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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
That sensor as you refer to it is on the control board. The actual metal portion is on the burner assy and I have almost never seen anyone use or need one in over 15 years of working on these. Get a new Dinosaur Electronics board and install that. The one you want is called a "UIB-S" version and shop around as the price varies. Don't forget to check the LP working pressure at the tank regulator as that can affect this and lead to a damaged burner head if it gets too low. Hope that proves helpful here. Please get back to me if you need more as all follow ups are included in our fee.
In addition to what I share in my previous response I am adding a link to the Atwood Hydroflame Serivce Manual for you. Click on that and then print out a copy. Good information in there and it describes the way the flame sense works. http://bryantrv.com/docs2/docs/hflamefurn04.pdf
Since I didn't hear back from you I am wondering if you saw my earlier responses or not? Or were you able to get this resolved with the information I provided? Please let me know if you need additional input on this issue. Thanks!