high precise Temperature sensor

[eplanet]

Hello friends
my expert friends I hope you have good day . in some months ago i made a project for sensing ambient  temperature with PIC micro controller and sensor was DS1820 and show at  2*16 character LCD.
you can see scheme in this attachments.

but i now looking for high precise temperature sensor that can sense in thousandth degree in centigrade.

can you introduce me a high precise temperature sensor?? or you think  i should use DS1820 but change program?
thanks

 

[KMoffett1]

So resolution of 0.001

 

[cachehiker]

A generic platinum RTD with get you a 100th of the way there for about $100.

There are also precision thermistors that are about as accurate for about the same price.

A metrology grade platinum RTD will get you a 10th of the way there for about $600.

I assume you already have signal conditioning hardware that's every bit as accurate?

Your pockets must be deeper than mine. I'd stop at $50 and 0.25

 

[KMoffett1]

Not only would the sensors be expensive, but the electronics with enough resolution "and" stability will be incredibly pricey.

Ken

 

[Hero999]

You'll also need to use a much more accurate ADC which will require the software to be modified.

I suggest you look at the schematic, read and understand the code. You probably need to start from scratch but some parts can probably be reused.

 

[KMoffett1]

And even if you can assemble a circuit with a resolution of 0.001

 

[eplanet]

i need to fined new strong sensor.