Myrangoli™ Thermowell available in PPH. /Ni or PPH. /Ta (Polypropylene Heat Stabilized / Nickel Alloys or Tantalum), give you the ultimate in corrosion resistance, at continuous service temperatures above 125°C. In many applications they will last longer. We offer standard and custom sizes and configurations to fit your needs. PPH. Thermowell dip tube units are accompanied by C-22 “Hastelloy” (Nickel Alloys) or Tantalum sensor bottom bush. A small amount of silicone oil in the bottom of the PPH. Thermowell dip tube helps facilitate heat transfer. Thermowell is utilized when pressure, high velocity and corrosive process media exist. This serves to isolate and protect the sensing instrument, and permits removal of a sensing instrument without shutting down the process.