Keeping the probe out of the path of descending reflux is a good idea. My own is off to one side so I never had that problem. A probe at the bottom would be useful but in my retort it would not survive for long.
The pipe between boiler/retort and distilling/reflux should be open at all times. In fact there should be no valve in case someone might accidentally close it. I bring my temperature up to 385c gradually in steps over 2 hours to avoid blockages. This might not be so important with wmo but with solid plastics there is a danger that the lower layer will melt and boil pushing the upper semisolid layer upwards and blocking the outlets at the top of the retort. That situation could be very dangerous.
The pipe between boiler/retort and distilling/reflux should be open at all times. In fact there should be no valve in case someone might accidentally close it. I bring my temperature up to 385c gradually in steps over 2 hours to avoid blockages. This might not be so important with wmo but with solid plastics there is a danger that the lower layer will melt and boil pushing the upper semisolid layer upwards and blocking the outlets at the top of the retort. That situation could be very dangerous.
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