@Doubletop Thanks for that.
I haven't range limited the readings on this version (ie ignore bad results) but do check for two consecutive readings, thus far no bogus readings recorded.
In my own case, the 3v node had no spare pins, so had to expand anyway to avoid using to a second dedicated node.
Having read on the 5v returning stable results, went with a second pro-mini at 5v controlling the v3.0 (also enabling further expansion) running off a PSU, talking I2C to the Node.
My principal problem was winter condensation on the transducer head due to the pipe used, aside that the v2.0 ran two years before finally dying.
This time it's on plastic pipe and the v3.0 is socketed for easy swap should it go faulty, fingers crossed for a trouble free winter.
