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The calibration of your measurement instruments serves to tie into the international system of units and to ensure the traceability of your measurement output. LNE proposes performing calibration on-site at your premises to minimize the idle time of equipment and installations, as well as to operate on stationary systems that cannot be moved.
Presentation of potential services
On-site calibration of pressure measurement chains, manometers and barometers:
Calibration consists of determining the corrections to be applied to instrument readings at different pressure levels. This calibration operation is carried out according to one of two protocols: 1) 6 points spaced along the pressure rise-drop range, with one repeatability point (generally at mid-range); or 2) 11 points spaced along the pressure rise-drop range, with 3 repeatability points (typically at 25%, 50% and 75% over the full scale).
The expanded uncertainty values provided below assume an expansion coefficient of k=2.
The following values do not take into account uncertainties correlated with the calibrated instrument (notably the display resolution). As per COFRAC's LAB GTA 11 edict, final expanded uncertainties may not exceed 0.2% of the measurement range for the instrument undergoing calibration.
For any uncertainty request more refined than 0.2% of the instrument measurement range, we propose a method based on a full pressure rise-drop cycle calibration, with 11 points spaced along the measurement range with repeatability at 3 points during the cycle rise and repeated 3 times. In this case, the expanded uncertainties may not exceed 0.05% of the measurement range.
Accreditation details
Services backed by COFRAC Accreditation 2-1653.
Detailed accounts of uncertainties may be consulted in the Technical Appendix of the Accreditation scope, available on the COFRAC website.
