Did you see faddy's post on the Ukrainian forums, he/she got almost zero humidity inside a sealed enclosure. The enclosure has desiccant and was also filled with kryptonm (dry gas). Dew point is <50 degrees C below ambient resulting in absolutely no condensation anywhere.
Faddy is using a separate humidity sensor inside the enclosure with a microcontroller outside. This could be a good indicator for when camera needs purging if we have spare pins.
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