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HLT upgrade
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Automated HLT filling. This was done using a simple two stage controller. The sensors are home made as I couldn't find anything off the shelf. These were made up of 1/2 inch BPT nipples welded top and bottom with plastic end caps used in rural irrigation to electrically isolate the probes from the keg which acts as ground. These caps were boiled in an electric jug for 15 minutes to test for heat and they stood up well. The probes used were stainless steel screws and nuts. Corrosion and electrolysis can be a real problem with this sort of gear.
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