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M-06 (rev. 1) Metric Conversion of Weighing Devices
PDF Format | Table of Contents Date: 1998-03-02 1. This bulletin addresses the metric conversion of weighing devices and applies to all devices that are approved to register only in Canadian units of measurement . It sets out acceptable methods of conversion based on the requirements of sections 66, 121 and 126 of the Weights and Measures Regulations as well as sections 30 and 34 of the Specifications Relating to Non-Automatic Weighing Devices. 2. Section 9 of the Weights and Measures Regulations provides for the modification of approved devices, to enable them to measure in metric units, if such modifications conform to the applicable requirements established by the Regulations and the Specifications. 3. A scale that is modified to measure in terms of metric units shall not have a metric capacity greater than 111% of the approved capacity in Canadian units. For example, a scale with an approved capacity of 100 000 pounds would normally be converted to 50 000 kilograms. 4. When a scale is converted to measure in metric units by replacing an indicating mechanism that includes a non-computing dial, a cylindrical or fan chart, all or part of a beam, or a tip weight, the replacement indicating mechanism and any other component parts required to make the replacement indicator compatible to the scale:
5. It is recommended that replacement indicating mechanisms that compute monetary values be submitted to Measurement Canada for examination in order to ensure that they conform to applicable requirements. 6. When an insert is installed to convert a beam to measure in metric units where there was not an insert before, the beam shall be suitably altered to install the insert, and the insert shall be of good and permanent quality with a minimum thickness of 1.5 millimetres. 7. Subject to section 172 of the Regulations, Ministerial Specification SGM 3, subsections 15.3 and 15.4, and except as may otherwise be allowed by a Notice of Approval, the maximum value of the finest graduation or increment that is permissible when a scale is modified to measure in terms of metric units is set out in the following table (applies to previously inspected or newly manufactured scales):
Note 1: Conversion charts or weight bands for computing cylinder scales need not have a minimum graduation of less than 20 grams. Note 2: Retail counter scales with 0.01 pound increments need not have a finest increment smaller than 10 grams following metric conversion. 8. A scale with a full capacity dial may be converted to measure in terms of both metric and Canadian units of measure (dual indication).
9. A scale with a dial and tare bar(s) may be modified to measure in terms of both metric and Canadian units of measure when:
10. All dial scales that are not modified in this manner shall be converted such that all means of indication are in terms of metric units only; this includes charts, tare bars and drop weights. 11. Within 5 days of conversion, the person who alters a scale to indicate in terms of metric units shall report the conversion to the nearest Measurement Canada office as required by section 41 of the Regulations. 12. The nameplate of a scale that has been converted to metric must be modified to indicate the conversion. 13. The identification markings may be made on a subsidiary to the original nameplate or on a replacement nameplate. 14. In the case of a scale that is modified by replacing the indicating mechanism, the scale shall be marked with all the information on the original nameplate, as well as:
15. The pinning of beams at half their capacity for the purposes of converting weighing devices to the metric system is prohibited. 16. REVISION: The purpose of this revision is to:
17. For additional information, please contact:
Jeff Watters |
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Created: 2003-07-08 Updated: 2005-01-26 ![]() |
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