Thought I would share the below with others that maybe looking for an IP rated door/window sensor.
I have been looking for an Ingress Protected door/window sensor to go out in the weather on my front gate.
Since I could not find any, I’ve decided to try and mod an existing indoor rated sensor.
Xiaomi are quite cheap comparing with Fibaro or Aeotec so I gave it a go.
I used heat shrink of two sizes to fit both the length and the width of this sensor.
1/ 20mm which I fitted on the width and then a 30mm over the length. It is important that you fit first the width and then the length if the sensor is fitted vertical or the other way around if the sensor is mounted horizontal.
One last tip, be careful with the heat gun, just blow for few seconds and repeat until the heat shrink is well shrined. Too long, and you can barbecue your sensor.
My sensor has been fitted outdoors for two months and it went through some rain. Still going strong.
When I will need to change the battery, just easy dissect the heat shrink and do the above again.
Below few photos. I used black heat shrink as that what I had available at that time.