Rammelkamp said:
What is the benefit of leaving it in the primary for longer? For the sake of example, what is the difference between 1-2-3 and 2-1-3?
Your primary is where all (okay,
most) of your fermentation takes place. It's usually done in a few days with your average ale. Higher gravity ales are a different beast...
But geting back to your question: Once the majority of your fermentation is done, you want to get the beer off the yeastcake and trub and into a clean vessel so it can begin to
clarify. The term "secondary fermentor" is really a misnomer, because very little fermentation takes place here. It's a clearing vessel and the longer you leave it in the secondary, the more stuff will settle out of it. I generally go 3 weeks in secondary before bottling... week 1 is at suggested yeast temperatures, and then I drop the temp and let it cold condition in the 52-55F range. This seems to really clear my beers up well. Then I bottle and generally crack into the first one after about a week to see how it's coming along. They really only start getting drinkable (read: more tasty!) after 2.5-3 weeks.
Rammelkamp said:
Ok, so when should I take a hydrometer reading?
When airlock activity settles down. If you're within a point or two of your target FG, then you should rack. Also, if you aren't sure where your FG should be, you can take hydro readings each of 3 consecutive days. If no change, go ahead and rack.
MAKE SURE THAT WHATEVER YOU USE TO GET THE BEER OUT OF THE PRIMARY FOR TESTING IS SANITIZED!!! A turkey baster works well for me, though after a little bit of time, I just go until I don't see any new stuff happening, and then rack off there. I only use my hydro to calculate efficiency (all-grain brewer), ABV%, and to log the OG and FG for future reference. Once it's in a carboy, I generally don't touch it until it's time to move it somewhere else.