Hello,
I'm looking for a psychometric chart with a dry bulb temperature that goes to 500F, in imperial units. I've done numerous online searches. Most go to 120F. So far the highest temperature range I found was 300F.
I'm amazed that I still had this in my files. I worked for Proctor & Schwartz as a field service engineer early in my career, more than 30 or 35 years ago.
Hope it helps.
Proctor & Schwartz merged with Wolverine at some point to become Wolverine-Proctor. They don't seem to have an updated version of this chart on their web page, but might still have it available if you contact them.