Sorry for late reply, Yesterday I'm support outside. For the prove mass meter system is already use to test mass flow meter since end of September.
Yesterday SUK and WNP test it again and they has report as attach file krup.
The prove mass flow meter has some problem at inlet valve ( little leak ). It not effect to accuracy of the system, But it not credible when customer found.
I will check and solve this problem. If can't solve,We will prepare technical data for support this issue when customer visit krup.