petrolSpice
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- Dec 31, 2013
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I have a 5 cuft chest freezer that I use as a fermenter. Heating is provided by 2 fermwraps. Control is achieved with an STC-1000. The temp probe is in a thermowell that it in the center of the wort. I am using a Speidel 7.9 gallon fermenter and usually have around 7.5 gallons in it.
The issue is that when fermentation is not active and the wort is still, the fermenter is overshooting the target temp. This leads to it cycling between cold and hot with swings of 1-1.5 degC even with the offset set to 0.3 degC in the STC-1000. Eventually it will level out, but sometimes it will go back and forth for 10+ hours.
I believe this is happening because the probe is in the middle of the wort where it takes longer for the heat or cold to reach it. By the time it reaches the probe, the rest of wort is already past the target temp.
When I was doing 5 gallon batches in carboys this seemed to be far less of an issue.
I could move the probe to the side of the fermenter but I like the accuracy of the thermowell especially during active fermentation.
The issue is that when fermentation is not active and the wort is still, the fermenter is overshooting the target temp. This leads to it cycling between cold and hot with swings of 1-1.5 degC even with the offset set to 0.3 degC in the STC-1000. Eventually it will level out, but sometimes it will go back and forth for 10+ hours.
I believe this is happening because the probe is in the middle of the wort where it takes longer for the heat or cold to reach it. By the time it reaches the probe, the rest of wort is already past the target temp.
When I was doing 5 gallon batches in carboys this seemed to be far less of an issue.
I could move the probe to the side of the fermenter but I like the accuracy of the thermowell especially during active fermentation.