If you are willing to calibrate each sensor then the only spec you need to
worry about is linearity (unless you will compensate for that as well). Most
sensors I've seen have linearity of 0.5 degrees or better. TTYL

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of David W. Gulley
Sent: January 23, 2003 11:47
To: PICLIST@MITVMA.MIT.EDU
Subject: [EE]Temperature Sensor


I am trying to find a temperature sensor with an accuracy of +/- 0.5
degree F (or about 0.25 degree C). Most of the sensors I have tracked
down have an accuracy of 1 or 2 degrees C which is not appropriate for
this application. The range of temperature is from -40 F to 160 F (-40 C
to 72 C).

Not having experience with the various sensors, I am not sure whether
the sensor accuracy is limited by device to device differences or
repeatability. If it is device to device difference, calibration of each
individual sensor over the range would be possible.

I have not researched the subject fully as yet, but thought some of you
guys may have come across something like this...   Anyone's experience
with accurate temperature sensing is greatly appreciated.

Thanks,
David Gulley

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