Another newbie question:
I’ve noticed that my hydrometer seems to “settle” in my sample jar after a few minutes. I’ll take a reading soon after submerging the hydrometer (say 1.012), but when I return about 5 min later I’ll notice the hydrometer is floating considerably higher (approx. 1.020). Am I doing something wrong, or if not, which number should I consider my “true reading”?
You should de-gas your sample- if CO2 bubbles collect on the hydrometer, it will float higher and give you a false reading. I de-gas samples by pouring it between the test jar and another container a few times to get the CO2 out.
Probably CO2 bubbles attaching to the hydro and lifting it. If you give it a spin, they should dislodge and the hydro should resettle where it was.
I would let it set for a bit, say 30 minutes. Temperature needs to adjust accordingly as well, unless you make sure to do the proper calculations. Be sure to measure from the meniscus too. Make sure to shake the primary (if you are taking the O.G.) to mix the wort and water really well, if you don’t, this could lead to bad readings.
+1…spin it to win it.
I try to read below the water level if the wort is clear enough. One of those cheap halogen 150 watt work lights will shine through even dark worts.
Thanks for all of the tips, folks. I’ve now done it a couple of times and seem to have the hang of it much better.
And getting to taste my beer, although warm and flat, is a nice little bonus to the SG readings.
