Owner's manual

<8 TROUBLESHOOTING> 8-1
IM 11Y01B02-01E-A 4th Edition September 11, 2012-00
8 Troubleshooting
TheTDLS220TDLAnalyzertroubleshootingisfairlysimpleforaprocessanalyzer.First,virtuallyall
componentsusedinthesystemhavealongMeanTimeBetweenFailures(MTBF)withratedlifeof
componentstypicallyexceeding10years(whenoperatingwithintheirstatedspecications).Second,
most probable failures and problems are diagnosed by the system, generating internal warning and fault
conditions.
Theintentofthisguideistoprovidecommontroubleshootingsteps,itdoesnotdetailspecicrepair
procedures(suchaslasermodulereplacement),astheseareunlikelyandaredetailedinothersections
ofthemanual.Routinemaintenanceproceduresarealsodetailedinothersectionsofthemanual.
The most common issues are divided into two categories:
• Warnings. These are conditions which will affect the analyzer reading but not cause complete
lossofmeasurementintegrity.Anexamplewouldbereductionoftransmission(amountoflaser
 poweratthedetector)whichcouldindicatewindowfouling,wherethemeasurementisstill
being made, but further loss of transmission will cause loss of measurement.
• Faults. These are conditions where the measurement is lost, or degraded past the point of
reliability. An example would be loss of transmission, which could indicate complete miss-
alignment or laser failure.
TheTDLS220systemwilldiagnosemanycommonwarningsandfaults,takingthefollowingactions:
• Theanalyzergeneratesastatusagthatisdisplayedonthemainscreen;ifonlyonewarning/
 faultispresentthesystemwilldisplaythisonthescreen.The“ACTIVEALARM”menuselection
 willallowtheusertoviewallactiveWarningsandFaults
• Thesystemwilllogthewarning/faultinaloglealongwithadescription,time-triggeredand
time-cleared.
• The4-20mAsignalcanchangeto3.3mA(or20ma)underafaultorwarningcondition(user
 changeable).
• Thedigitaloutputoftheanalyzerwilltrigger(Channel1–Warnings,Channel2–Fault,Channel
 3–ConcentrationorTransmission)
• Theanalyzerwillcapturespectrafordiagnosticassistance
• TheResultslewillindicateaWarning(1)orFault(2)inthecontinuousResultsle
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