Demonstration of Telecalibration capabilities as a new tool for metrology at the German Primary High Pressure Natural Gas Test Facility 'pigsar'

摘要

The paper demonstrates the telecalibration capabilities of pigsar, the national standard for natural gases at high pressure of Germany. The telecalibration tool was developed in order to give PTB an efficient access to the on-going calibrations at pigsar. It can be considered as a new tool for metrology to maintain and supervise the dissemination of the units volume and mass of natural gases under high pressures. Furthermore, telecalibration is a necessary tool and issue to provide for PTB-certificates based on the harmonized reference value for high-press natural gases as agreed between between NMI-VSL and PTB. After a short introduction explaining the metrological situation, an overview is given about the technology and features of the software. The telecalibration software used by PTB is identical to the software used at the national lab pigsar for the daily calibrations. Due to security and safety reasons, not all options and functions are available at PTB. The handling of the software is based on different software screens necessary to visualize the process of calibration and to supervise a gas meter under test respectively. The screens shown in the paper are test results of a "watch dog test" carried out to supervise the harmonization procedure of the natural gas cubic meter between PTB and NMi.