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Most temperature sensors these days are semiconductor devices that do not have any precious metals in them. Thermocouples, which I'm assuming you are referring to, aren't very well suited for equipment like this so there wouldn't be any in them. They don't even have much of any rare/precious metals in them anyway.
Not sure what you mean by "aren't very well suited", but they do just fine, nothing is more durable or responds faster than a thermocouple. You're talking about thermistors, and yes those are temperature sensors but of the three major types, they would be the last choice for an outdoor/industrial application; they're found mostly on consumer electronics.
PT100 and PT1000 are the most common types of RTD and would be the type of sensor I'd expect to find in this type of application. But there's not going to be a pound, lol
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