Liquid filled DS18B20 temperature probe

thingiverse

This is a liquid filled temperature probe for a kegerator, keezer, or any other refrigerator where you want to track the liquid temp, and not just the air temp inside the fridge (which will swing high and low significantly with compressor cycles). This uses a very common digital temp probe, the DS18B20, in a waterproofed stainless package. If you're an Arduino person, you know where to find these. For the liquid tube, I am using a cleaned out White Labs yeast vial. All you home brewers have these laying around everywhere! First part holds the actual vial, and you can double-side tape it to the wall in your kegerator. Second part keeps the temp probe suspended in the liquid, so it is not touching the side walls. I'm using this with a solution of about 50% vodka and water, just to keep it from icing up when the temps are hovering right near freezing. Please let me know what you think in the comments. I'm not sure about the long-term effects of alcohol on PLA, whether it will dissolve it or not. EDIT: 2 1/2 years later, there is no sign of dissolving the spacer inside the vodka solution, so I think we can call this one good! This is not a food-safe application, remember the alcohol solution is self-contained in the vial strictly to measure temp, and is not consumable. Included the original SketchUp files as well in case you want to edit. Enjoy! Print Settings Printer Brand: RepRap Printer: Wanhao i3 clone (Monoprice version) Rafts: Yes Supports: No Resolution: 0.2mm Infill: 15%