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Calibration


The Norbar Torque Wrench Calibrator can help companies to ensure calibration certainty day-to-day


Revisiting BS EN ISO 6789:2017


It has been over a year since the revised BS EN ISO 6789:2017 standard was released. With this in mind, Philip Brodey, sales director at Norbar Torque Tools, the first laboratory in the world to be accredited to perform hand torque calibrations to the standard, explores the key changes, and also some of the challenges these have brought


testing, quality conformance testing and recalibration. The intention was to allow different groups of users to identify the relevant clauses to meet their needs. Taking this logic even further, the 2017 edition divides the standard into two distinct parts. As a rule, Part 1 relates to manufacture and conformance, and Part 2 focuses on the calibration of torque tools. For Par t 1, most of the requirements from


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the 2003 edition are carried over, but there are new design and quality conformance requirements to be aware of. Manufacturers will now need to state that the tools adhere to these requirements by supplying a “Declaration of Conformance”, which will typically include actual readings taken from the tool during its manufacture or subsequent re- testing. Most torque wrench manufacturers and test houses would previously have called such a document a “Calibration Cer tificate” however, under the 2017 version of the standard, this is no longer the case. Instead, Par t 2 defines the requirements for the calibration of torque tools, including the


Instrumentation Monthly January 2019


Continued on page 20... 19


reviously, the BS EN ISO 6789:2003 divided the requirements into three sections: design conformance


establishment of uncer tainty budget. Should a manufacturer therefore also wish to produce a Calibration Cer tificate, they must issue it in accordance with Par t 2 of the standard and the conditions that go with it. This means for torque wrench users there is


Philip Brodey, sales director at Norbar


now a choice; will they accept a “Declaration of Conformance” produced under Part 1 of the standard, or do they require a “Calibration Certificate” from Part 2 and the greater level of confidence in the torque wrench evaluation process that this should bring?


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