I'm working with some heat transfer measurements to superfluid helium, and I use CX-1050-BC's to measure the temperature of my heating element.
I was wondering if anyone has info about how much heat I can assume is being carried away from the sensor through the copper leads. In a steady state, say my CX reads 4.1 K, while my bath is at 1.9 K. The CX is embedded in a structure that has leaves a path of about 15 mm of epoxy glue (eccobond, which is a two-component epoxy with very good crack resistance at superfluid temperatures). The copper leads from the sensor follow the same 15 mm of epoxy. So linearly, the gradient would be on the order of 2 K / 0.015 m = 130 K/m. What kind of heat flux can I assume would flow from this gradient?
I saw in another thread that the sensor leads are attached with silver epoxy, which has a much lower thermal conductivity than copper, but on the other hand, the silver epoxy can't be much thicker than a few tens of µm, maybe 25 or so, given the size of the bead of epoxy on the pads of the sensor.