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| Force
Sector Manager: Andrea Somaschi
Campus Leonardo da Vinci
Piazza Leonardo da Vinci, 32
20133 - Milano
Telephone: 02.2399.4259
Mail: taratura@polimi.it
The sector calibrates the force measurement system of single-axis static test machines, used for tensile and compression tests in accordance with the reference standard UNI EN ISO 7500-1, and of machines used for compression tests on concrete (commonly defined presses) in accordance with the reference standards UNI EN 12390-4 appendix B and UNI EN ISO 7005-1 appendix B.
In addition, the sector performs the calibration of force measuring instruments used as test equipment:
- Transportable hydraulic jacks consisting of a hydraulic piston, pump (manual or electro-hydraulic), and a measurement system, generally a pressure gauge or pressure transducer.
- Uniaxial static testing machines with force indicator not in engineering units but in pressure units/electrical units, or equipped with torque rings (removable or integral to the test equipment and therefore cannot be calibrated separately from the test equipment).
The measurement system can be calibrated partially in accordance with the UNI EN ISO 7500-1 standard.
Together with the Accredia calibrations, the laboratory carries out calibrations whose metrological traceability is guaranteed by the Politecnico Quality Assurance System:
dynamometers for calibration
industrial load cells
weighing scales
intermediate checks
ESTENSIMETRI - TRASDUTTORI DI SPOSTAMENTO
| Instruments in calibration | Measuring | Calibration | Conditions | Measuring range | Uncertainty | Method/Procedure | |
| Estensimetri a contatto | Spostamento - Deformazione | |
Base di misura: da 10 mm a 600 mm |
≥ 0,025 mm | ≤ 1 mm | 0,5 μm | UNI EN ISO 9513:2013 |
| > 1 mm |
≤ 50 mm |
0,06% | |||||
| Sistemi di misura in macchine di prova | Spostamento della traversa | |
Compressione / Trazione | ≥ 2 mm | ≤ 1000 mm | 0,2 % |
UNI EN ISO 9513:2013 Annex H |
Certificate delivery time: 20 working days from the execution of the measurements
TRASDUTTORI DI SPOSTAMENTO PER VELOCITA'
| Instruments in calibration | Measuring | Calibration | Conditions | Measuring range | Uncertainty | Method/Procedure | |
| Sistemi di misura in macchine di prova | Velocità della traversa | |
Compressione / Trazione | ≥ 1 mm/min | ≤ 500 mm/min | 0,22% | ASTM E2658-15(2023) |
Certificate delivery time: 20 working days from the execution of the measurements
DYNAMOMETERS FOR CALIBRATION
| Instruments in calibration | Measuring | Calibration | Conditions | Measuring range | Uncertainty | Method/Procedure |
| Dynamometers for calibration | Force |  |
Compression | from 2N to 50 kN | Classe 1 | ISO 376:2011 |
| from 50 KN to 5000 kN | Classe 1 |
Certificate delivery time: 20 working days from the execution of the measurements
INDUSTRIAL LOAD CELLS
| Instruments in calibration | Measuring | Calibration | Conditions | Measuring range | Uncertainty |
Method/Procedure |
| Industrial load cells1 2 | Force | |
Compression - Traction (taratura in sede) |
from 2N to 50 kN | Classe 1 | UNI EN ISO 7500-1:2018 |
| from 50N to 5000 kN | Classe 1 | |||||
|
Compression - Traction (taratura in sito) |
from 2N to 50 kN | Classe 1 | |||
| from 50N to 5000 kN | Classe 1 | |||||
|
1) For industrial load cells, the dynamometers used to perform calibrations are excluded 2) For tensile load cells, the measuring range is to be considered from 1 N to 1000kN |
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Certificate delivery time: 20 working days from the execution of the measurements
INTERMEDIATE CHECKS
| Instruments in calibration | Measuring | Calibration | Conditions | Measuring range | Uncertainty | Method/Procedure |
| Intermediate checks | Force | |
Material test machines |
(Compression ) from 2N to 5000 kN (Traction) from 2N to 1000 kN |
n.a. | UNI EN ISO 7500-1:2018 |
| Building material presses | ||||||
| Hydraulic jacks | ||||||
| Torque rings | ||||||
| Load cells > 5 kN | ||||||
| Load cells < 5 kN (only on site) | ||||||
| Additional numerical indicator for the machine and/or press |
Certificate delivery time: 20 working days from the execution of the measurements
WEIGHING SCALES
| Instruments in calibration | Measuring | Calibration | Conditions | Measuring range | Uncertainty | Method/Procedure |
| Weighing scales | Weight | |
CTP/PO.97.001 | from 1g to 40kg | Maximun 30g | Internal method. Calibration by direct comparison with sample weight |
Certificate delivery time: 20 working days from the execution of the measurements
1) For machines equipped with both analogue and digital indicators, the additional calibration with digital indicator requires the issuance of an additional calibration certificate
2) For industrial load cells, the dynamometers used to perform calibrations are excluded
3) For tensile load cells, the measuring range is to be considered from 1 N to 1000kN
