Force Accreditation

Morehouse facilities and procedures are subject to and are under continuous audit by, these government agencies and industrial organizations. Compliance through audits by accredited bodies such as A2LA, NVLAP, and NUPIC assures standardized methods and can reduce human error in measurement. Standards have existed for many years, and are continually evolving to standardize national and international operations for measurement and calibration services.

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NVLAP accreditation

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A2LA accreditation

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Morehouse Instrument Company force calibration facilities and procedures are documented in a controlled quality assurance program manual, with compliance to the requirements of the following:

Force Accreditation and Torque Accreditation

  • ISO/IEC 17025 – General requirements for the competence of calibration and testing laboratories. A2LA accredited, certificate #1398.01. NVLAP code 600259-0
  • ANSI/NCSL Z540.1 - Laboratories, Calibration, and Measuring and Test Equipment.
  • ANSI/NCSL Z540.3 - Requirements for the Calibration of Measuring and Test Equipment.
  • ISO 10012-1 Quality Assurance requirements for measuring equipment – Part 1: Metrological confirmation system for measuring equipment.
  • 10 CFR 50 APPENDIX B – Quality Assurance Criteria for Nuclear Power Plants and Fuel Reprocessing Plants.
  • 10 CFR PART 21 – United States Nuclear Regulatory Commission – Reporting of Defects and Noncompliance.
  • MIL-STD-45662A – Military Standard Calibration System Requirements- This standard was cancelled January 20, 1995 by the U.S. government but because we have customers using this Standard we provide for its requirements.
  • Other industrial and government specifications and customer specified requirements.

Our Commitment To Quality

The force and torque calibration laboratories at Morehouse are accredited for calibration to ISO/IEC 17025 and ANSI/NCSL Z540.3 by A2LA (Certificate Number: 1398.01), and NVLAP (code 6000259-0). This accreditation demonstrates technical competence in force and torque calibration and the operation of a laboratory quality management system. The force calibration laboratory and procedures are compliant with 10 CFR 50 Appendix B: United States Nuclear Regulatory Commission Quality Assurance Criteria for Nuclear Power Plants, 10 CFR Part 21: United States Nuclear Regulatory Commission Reporting of Defects and Noncompliance.

Morehouse Instrument Company is the only commercial laboratory offering force calibration through 120,000 lbf using deadweights certified by the United States National Institute of Standards and Technology (NIST), by direct comparison to national standards of mass. Weights have been corrected for gravity, material density and air density. Accounting for these variables Morehouse Instrument Company is able to offer force calibrations with an uncertainty of better than 0.002 % of applied force, through 120,000 lbf. ASTM E74 requires instruments used as secondary calibration standards to be calibrated by comparison with deadweights. Additionally, ASTM E74 requires the loading range not include forces less than the first non-zero point applied during calibration.

Morehouse Instrument Company follows the procedure and guidelines of ASTM E74 by applying 11 increasing forces with the first point being well below 10 % of capacity to ensure our customers ASTM Class A lower limits comply with ASTM E74. The first test point is the greater of 400 times the resolution for Class A, 2000 times the resolution for Class AA, or 2 % of the maximum applied force.

Morehouse provides force points below 10 %, so our customers can be compliant with the following ASTM E74 sections:

  • Section 7.2.1: “If the lower force limit of the verified range of forces of the force-measuring instrument (see 8.6.1) is anticipated to be less than one tenth of the maximum force applied during calibration, then forces should be applied at or below this lower force limit."
  • Section 7.2.1: “In no case should the smallest force applied be below the lower force limit of the force-measuring instrument as defined by the values: 400 x resolution for Class A verified range of forces  2000 x resolution for Class AA verified range of forces".
  • Section 8.6.2 of ASTM E74-18: "The verified range of forces shall not include forces outside the range of forces applied during the calibration. If the lower force limit is less than the lowest non-zero calibration force applied, then the lower force limit of the verified range of forces is equal to the lowest calibration force applied. "
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