5 inch lens get foggy need help 1

[Jonathan Lessard]

Hi, I have a bystronic bystar 3015 with btl2800, after only 30 min of cutting stainless with nitrogen my lenses get foggy (to me it look almost like humidity or oil film). My shop is high on humidity, my compressor deliver dry air ( dryer with air conditioning unit and inline dryer).
Anyone have a clue where I should look to find the issue?

 

[drossfree]

possible leak in your beam path. does it also happen on your other lenses.

 

[Jonathan Lessard]

I spoke with @Krugtech I spotted the issue my optic temp on my chiller is to cold, the heater element in the chiller is bad. That’s create some condensation