  • Training