I want to monitor temperatures in a DIY coffee roaster. Heat source is nichrome wire, and the beans are tumbled (6 rpm) in a stainless steel mesh cylinder that is 12" long and 4" diameter. For years I have been using an old-fashioned analog dial thermometer with a 10" probe. Now I plan to control the roast profile with a microprocessor, which will employ a K-type thermocouple. I bought a non-name 12" thermocouple probe on Amazon that turns out to be a 7mm OD stainless steel tube with the thermocouple pushed into it. Nothing affixes the junction to the tip of the tube, so it seems virtually certain that all that will be measured will be the ambient temperature at the tip of the tube. I don't think the response time will be adequate. My question -- would drilling an appropriate sized hole (~2mm) at the end of the tube to allow the junction to be exposed be the best way to make use of this? I have a lathe. Would additionally securing the tip in place with some kind of heat-tolerant cement be adviseable? The tip of the probe will be in contact with the tumbling beans. Thanks.
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