CERIB’s laboratory has Cofrac calibration accreditation No. 2.1161 for calibration of weighing instruments (not subject to legal metrology) and standard weights by means of double weighing.
(scope available at www.cofrac.fr)
CERIB bases its weighing on COFRAC document LAB GTA 95 which defines the principle of calibration and gives recommendations for assessing the associated calibration uncertainty.
Users can then use the appendix to the guide document to in turn propagate the components of uncertainty associated with their applications and assess an uncertainty for their weighing.
Calibration of a weighing instrument consists in quantifying its main metrological characteristics: resolution / indication error / repeatability error / offset error.
Range covered:
- • from 1g to 3,000 kg with weights
• up to 6,000 kg with Leviatys®.
For weighing, the services offered concern NAWIs (non-automatic weighing instruments).
Non-automatic weighing instruments (NAWI) (NF EN 45501):
Instruments that require the intervention of an operator during the weighing process, for the placement or removal of loads to be weighed on the load receptor and for obtaining the result, for instance.
These instruments can be laboratory balances for ranges less than 60 kg and belt weighers, floor scales, weighbridges, etc. for heavier loads in production processes.
– standard weights
– laboratory balances
– on-site floor scales, weighbridges, etc., belt weighers.
Technical equipment used by our metrology teams:
- mass comparators: from 220 g to 31 kg.
NB: For heavy-duty weighing instruments CERIB proposes the Leviatys® method, the principle of which is to exert counter-thrust against a weighing system by means of jacks.
Calibration then compares the reading of load cells on the jacks (cumulative reading) with the reading of the scales.