I'm searching for a fast temp sensor for measuring ambient air temperature
(with some overhead) -- say -10deg-C to 120deg-C.  1% accuracy or better.

There are a lot of sensors that meet this numerical criteria, but what types
of temps sensors are *fast*?  I usually don't see response time listed in
the datasheets (and not even sure what the parameter is for response time),
and I don't have a specific value for how fast it should be, but I want to
compare various sensor types and start investigating/experimenting with the
fastest of these.

I did find "fast response RTD's" and wondering how they compare (speed-wise)
to other alternatives such as semiconductor sensors.  I expect the plastic
housings for TO-92 types and similar would be enough of an insulator to
significantly increase the response time.  Will the metal can versions
(TO-39 IIRC) be considerably faster?  Open element sensors and low-mass
sensors should be fast.  But I'm sure I am missing a lot of other
possibilities here.  

Any links/clues on this?

Thanks,
-Neil.

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