Hello,
I am performing testing on load cells over a thermal range (40-135F). Currently I have a NON-insulated area made of Bent Sheet metal, this area is relatively closed up with an opening on one side for the application of hot/cold via a portable ceramic heater / air conditioner respectively.
Currently I have no problems with heat, I can hold it relatively stable to +/- 0.2 degrees over (80-130F).
On the cold side I would like to get down to 40 deg F, . the problem is stability. The unit gets down to 45 deg f, then begins to frost up, then the output slowly increases to about 55 deg F where it stabilizes off.
I understand one method would be to get a frostless, however I think that it may introduce thermal output fluctuations.
Any Suggestions... I would like to hold +/- 0.2 deg F from 45 deg F- Room Temp
Thank you for your time jqm