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Poor man's Thermal Chamber, meat packing box II
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joeqsmith:
Trying another sweep from -10 to 60C using the new setup.   This meter doesn't seem as stable as the UT181A. 


branadic:

--- Quote ---Please explain what you mean by "additional cooling packs".
--- End quote ---

I mean additional thermal packs for cooling put to the bottom of the thermal chamber.

-branadic-
joeqsmith:
I assume packs like you would use in an ice cooler.    That wouldn't work very well for me.  I could get the chamber down to the pack's temperature but going beyond that would slow it down.  Just having a meter in the box slows it down a fair amount.    Not to mention slowing the heating.  Odd as you show no problems heating it with these cool packs in the chamber. 

I have a fair bit of air movement inside and the RTD is located near the center of it.  Is your sensor located next to the Peltier?  What sort of air circulation do you have inside?  Pictures may help.
joeqsmith:
Temps started out fine but then the lab reached about 84F.  The box struggles at -10C even with the camera turned down. The camera puts out a fair amount of heat.



joeqsmith:
Opened the windows of the lab during the evening and let it drive as low as it could go.  Used the newer BM869s  for this test. 

Once I started to heat, the fan inside the chamber froze up.   It took some time for the temp to thaw the ice.   During this time the meter was iced over, so you can't see the LCD.    Still no where near last Winter's temps.     

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