----- Original Message ----- From: "Wagner Lipnharski" To: Sent: Sunday, December 01, 2002 11:41 PM Subject: Re: [OT]: Temperature Sensors? The only problem with RTDs and NTCs is its top temperature. The RTD Panasonic ERTD2FHL103S (Digikey $1.06) goes from -30 up to +1250C only!!! The NTC Thermometrics Global AL03006-5818-97-G1 (Digikey $2.66) goes from -50 to +2040C (+4000F) only. If you need to cook SMD, it needs to go at least to 4500F, obviously should operate at least up to 20% more, or, around 5300F. A THERMOPILE is a nice non-contact sensor, that can measure the temperature away of it. The MLX90247B (Digikey $13) in TO39 4 leads, generates 40uV/K and it incorporates a 26 kohms PTC in the same die, so you can compensate ambient temperature. Even that operating temperatures should be from -40 to +1500C, this is the thermopile temperature, not the reading non contact temperature, even that I could not find its reading temp range. http://www.melexis.com website can give you more details about this chip. They also have modules with complete solutions, digital or analog output, but be aware of their $65 prices. -------------------------------------------------- VV46NER The last RTD I used was -196 Deg C to 600 Dec C which is well within the original post's range! Regards, {slewrate} -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu