From: muratlanne@gmail.com   
      
   "Curbie"  wrote in message   
   news:n557g7pj6jo6atn6u326v34bqsrvk7io02@4ax.com...   
   > ...   
   > I think you're in the land of multiple thermocouples, they're are not   
   > very accurate, but a way to get more accurate readings, is to read the   
   > thermocouples many times, then average their readings by time slice.   
   >   
   > I know I saw pressure sensors, but I don't recall what their ranges   
   > were.   
   > Curbie   
      
   The hydrogen-rated pressure sensors I found cost $400 each, and had warnings   
   about long-term hydrogen embrittlement of their sensing disphragms.   
      
   I checked three type K thermocouples from different sources in boiling water   
   and saw less than half a degree error. The stainless clad probe was best by   
   only a little over the 24 and 20 gauge welded wires.   
      
   Pure lead melts at 327.5C. If it's pure it will melt all at once, if not it   
   will solidify over a temperature range. It's used for black powder cast   
   bullets. Lead for modern bullets is a lower-melting alloy.   
   http://en.wikipedia.org/wiki/Solder   
      
   The inaccuracy of thermocouples comes from variations in their alloy   
   composition, and mainly poor contact with the object being measured.   
   Statistical averaging won't help, it's a systemic error, in my experience   
   always low. The ones wired to my wood stove rise or fall in steady 0.1C   
   steps as it heats or cools with almost no noise bounce.   
      
   jsw   
      
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