NGV Project Utilises Mettler Toledo Systems

Leading the development of a distribution network of natural gas for vehicles (NGV) in Switzerland, Apex is providing consulting services, NGV refuelling equipment and maintenance services. For the planned verification and calibration of a refuelling station, Apex founder and general manager Ueli Oester relies on Mettler Toledo rugged high-accuracy instruments. One important service provided by Apex is the verification and calibration of dispensing systems to bring them in conformity with national weights and measures legislation.

The flow of gas dispensed to a car is measured using the Coriolis principle. Bringing the measurements of a mass flow meter in compliance with national and international standards requires a high-accuracy scale and a set of approved calibration weights. The Apex service trailer contains three gas bottles made of composite material, a KB60 scale and a Mettler Toledo IND429 display unit. Beginning with the verification process, the weights and measures officer verifies the KB60 using his own set of OIML/NTEP weights. He verifies the scale regularly according to a procedure responding to the GWP guideline recently introduced by Mettler Toledo.

The verification of the NGV dispensing system consists of two complete and one partial bottle filling. Once filled, the value displayed at the dispenser is noted. The bottle is placed on a small hand cart and transported to the scale that Ueli Oester installed nearby. Moving the filled bottle (60kg) from the cart to the scale causes mechanical constraints that the scale is able to withstand. However, particularly when an instrument is submitted to varying conditions of usage or mechanical constraints, it is important to verify it on a regular basis.

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