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Gibitre Instruments' metrology laboratory has been accredited as an Accredia Calibration Laboratory (LAT 00455) since 2005.
The calibration center complies with the ISO 17025:2018 standard.
The center is currently accredited for the calibration of:
- IRHD (Micro, Normal, Hard, Low) hardness testers according to ISO 48-9
- Shore hardness testers (A and D) according to ISO 48-9 and ISO 868
- Dynamometers - Force according to ISO 7500-1
- Dynamometers - Elongation according to ISO 9513 and ISO 5893
- Dynamometers - Speed according to ISO 5893 and ASTM E2658.
Gibitre Instruments' metrology laboratory has been accredited as an Accredia Calibration Laboratory (LAT 00455) since 2005.
The calibration center complies with the ISO 17025:2018 standard.
The center is currently accredited for the calibration of:
- IRHD (Micro, Normal, Hard, Low) hardness testers according to ISO 48-9
- Shore hardness testers (A and D) according to ISO 48-9 and ISO 868
- Dynamometers - Force according to ISO 7500-1
- Dynamometers - Elongation according to ISO 9513 and ISO 5893
- Dynamometers - Speed according to ISO 5893 and ASTM E2658.
Accredia calibration of:
• Force applied in Traction and Compression up to 20 kN
• Deformation (Strain gauges) between 10 and 1000 mm
• Crosshead displacement between 0 and 1500 mm
• Crosshead displacement speed between 0.1 and 1000 mm/min.
Calibration can be carried out at Gibitre headquarters and at the customer's laboratory.
Accredia calibrations of force and displacement measurements are carried out according to Technical Procedures approved by ACCREDIA.
Calibration activities are preceded by measurement of the laboratory temperature (which must be within the limits required by the standards and specified in the Accreditation Table) and verification that the instrument is functioning properly.
Next:
- Force measurements are made by comparing the load cell measurements of the instrument being calibrated with those obtained with the reference instrument. The comparison is repeated 3 times for each expected measurement scale
- Measurements for strain gauge differential elongation, crosshead displacement, velocity and reference length (initial strain gauge distance) are made by comparing the reading of the instrumentin calibration with those obtained with the Optical Line and reference chronometer.
Upon completion, calibration certificates are issued that include all measurements taken, calculation of the uncertainty of the measurements, and analysis of the conformity of the results with the respective reference standards.
The metrological laboratory of Gibitre Instruments has developed technical procedures and fastening devices for ACCREDIA calibration of IRHD and Shore durometers produced by all the major world producers.
Calibrations are performed in the metrology room of Gibitre Instruments, with controlled environmental conditions.
The Calibration of Hasrdness testers produced by Gibitre can be performed at customer site.
Accredia calibration for each type of durometer is carried out according to the relevant Technical Procedure approved by ACCREDIA and which includes all the measures required by the reference standards.
The calibration involves the following steps:
• Minimum thermal conditioning of 4 hours at controlled temperature and humidity.
• Functional verification and verification of the pre-calibration reading of the instrument with comparison samples.
• Possible adjustment of the instrument
• Dimensional Calibration of the Indentor and of the Anular Foot
• Calibration of Forces applied by the Indentor and by the Anular Foot
• Calibration of the Displacement of the Indentor
• Calibration of the time of duration of the test
• Verification of the post-calibration reading of the instrument with comparison samples.
• Preparation of the Accredia Calibration Certificate which shows all the measures described above.
At the end, the instrument is packed for the shipment.
• If, during calibration, all the characteristics of the instrument are found to be in conformity with respect to what is required by the reference standard, the Declaration of Conformity of the instrument is recorded in the Calibration Certificate, certifying its full conformity for use.
• In the case of calibrations performed at Gibitre's facility, and the instrument does not function properly or cannot be adjusted to achieve full compliance with the requirements of the reference standard, the calibration is discontinued and the instrument is returned without charge.
• In the case of calibrations carried out at the customer's site, if the instrument does not function properly or if the environmental conditions are not within the limits prescribed by the reference standards, the calibration is discontinued and the customer is charged only for the costs related to the technician's travel.
The calibrations allow you to determine the error of indication of instruments in order to ensure more precise and reliable measurement results.
The calibrations are carried out by comparing the indication of the instrument with the measurement of corresponding known values with the relative uncertainties.
The calibration process of instruments and samples by laboratories accredited according to ISO / IEC 17025 consists in the comparison with a higher level reference sample and thus allows the measurements they produce to acquire the metrological traceability to national or international samples.
Calibration is necessary for the compliance of a measuring equipment with the requirements for their use.
Normally, equipment calibration is performed:
• Before they are put into service;
• When adjustments or repairs are made;
• If foreseen by the contract with the client, before and after the setting up.
The outcome of the calibration is reported on the calibration certificate issued at the end of the activity.
The accreditation of the laboratories that perform the calibrations ensures the metrological traceability of national or international samples over time.
The ultimate goal is to reduce the margins of error for achieving more precise and reliable measurements.
Accreditation ensures that the calibration laboratory has all the requirements required by the standards for carrying out conformity assessment activities.
Accreditation is the certification, by an entity acting as super partes guarantor, of the calibration laboratory's competence, independence and impartiality.
The accreditation of the laboratory confers on the calibration certificates issued on the market, a high degree of reliability in terms of quality and safety of the instruments subjected to verification, and guarantees their recognition on international markets.
Worldwide, accreditation is carried out on the basis of the international standard ISO / IEC 17011. Within the European Union, the European Regulation 765/2008 provides that each member state appoints its own unique national accreditation body and has conferred for the first time to this activity a legal status, recognizing it as an expression of public authority.
In Italy, the single accreditation body designated by the government is Accredia.
Accredia is a member of the international networks of the accreditation bodies and is the signatory of the relevant international mutual recognition agreements, thanks to the passing of a peer evaluation process.
Gibitre has a solid experience regarding the manipulation and calibration of hardness testers and has performed more that 1500 calibration since 2005.
The measurements made with the instrument before any adjustment and calibration operations and any variations with the pre-calibration conditions are recorded.
By pre-arranging the delivery date of the instruments with the Gibitre sales office, we can perform the back-shipment of the instrument within 24 hours from delivery.
Instruments that do not meet the Accredia calibration requirements are returned without charging calibration service.
