ESEM filament is back online Published January 21, 2020 By Status 1:56 p.m. ESEM filament is back online and working fine. Ready to use. 12:15 p.m. The filament burned yesterday after. We put a new one in this morning but its not working just right. We are working on it now. ← Previous Post ESEM down – filament burned out Next Post → Annual Steam Shutdown and Power Outage