[heavyhadron]

If it is only a humidity sensor, then the potting compound outgassing shouldn't poison it. VOC sensors are much more sensitive. I would call the manufacturer of the sensors and ask technical support what they recommend to use.

EDIT: Silicone based compounds can poison many of your sensors! Use epoxy based potting compounds. Again, I would call the manufacturer of the sensor for guidance.

[antoniuschan99]

Thank you :)

[jasonlaramburu]

Block out ambient sensors and your antenna w/ foam to keep out the potting compound. You can also use a gore-vent on the ambient sensors to prolong lifespan. I would also suggest spending some time choosing your battery chemistry. It sounds like you will be freezing and thawing which can reduce the lifespan of lithium cells.