Waterproofing outdoor sensors

[Vettester]

I've got Iris V1 contact sensors on my two gates that have been outside for almost 6 years without any waterproofing.

Best sensors for gates?

I just drilled the holes larger and use the screws on the front to hold them in. I have taken them out to inspect them. I had the same concern with my exterior doors as well but I put them on the top and let gravity hold them in with a slightly larger hole than recommended.