Yokogawa Extractive Oxygen Gas Analyzer TDLS220 - Manual (Page 61)

<7 ROUTINE MAINTENANCE> 7-8
IM 11Y01B02-01E-A 4th Edition September 11, 2012-00
THE WINDOW COULD BE HOT FROM THE HEATED CELL
• This process wetted window is constructed of sapphire and is therefore more durable than the
mirror surface. Use a clean, dry instrument air or nitrogen pressure (or canned air) supply to first
blow off any particulate matter.
• Using warm water and mild soap detergent, gently clean the window surface with a soft,
non-abrasive cloth.
• If the deposits do not come off then use a small amount of IPA and a soft, non-abrasive cloth.
• Use the same clean, dry instrument air or nitrogen pressure supply to blow dry the surface.
• Carefully check the entire surface of the window from different angles to ensure it is thoroughly
cleaned and ready for service.
• If the window does not appear to clean up well, then replace the window assembly with a new one.
• If the window appears to have an etched (or pitted) surface then it has probably been
contaminated with HF or other similar corrosive gas! A new window should be installed.
• Check and replace if necessary the window o-ring.