Michael Burton said:
Xaxis, could it be resting against the side of the fermenter at times? I am concerned this could make it sit more vertical and read artificially high values.
Thanks Michael, I hadn't thought of that. Perhaps when the krausen is high and the Tilt makes its way over to the side, the foam makes it hard for the Tilt to move or sit true. The Tilt website has this onnit regarding foam and CO2:
Q. How is the Tilt affected by foam?
A. There is no noticeable interference from foam. Foam plays a minimal role since it is significantly less dense than the beer and 95% of the device is submerged in the beer.
Q. How do bubbles from CO2 affect the Tilt?
A. We recommend putting the Tilt in your beer prior to pitching yeast, this will ensure any bubbles will not affect initial readings. Bubbles from dissolved CO2 may cause higher than expected readings for a short time if placed in an active fermenting brew. However, this can be sped up if washed with alcohol (i.e. Everclear).
I think I could understand a point or two variation in SG. It's the 5or 6 point swings that confuse me.
Just slightly OT, did you make any progress on you Pourtal project? I'm pretty interested in that one. I can see how it could be integrated into a brewstat.us profile and as my kegs are downstairs via a remote draw system I am keen on something that keeps an eye on the levels of beer in there.
Having said that, this is definitely drifting off topic. I have posted something on the thread you made about it in 2016.