68ohm heater for Heliox sorb (59-PRZ0017)

A replacement 68ohm heater for Heliox helium 3 sorption pump. Heater cement also required for replacement (C5-105). 68 ohm.

At low enough temperatures gases adsorb to cold surfaces. If a material with a very large surface area can be cooled to a sufficiently low temperature then this material can be used as a pump. Oxford Instruments’ Heliox range of inserts use such sorption pumps
to lower the vapour pressure above the 3He surface and so attain low temperatures. The use of an internal pump also has the benefit of connecting the 3He pot to the pump by the shortest (and coldest) pumping line possible.