Re: [VAL] temperature monitor

["William Jacobs" <bjacobs1@xxxxxxxxxxx>]

Jim;
The idea of a temperature sensor for the "Cold Spot" has ofter been 
something I thought would be nice to have.  I wonder however if the 
thermocouple is the right answer.  The amplification from millivolts to 
usable signal will make it a noise nightmare in a none lab environment 
of 20  feet non shielded cable.
Have you considered a solid state temperature sensor?  Look at
http://cache.national.com/ds/LM/LM34.pdf
This gives an output of 10 millivolt per deg F.  It is very easy to 
interface to an A/D and has 1 deg accuracy.
70 deg F will be .7 volt.  It will also do below zero if a +- power 
supply is used.  There is also a deg C unit lm35.
Let me know what you come up with.
Thanks
bill
25 ft Trade Wind in WV