Sorry, for the word count but I've been struggling with calibrations and I think there are a lot of variable to cover. Here's what I did:
- I went thought the three point calibration process on the tilt app. The adjustments were (1) 1.004-->1.000; (2) 1.057 ---> 1.052; (3) 1.095 -->1.087. The temperature readings seemed less reliable. My test wort was 74-75 per my thermapen, and my tilt gave me 66/69. I did this with two tilts and the second was 67/69.
- I went to the tiltbridge.local page and put those same three data points for gravity--hydrometer SG vs tilt SG--in the calibration tool and saved. I had some trouble getting it to save. But eventually, I got something to stick in the tilt calibration equation section.
- Then I sync with brewfather and attach the tilt.
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I ran into two seemingly different issues:
First, the OG readings in Brewfather were far off. My OG was 1.069 but Brewfather showed 1.056. I THINK the tiltbridge unit said 1.056, but I'm not really sure. I know that the unit and brewfather match right now. So I think this is simply with the tiltbridge calibration. But this is off by a lot more than my tilt. I went back and looked at tiltbridge.local to confirm that the calibration equation stuck, which it did.
My sense at the time was that the calibration was not actually changing the output data. But when I ran the calibration (step 1 above), my tilt reading was reading 5ish points high, not 13 points low. The wort temp was about 68 per my inkbird, so I'm not in a zone where different temp readings would make a 15 point difference. My 1.069 hydro reading was before I pitched my starter, but a 1.5L starter into a 4.5g batch isn't going to make that much a difference.
Second, I checked again this morning. The tiltbridge.local page does not show any saved calibration equation. The tiltbridge unit reads 1.024. That matches brewfather. My tilt app shows 1.018 (and 1.022 pre-calibrated). I suspect that the calibration somehow got wiped, and the discrepancy is because of the temperature readings. My inkbird, which I think is correct, shows 75. My tilt now says 75 pre-calibrated, which is correct, but is adjusted to 81. That difference explains 1.022--->1.024.
There's no obvious point in the graph that would indicate a calibration change.
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So I guess my questions are:
1. Any idea why the OG would off so much?
2. Any idea why my calibration equation would disappear?
3. Does tiltbridge pull the pre-calibrated tilt data or does it use the calibrated number?
4. When doing the calibration, its says that if the reading is temp corrected, check the box and enter the correction. I don't understand this. Do I enter the temperature adjusted hydrometer reading as "actual gravity", the tilt pre-calibrated gravity as "tilt gravity", my thermapen wort temp, and the calibration temp of my hydrometer? My data points are: a) hydrometer reading; b) thermapen wort temp; c) a temperature adjusted gravity; d) a pre-calibrated tilt gravity reading; e) an adjusted tilt gravity reading; f) a pre-calibrated tilt temp readings; and g) a calibrated tilt temp reading.
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If you made it this far, thank you for your time!