thank you @BizzybeeTeam: exactly who I was gonna call in…
see also: Any Way to Measure Actual Inline Solvent Temp?
…and this (tee) is how I got at solvent and collection temps via the 1/2" compression fittings on the bottoms of the tanks. NOT a stock swagelok part.
you can purchase bored through fittings for thermocouples from a variety of vendors. eg