The reason why you'll don't find fast and accurate temperature sensors
is because the temperature variation is slowly by definition (faster
in air speed and slower in liquid). The speed of the analogic
temperature sensors is gaven by the size of the sensor. A thermocouple
without case or a thin film RTD is faster than a thermocouple with
case or a huge 5mm diameter RTD.

You can find at Omega some small and cheap RTD which could met your 1% request.
But from the sensor accuracy to the final measuring value accuraccy
it's a long way.

Vasile

On 6/25/08, PicDude <picdude2@avn-tech.com> wrote:
>
> 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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