I think I have a minor issue with the few meter on mY PP164. I can set the flow rate and the ball indicator floats just fine.
When the flow stops, the ball falls as expected. So far so good.
However, when the gas starts flowing again, the ball indicator stays put at the bottom of the flow gauge. The gas is flowing, but doesn't register on the flow meter.
If I increase the flow rate slightly, the ball will jump up, but the whole process starts over again.... gas stops, ball falls and stays down even when gas flow resumes.
It's almost like the ball or seat is dirty. Can it be disassembled and cleaned?