Metal ferrule-type machined from stainless steel Ferrule and thermocouple sheath are deformed during installation A metal ferrule-type fitting machined from stainless steel. Ferrule and thermocouple sheath are deformed during installation; therefore thermocouple cannot be repositioned after metal deformation. Mounting adapter is rated to 10,000 PSI, depending on temperature and thermocouple sheath diameter. Mounting adapter is used to mount a thermocouple at a given depth or a thermocouple head to thermocouple assembly.