DS18B20 build questions

[bishoptf]

I am hoping @theatrus and others can chime in, I know he has built some and I finally got fed up and bought some real DS18B20 to build myself. I think the ones on Sparkfun - https://www.sparkfun.com/products/11050 are quality units but they are always on backorder so I decided to make some myself. My main question is do you pot the whole chip in epoxy or just use it to seal up the enclosure. I have been having issues with some probes, even when sealed with silicone still have had some that water is getting into them. I am just going to print some pteg cylinders and put the chips in that but wanted to know if you pot the whole chip or just seal the top.

Thanks

​

 

[Sral]

No practical experience about that on my part, but I would expect that, if you only potted the contacts of the chip, that the interface between the silicone/glue and the chip will be the weakest link and the first point of entry for water.

 

[Ranjib]

Same here.. never tried this route. I think I use the normal, duplicate ones from Amazon (generally the ones appears as Amazon choice).