Time to make a blow off tube. :thumb:
On the subject of temperature control - the optimum solution is to immerse the sensor directly in the brew, this forms the most accurate way to measure and monitor the temperature as the fermentation process creates heat.
However this creates the issue of introducing possible contamination, therefore the next best solution would be to immerse in a small container of water inside the fridge, therefore a similar liquid environment to the brew, not ideal but better.
The third option is to secure the sensor to the outside of the FV, preferably inside some sort of thermal protection shielding it from the surrounding air, (bubble wrap works well in this instance) the air temperature surrounding the FV will be different to the temperature of the fluid, so taping the sensor to the inside of the fridge will give a false temperature reading, also when the fridge is active the walls tend to be the coldest part.
http://www.thehomebrewforum.co.uk/showthread.php?t=54503&highlight=temperature&page=2
Have a read of this - Twostage has done quite a bit of research into what results you get from different sensor locations...
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