Carbon dioxide in vinyl anaerobic chambers
While monitoring the CO2 level within a newly installed vinyl anaerobic chamber, I noticed a steady loss of CO2 over a period of days that could only have been caused by diffusion of CO2 through the vinyl. This prompted me to model chamber operations over time to better understand the combined effect of CO2 loss from diffusion and CO2 gain from airlock operation.
Here I review some chamber basics, show outcomes of the model, review why CO2 is used in anaerobe chambers, and describe how I monitor and control CO2.
Battery backup power for a small freezer
The following equipment provides me with auto‑switching backup power for a manual defrost "Arctic King" 3.5 CuFt chest-style freezer maintaining a temperature of -24 to -27 degrees C. The system powers the freezer for 61 hours using ~80% of the battery discharge capacity. The freezer draws ~55 watts of power when running (probably ~50% of the time) and briefly more during compressor startup.
Retort stand - custom made
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