Unstable environment heat detectors?

We are installing a system in a brewery that periodically emits large amounts of steam. In addition to that, it is in a very old building that is very dusty, and has no venting at the peak so the steam accumulates, etc…

ROR heat detectors are out of the question, they would set it off without a doubt. I am considering 195 degree fixed heat but placing one of them over a brewing pit that emits steam at 212 degrees could still set it off.

I talked to my distributor who didn’t have a good suggestion either.

Any advice?