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Calibration


it takes a considerable amount of time to gather the readings that are now required to build an uncer tainty budget. For ISO 6789:2003 only 20 actuations were required, but for ISO 6789-2:2017 the minimum amount of readings is 59 (where there is no adaptor and no ratchet) or up to a maximum of 139 (where both an adaptor and ratchet are present). This has meant that the average calibration time has increased on average by 2.5 times that of the original time taken. The question therefore is how does a laboratory recover the cost of this additional time when they are competing with other businesses who are not adhering to the latest version of the standard.


the solution?


What have the challenges been?


From April 2019, all UKAS accredited laboratories will have to be ISO 6789-2:2017 compliant or they will not be allowed to perform calibrations. However, one of the key challenges currently faced is that despite not


The Norbar Torque Wrench Calibrator is designed to perform accurate calibrations of Click, Cam, Dial and Electronic torque wrench designs


making it known to their customers, many providers are not offering the same service. In fact, many laboratories and torque wrench repair companies are continuing to call the document they produce a “Calibration Cer tificate”, even if it would not be regarded as such under the new standard. It may not necessarily be that these companies are trying to be deceitful as they could be mistakenly working to an earlier, now obsolete, issue of the standard, however, the problem is that many customers will not understand the distinction. In addition, even those that claim they are working to Par t 1 and/ or Par t 2 of the revised standard may not be and because the standard is still relatively new, internationally there is a shor tage of auditors to monitor and check this. Another challenge is that


The answer therefore has to be to educate customers about the difference and the impor tance of working with those that are compliant with the new standard. Some may see it purely as a piece of paper on file, or a price hike, but most customers will care that the calibration of their torque tools is done correctly and that a ‘calibration’ truly is a ‘calibration’. Operators in the Norbar laboratory are able to calibrate all makes of torque wrenches and screwdrivers within its scope of UKAS accreditation from 0.1 N•m to 3,000 N•m with the lowest uncer tainty of 0.17 per cent, the lowest uncer tainty currently available in the UK. In addition, for customers and laboratories


wanting to perform their own calibration to the standard, Norbar’s latest Torque Wrench Calibrator Auto (TWC Auto) can help. The system enables accurate and efficient testing and calibrations of click, dial and electronic torque wrench designs in accordance to the ISO 6789:2017 and can calculate the uncertainty figure, while also boasting a calibration job management system for booking calibrations and recording the progress of previous jobs. This has the potential to save businesses time and ultimately money in the long run – helping to ensure calibration certainty day-to-day.


Norbar Torque Tools www.norbar.com


20


January 2019 Instrumentation Monthly


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