Calibration
Setting common StandardS in force calibration preciSion
Traceable reference measurement instruments used in accredited calibration laboratories must meet the highest requirements in terms of precision, reliability and quality. To this effect, system specialist FORM + TEST Seidner & Co. relies on Hottinger Brüel & Kjær’s (HBK) dependable and high-precision measurement technology in its ALPHA 2-5000 S compression testing machine for the calibration of force sensors at a calibration laboratory in Singapore.
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national metrological institute of the Republic of Singapore has a calibration laboratory that guarantees maximum measurement accuracy. It offers its
customers calibration with test loads of up to 5,000kN – including the calibration of force sensors. The ALPHA 2-5000 S compression testing machine, developed by FORM + TEST Prüfsysteme, is a device for use in laboratories. Its test force of 5,000kN for static compression tests enables the calibration of highly precise measurement systems. It has been used for the first time at the Darmstadt Technical University competence centre for calibration.
ALPHA 2-5000 S PROvidES HigHLy ACCuRATE RESuLTS FORM + TEST Seidner & Co. had the necessary expertise to implement the highly precise special solution required to perform the calibrations as requested by the renowned calibration laboratory in Singapore. Therefore, the experts for high-quality material testing machines and testing systems from Riedlingen in Germany ventured into the development of the measurement device for static compression tests. FORM + TEST’s tried and tested compressive force testing machines form the basis of the customised solution, ALPHA 2-5000 S. The up-to-date, high-precision Alpha 2-5000
S reliably delivers the desired results in the national calibration laboratory of the Republic of Singapore. It guarantees precise calibration of force sensors as well as continuous calibrations in the compressive direction. The measurement system can also cope with the additional requirement of measuring very small force values. The ALPHA 2-5000 S can, therefore, be used with a maximum precision of up to one per cent of its maximum load. Due to its special features, such as a special, high-precision test cylinder, the ALPHA 2-5000 S provides peak performance in terms of precision and reliability. The cylinder’s virtually friction-free bearings and its lateral guide ensure an optimal application of force. Furthermore, the compression testing machine is characterised by
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the high stiffness of its frame, precise control accuracy due to the DIGIMAXX C30 controller, and a special software interface for automatic calibration procedures.
FORM + TEST PRüFSySTEME RELiES On guARAnTEEd PRECiSiOn By HBK FORM + TEST relied on measurement technology from HBK for the implementation of its ALPHA 2-5000 S compressive testing machine. In addition to positive experiences in the past, the company’s reputation was also crucial to the decision to use solutions from the measurement technology experts. However, the key factor in favour of HBK was the fact that HBK could guarantee the precision and reliability of its products and the entire measurement chain – making it the only partner eligible for the project. The central element of the measurement
system is a custom-built system, BU18, with three C18 reference force transducers from HBK. In addition, three C15 reference force transducers from HBK, with a 5 kN, 100 kN and 500 kN measurement range, were integrated into the system for high-precision force measurement. These robust (EMC-tested, stainless-steel, shock and vibration-tested) shear force sensors with nominal measuring ranges between 2.5 kN and 1MN meet the requirements of accuracy class 00 according to DIN EN ISO 376 in the exceptionally broad measurement range of 10 to 100 per cent of the respective capacity. Due to the required high accuracy, the BU18 was calibrated at the German National Metrology Institute, PTB, in Braunschweig. HBK’s build-up system, which was customised for the ALPHA 2-5000 S, perfectly met the accuracy class 00 according to DIN EN ISO 376. This result could be achieved not least due to the excellent cooperation between HBK and FORM + TEST in the run-up to the calibration, in which the transducer was preloaded with 120 per cent of its capacity by FORM + TEST as prescribed by PTB. A DAkkS calibration of the BU18 had been performed in HBK’s accredited calibration laboratory in advance. Traceability of the calibration to the National Standard (PTB) has, therefore, been ensured. The DMP41 reference measuring amplifier
completes the measurement system. With its unique accuracy class of 0.0005, the high- precision measuring instrument is the most accurate amplifier for strain-gauge-based measurements worldwide. As a result, HBK’s DMP41 was the first choice for implementing the ALPHA 2-5000.
An ExCEPTiOnAL CHALLEngE MASTEREd wiTH COnFidEnCE With its ALPHA 2-5000 S, FORM + TEST Seidner & Co. has created a force calibration machine that is unique in terms of its functionality, load capacity, and precision. The cooperation with HBK was key to this success. On the one hand, the reliable and perfectly
matched measurement technology from the Darmstadt experts delivers the required precise results, which HBK, as the only provider, was able to guarantee. On the other hand, the mutual appreciation
and recognition of existing knowledge as well as the cooperation in a partnership were further decisive factors contributing to the joint success of the project.
HBK
www.hbkworld.com January 2022 Instrumentation Monthly
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