Grape Expectations
Member
EDIT: I already posted about this a year back, but without the chart, sorry!
https://www.winemakingtalk.com/threads/two-hydrometers-have-different-pa-at-the-same-sg.77396/
I have two Stevenson Reeves hydrometers: The S1011/U with a range of 5% PA to 17% PA and coloured bands, then the S1310 with a range of 0% PA to 23% PA that's plain old black and white.
I noticed a while back, they don't match up when I look at the PA and SG levels on them, so I made a chart.
The S1011/U (in red) shows a lower SG level for any given PA level, compared to the S1310 (in blue).
Does anyone know if there's a reason for this? The one I use is the S1310. If I aim at 1.100 SG with that, it lines up with 13.5% PA on the scale. If I use the other hydrometer, then 1.100 SG lines up with almost 16% PA - quite a big difference isn't it!
Which one is closest to reality?
Are they both wrong, or is at least one of them right?![Unamused face :unamused: 😒](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f612.png)
![Hydrometer Comparison.png Hydrometer Comparison.png](https://cdn2.imagearchive.com/winemakingtalk/data/attachments/109/109832-9674f929eb893505f3da6606571963ec.jpg)
https://www.winemakingtalk.com/threads/two-hydrometers-have-different-pa-at-the-same-sg.77396/
I have two Stevenson Reeves hydrometers: The S1011/U with a range of 5% PA to 17% PA and coloured bands, then the S1310 with a range of 0% PA to 23% PA that's plain old black and white.
I noticed a while back, they don't match up when I look at the PA and SG levels on them, so I made a chart.
The S1011/U (in red) shows a lower SG level for any given PA level, compared to the S1310 (in blue).
Does anyone know if there's a reason for this? The one I use is the S1310. If I aim at 1.100 SG with that, it lines up with 13.5% PA on the scale. If I use the other hydrometer, then 1.100 SG lines up with almost 16% PA - quite a big difference isn't it!
Which one is closest to reality?
Are they both wrong, or is at least one of them right?
![Unamused face :unamused: 😒](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f612.png)
![Hydrometer Comparison.png Hydrometer Comparison.png](https://cdn2.imagearchive.com/winemakingtalk/data/attachments/109/109832-9674f929eb893505f3da6606571963ec.jpg)
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