>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).

I am catching up on a months worth of PIClist emails, so you may already
have an answer to this.

Check out the Analog Devices AD590, there is a range of calibration
accuracies. The best is +/-0.5C at 25C, but there is stuff in the data sheet
on how to correct for linearity and offset errors.

Great little devices, used extensively in the space industry. They are two
terminal current devices, with a characteristic of 1uA/K, and at room
temperature, using a 10k ohm resistor will give 2.73 volts at 0C, ideal for
using with an ADC. We generally use the ceramic package version which gets
glued onto the surface to be measured. Leads are fragile, so we have a tiny
PCB to mount the sensor and connect the leads, along with a 1nF ceramic cap
to stop noise upsetting the device.

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