List,
Looking for a stable temperature sensor I first went to YSI. They have sold
their sensor products to. Measurement Specialties, Inc.
Perusing their site I came upon a Ni1000 SOT temperature sensor. It is a
nickel based unit that has a basic resistance of 1K ohms at 20 degrees C and
rising to 1482 ohms at 80 degrees C. . It has close to a 6 ohm change per
degree. I tried to find one of their distributors without success.
Entering the part number in Google, I found it is also made by ZETEX. ZETEX
calls it an IC TEMP SENSOR NI1000 SOT23-3. The Digi-Key catalog as part
number is ZNI1000CT ND. They are $2.77 each.
The ZETEX data sheet has a nice circuit for a digital thermometer.
Perhaps a LM 331 precision voltage-to-frequency IC or using a change in a
bridge circuit to a varactor on a VCXO might provide the lack of aging problems
that exist with a thermistor when precisely trying to obtain a
temperature-to-frequency conversion.
>From another site: DIGI-KEY Did you know that you can get FREE shipping on
>your order? Yes, that's correct -- no minimum order fee and no shipping
>charges. The "secret" is that you must send them a check or money order by
>mail. Time-wise, it will add a couple days to get your parts over ordering
>them via internet or phone -- the time it takes your letter to get to
>Minnesota. (See their "terms and conditions" on their website -- they cover
>themselves for very heavy cheap items.)
Regards,
Perrier
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