Yokogawa In-Situ Gas Analyzer TDLS200 - Manual (Page 99)

7-2 7-3
IM 11Y01B01-01E-A 6th Edition :Feb 13, 2013-00
<7. ROUTINE MAINTENANCE>
7.1.2 Replacing Windows
If the windows are contaminated they may be cleaned using the following procedure:
• If the analyzer has not yet been shut down, then please shut-down the analyzer properly and remove
power to ensure the laser if OFF
• Remove Launch or Detect (as appropriate) from the process interface by removing
the one fixed hole fastener (5/32” Allen Wrench), loosening the remaining three
fasteners and then twisting and pull off the unit.
• Remove the four retaining screws (3/32” Allen Wrench, T-Handle) and lock washers
from the window holder recessed inside the quick connect body.
• Remove the window that requires replacement.
• Ensure the new replacement window is of the same specification as the window
being removed. Standard Windows are 0.25” Thick wedged, BK-7 borosilicate crown
glass mounted in stainless steel retaining ring.
• The window holder assemblies can only be installed in one way by virtue of the
mounting hole placement.
• Ensure a new O-Ring (of same specification) is installed at the same time. Viton is the
standard material however, certain applications may require other materials – check
original specifications.
• With the new O-Ring in position, carefully locate the new window holder in place with
the smooth glass surface against the O-Ring.
• Carefully tighten all four screws (ensuring the lock washers are in place) using a
T-handle wrench. Keep tightening all the fasteners in turn by ¼ turns thus ensuring an
even torque loading.
• Hand tighten the screws until they are very firmly tightened (a T handle wrench as
shown below will torque its own shaft by about ¼ turn when the screws are fastened
securely).