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| Force
Accredited metrological sector
Sector Manager: Andrea Somaschi
Leonardo da Vinci Campus
Piazza Leonardo da Vinci, 32
20133 - Milan
Telefono: 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
TEST MACHINES
|
Instruments in calibration |
Measuring |
Calibration |
Condition |
Measuring range |
Uncertainty |
Method/Procedure |
|
Metallic material test machines1 |
Force |
|
Compression |
from2N to 5000 kN |
0,16% |
UNI EN ISO 7500-1:2018 |
|
Traction |
from 2N to 1000 kN |
0,16% |
||||
|
Concrete material test machines1 |
|
Compression |
from 2N to 5000 kN |
0,16% |
||
|
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
TEST EQUIPMENT FOR TENSILE/COMPRESSION FORCE MEASUREMENT OF CONSTRUCTION MATERIALS
| Instruments in calibration | Measuring | Calibration | Condition | Measuring range | Uncertainty | Method/Procedure |
| Test equipment for force measurement1 | Force |  |
Compression | from 2N to 5000 kN | 0,16% | UNI EN ISO 7500-1:2018 |
| Traction | from 2N to 1000 kN | 0,16% | ||||
| Certificate delivery time: 20 working days from the execution of the measurements | ||||||
1) Relating to: presses for tests on earth and bitumen; presses for CBR (California Bearing Ratio) tests; presses for Marshall tests; presses for triaxial tests; presses for ELL tests (Free Lateral Expansion); pull out; plate holder; hydraulic jacks.
DYNAMOMETERS FOR CALIBRATION
| Instruments in calibration | Measuring |
Calibration |
Condition |
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 |
Class 1 |
UNI EN ISO 7500-1:2018 |
|
from 50N to 5000 kN |
Class 1 |
|||||
|
|
Compression Traction (taratura in sito) |
from 2N to 50 kN |
Class 1 |
|||
|
from 50N to 5000 kN |
Class 1 |
|||||
|
Certificate delivery time: 20 working days from the execution of the measurements |
||||||
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
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 |
