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I am starting to think everyone is missing the point or is reading too much into what I am trying to do, quite possibly because I haven't explained the project properly at all. It is going to be an insulated, 2-zone climate controlled enclosure for 2 fermenters. It will regulate the temperature...

The idea of the pressure sensor is mainly to act as a bubble counter, I am not trying to control the internal pressure of the fermenter in any way (even though this would be possible for very little extra money) My theory goes as follows... During fermentation, CO2 is produced by the yeast...

My plan is to build the enclosure so that I won't really need to open it up unless deemed necessary, I will also be putting a viewport in the doors so I can observe the progress without needing to open the door. Yeah, I do :D, The whole project is going to be a marriage of my various different...

It's going to improve my brew by mainly being able to monitor and regulate the temperature (both heating and cooling) of my brew since my house being largely uninsulated (old, weatherboard with temperature swings of up to 30 degrees and beyond) is a pain to moderate the temperature so being able...

Thanks for the response guys, It has been EXTREMELY helpful. From what I have been able to work out from the responses to my question, the differential pressure between the fermenter and outside world is rather small. I will then look at a 0.1mbar pressure sensor (about US$65 from digikey) I...

Hello, As a I have been trawling all over the interwebs trying to find an answer to what I thought would be an easy enough question. I was wondering how much pressure builds up inside the fermenter before the airlock releases a bubble of gas? I need to know as I am wanting to build a setup...