Owner's manual

<7 ROUTINE MAINTENANCE> 7-1
IM 11Y01B02-01E-A 4th Edition September 11, 2012-00
7 Routine Maintenance
TheTDLS220TDLanalyzerrequireslittleroutinemaintenanceifithasbeencorrectlyinstalled,set-upand
calibrated. This section will outline the routine maintenance procedures. Maintenance procedures require
opening enclosures of certain modules. Make sure that there is no ingress of water or other liquids into the
analyzer modules during these procedures.
7.1Maintaining Good Transmission
The%Transmissionofthelaserlightthroughtheprocessgasowcellisthemostimportantvariableto
considerforroutinemaintenanceandtroubleshooting.Undernormaloperatingconditions(non-failure)
transmission will be affected by:
 •Window/Mirrorfouling.FormostapplicationsTDLS220extractivethesamplegasshould
be pre-conditioned and clean thus avoiding any window fouling issues.
  oItisVERYIMPORTANTtokeeptheprocessgascleanandnon-condensing.
  Deposits,oilylmsandotherresiduesdepositingonthewindow/mirrormaycause
  performancedegradation/cyclicaldrift.
 •AlignmentoftheLaserBeam-notnecessaryforTDLS220asitispre-xedatfactory
 •Particulateintheprocess.FormostapplicationsTDLS220extractivethesamplegas
 shouldbepre-lteredandcleanthusavoidinganywindowfoulingissues.
7.1.1 Maintaining Window and Mirror:
The incoming process gas should be pre-conditioned to remove any entrained liquids. The sample
gasshouldalwaysbemaintainedabovethedewpointtopreventcondensationwithintheowcell.Itis
recommendedthatacoalescingmembranetypelterbeinstalledup-streamoftheowcellinlet.Should
transmissionbecomelowerand/ortheresultsbecomenoisy/un-expectedthenitispossibletheprocess
wettedopticalsurfacesneedcleaningorreplacement.UsethefollowingprocedurestochecktheMirrorand
Window. Locations are as shown below: