SA3 GATT has trouble in setting the pressure at ~0.5mbar. setting any value between 0.5 and 0.6 will have it settle around 0.48.

It turns out the GATT cannot tune the pressure between 0.48 and 0.62mbar. tuning pressure continuously to keep transmission constant gets us in the need of that range eventually. the problem is that at 0.48mbar the valve V30740S is at 100%. the minimum opening of the next valve V307030S gets already 0.62mbar.

[edit simon, after talking Michaela]

we had the idea that one could use two of the MFCs (M.R.+L.R.) at the same time to extend the range of the low end. Indeed this does work but one has to make sure that Set Control Mode is 1! (att 1)

This, at least gives us a upper limit of the low range of 0.52 mBar (mind you, this is only for manual settings, parallel operation of MFCs is not forseen so far by the software)

Set Control Mode to 1 on U.R. MFC gives us a low end of 0.56 mBar on the upper range