Hi all,

Trying to calibrate a resistive temperature sensor, but my existing method is 
producing some inconsistent results.  Pot of oil on a stove at various temps 
and comparing the sensor to an LM35DT (~0.5 deg C accuracy).  The problem 
seems to be that the resistive sensor takes a significant time to come up to 
the temp of the oil and settle to a stable resistance.  If I read the data 
points when the oil temp is gradually rising, it varies significantly from 
when the oil temp is decreasing.   It is very difficult to get the oil to 
stay still at a specific temp for any decent length of time.  However, in a 
pot of boiling water, I can get a stable and trustable measurement.

So I need to do this for a range of around room temp to a few hundred degrees 
F (say 160 deg C), and would like to select easy-to-find chemicals that have 
various boiling points in this range and would be safe for me to boil on a 
stove.  I have found a bunch on the internet (example:  
http://www.engineeringtoolbox.com/boiling-points-fluids-gases-24_155.html ), 
but I'm not sure where to find much of these, and if they're safe to boil on 
a stove.

Any ideas how I can go about this?

Cheers,
-Neil.



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