Extending Temperature sensor

[BigWumpus]

Try this:

AD595 mit an Type K Thermocouple and maybe 12V voltage,
a very good voltage-divider to convert 10V to 5V ;-),
a very good 5V-reference for the AD-Part of the PIC,
10 Bit resolution,
a table of the real temperature compared to the voltage ...

look inside the datasheet !
I've made an Excel-sheet of the temperature vs. voltage and so I got the %-error for every 100°. So I could interpolate the real temperate.

[J. Mark Wolf]

The Maxim MAX6675 part will work fine for you. It's a K-type to SPI interface chip, good to 1024 deg C. I've used it, works good.

[sianjohn]

Thank you for assistance i will try this chip i'll wait for the parts to arrive...

Thanks