S&T Committee

Specifications and Tolerances Committee

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The Specifications and Tolerances (S&T) Committee is dedicated to issues related to the design, testing, tolerances and user requirements for commercial weighing and measuring devices.  This broad scope includes scales, meters, measure containers, grain analyzers, taxi meters, timing devices, length measuring devices and more.  The standards adopted through the S&T Committee are published in Handbook 44 Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices .


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   Task Groups

 

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This task group submits its recommendations to the S&T Committee for consideration by the NCWM membership.

Due to a majority of the comments received during Open Hearings at the 2019 NCWM Interim Meeting related to the items contained in Block 1, Block 2, and the items GEN-3, LPG-3, MFM-5, and HGM-6, there is a desire to uniformly define what is considered a “standard” for tests in the field and to establish criteria for the standards not already addressed through the NIST 105 Series of handbooks.

Mission:

  • Find, examine, and develop a definition(s) for standards used in field testing
  • Make appropriate changes in Handbook 44 which may include:
    • replace the definition in Appendix D for transfer standard (if appropriate)
    • replace the term “master meter” in the definition of “master meter test method” (if appropriate)
    • replace references to transfer standards and/or other uses of terms in the handbook for standards used in field testing, with the new term(s) (if appropriate)
  • Work with the appropriate stakeholders to develop criteria to determine what is a suitable standard, which may include:
    • adding a statement to Handbook 44, Section 3.2., Fundamental Considerations to address another option for standard accuracy during testing, elaborate on traceability and how it is achieved, and language concerning regulatory responsibility similar to what is included in Handbook 130.

Goal:  Completion by July 2021.

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This task group submits its recommendations to the S&T Committee for consideration by the NCWM membership.

Mission:  Review Handbook 44, Section 2.20. Scales and relevant portions of OIML R76, using the items included in Block 2 as a reference, and recommend changes as necessary to:

  1. Clarify how error is determined in relation to the verification scale division (e) and the scale division (d).
  2. Clarify which is the proper reference, the verification scale division (e) or the scale division (d) throughout this section.
  3. Ensure proper selection of a scale in reference to the verification scale division (e) and the scale division (d).
  4. Clarify the relationship between the verification scale division (e) or the scale division (d).

The group should include: the submitter, Ross Andersen (retired), a regulator from each region, representatives from the scale industry, technical advisors from NIST and NTEP, and other interested stakeholders.

Goal:  Return the task group recommendations to the S&T Committee by November 15, 2023.

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Mission:  To review (possibly recommend) changes to the tolerances that appply to milk meters, which may include milk measuring systems in:

  • Section 3.31. Vehicle Tank Meters
  • Section 3.35. Milk Meters
  • Section 3.37. Mass Flow Meters
  • Section 4.42. Farm Milk Tanks

The task group will consider the tolerances proposed by the S&T Committee Item VTM-20.2. and the tolerances in OIML R 117-2 in their discussions.

The group should include a regulator from each region, technical advisors from NIST and NTEP, the submitters from POUL TARP A/S and Piper Systems Limited and may include other meter manufacturers, industry stakeholders (producers and processors), and other interested parties.

Goal:  Return task group recommendations to the S&T Committee by November 15, 2023.