we have a problem with reading through level gauge on steam drum with 400 C operating temperature and 120 bar pressure. Reason for this is the glass (mica) that is used to read the level because of steam has become blurred, and reading is difficult. Is there any way to fix the problem? I mean a better glass? And standard tell us what for what kind of level we should use in steam drums? if there is any standard, which? And finally is it better to go to magnetic float type level gauge or not?