Yokogawa In-Situ Gas Analyzer TDLS200 - Manual (Page 19)

19
IM11Y01B01-12E-A
1st Edition
Mounting the Launch and Detect Units to the Process Flange
Securely bolt the Launch and Detect (LAO) Units to the process flanges using the standard bolt
holes/studs provided. Ensure the correct size bolts, nuts, and gasket are used in accordance with
the flange specifications and in accordance with the process specifications when applicable.
CAUTION: Use anti-seize paste on threads to avoid possible metallic galling on
nuts/bolts/studs!
START flow to the clean dry window purge gases as soon as possible if the process valve is
open – this will prevent contamination to the optical surfaces. Before starting the actual
purge flows, ensure the lines have been blown out to remove all debris, dirt, oil, water and
other media that could contaminate the optical surfaces and impaired the optical
transmission/measurement performance.
NOTE: the optical surface temperatures MUST NOT exceed 70degC!!!
NOTE: If the process isolation valve flange is excessively hot due to the process temperature or
radiant heat, then a thermal insolating flange gasket should be used in order to minimize the heat
transfer to the analyzer flange face.
It is generally beneficial to make the flange of the Launch and Detect Units and the flange of the
process concentric with each other. Due to the large clearance provided by standard flanges and
bolts, it is possible to mount the two flanges in an un-concentric manner – this should be avoided
to aid laser beam alignment.