On Tue, Oct 19, 2010 at 3:17 PM, alan smith wrote: > thanks for the responses...i've forwarded these sites to my client for hi= s review. =A0When you said you have had better luck with RTD's over thermoc= ouples, can you explain what your experiences were? =A0RTD's are generally = less expensive, but are they as stable as a thermocouple? I just temperature compensated my RTD and was able to achieve decent resolution and accuracy with a simple voltage divider. My application was also food services (prototype cooking machine). There are also differential AtoD reference designs for RTDs, but I didn't find that beneficial in my application. How accurate do you need the probe to be? I'd be surprised to hear of anything requiring accuracy of more than 0.2c in the food service industry. -marc --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .