I should probably add more picks for illustration but you guys will get the idea. The carboy cap has two connections; one for blowoff, and one for taking a sample. I attached a piece of tubing to the underside of the carboy cap on the sample tubing that extends to the center of the wort. The small glass container is used to collect the sample. It has three inlets/outlets on the cap. One is not used (clamped closed), one is for beer in, and one is used to apply suction that will transfer the wort into the sample bottle.
The tubing that transfers the sample has two clamps. When you take a sample only open and close those clamps with suction applied so you dont have wort traveling back down into your beer.
The bucket serves two purposes. First, and foremost, it collects blowoff. Secondly, when a sample is taken air enters the system. Rather than going directly into your carboy it first has to enter the bucket. Be sure to use an S style air lock.
Using this method I have been able to take daily samples without having to sanitize equipment beforehand and I dont risk exposing the beer to infection or oxidation.
The tubing that transfers the sample has two clamps. When you take a sample only open and close those clamps with suction applied so you dont have wort traveling back down into your beer.
The bucket serves two purposes. First, and foremost, it collects blowoff. Secondly, when a sample is taken air enters the system. Rather than going directly into your carboy it first has to enter the bucket. Be sure to use an S style air lock.
Using this method I have been able to take daily samples without having to sanitize equipment beforehand and I dont risk exposing the beer to infection or oxidation.