I am having a hard time finding a level measuring device that can handle an operating pressure of 4000 psig and temperature of 120 degrees C. This is in a vessel with a 3" diameter and is roughly 5" tall. Total volume is 500 ml. I have spoken with several manufacturers including Ametek/Drexelbrook, Siemens, and Rosemount with very little luck. I am now beginning to steer away from RF and Guided Wave Radar probes to a magnetostrictive device, yet cannot find one that with a MAWP above 3000 psig. Any recommendations?