Repeatability Tests – Volumetric Meters

Repeatability Tests – Volumetric Meters (PDF, 34 KB, 2 pages)

The purpose of this information bulletin is to inform interested parties of Measurement Canada's (MC) intention to change guiding principle c) of the Standard Test Procedure (STP) in part 3, section 7 of the Field Inspection Manual – Volumetric Measuring Devices

Background

The current guiding principle whereby a repeatability test is to be done any time the difference between the fast run and the slow run exceeds the absolute value of the applicable limit of error (LOE) has been in place for several decades without any supporting rational or data. MC conducted a small study to determine if in fact the guiding principle was effective in screening for repeatability problems. The study found that if a repeatability test were only done when the conditions of the guiding principle suggested, the majority of problems would be missed.

Based on this study, MC had intended to make the full repeatability test part of all volumetric inspections; however, during the consultation process, the industry expressed significant concern. The primary concern was that the increase in work was not justified by the amount of problems disclosed. Contradictory evidence was also presented by some Authorized Service Providers.

Proposal

MC plans to revise the above-mentioned guiding principle to require a repeatability test be done any time the difference between the fast run and the slow run exceeds 2/5 of the applicable LOE. MC will study this matter further and base future changes on the results of this study.

This change would come into effect .

If you have any comments or concerns regarding this matter, please direct them to Dennis Beattie on or before .

Dennis Beattie
Senior Program Officer, Volume
Program Development Directorate
Measurement Canada
4th floor, 400 St. Mary Avenue
Winnipeg, MB R3C 4K5
Telephone: 204-983-8910
Fax: 204-983-5511