Owner's manual

<8 TROUBLESHOOTING> 8-3
IM 11Y01B02-01E-A 4th Edition September 11, 2012-00
• Record Results.Downloaddatalesfromtheanalyzerfore-mailtoYokogawaLaserAnalysis
Division.
8.1.2 Trouble Shooting Procedure for Lost and/or Low Transmission
ForaTDLanalyzertofunctioncorrectlytheremustbeasuitableamountofthelaserlightreaching
thedetector.Thereareseveralfactors(orcombinationsof)thatcanaffecttheamountoflightthatis
detectedonaowcellofTDLS220:
• Alignment:
The mechanical alignment of the laser beam with the detector unit
 o Thebeamisnotdirectedatthemirrorandnotreectedtothedetector
 o Thedetectornotalignedwiththeincominglaserbeam(fromthemirror)
• Contamination of Window and/or Mirror:
 Theprocessgasorothercontaminantshavefouledthecellwindowand/ormirror–cleaning
required and improvements to sample system to prevent repeat incident.
• Particulate:
The process gas optical clarity
 o Excessivesmokedensity/opacityand/orparticulatematterthatpreventssufcientlight
 fromreachingthedetector.Improvementstothesamplehandling/conditioningsystemshould
be made to remove particulate
• Weak Laser:
The output power of the laser module itself
 o Weakordeadlaserdiodesourcenotoutputtingsufcientlight
8.2 Analyzer Warnings
Warning Action Steps
Detector Signal Low. This is based on the amount of signal gener-
ated by the detector.
RefertoLoworLostTransmissionprocedure
Transmission Low. This is the most important diagnostic feature
of the analyzer. Transmission is a measurement of the laser power
strikingthedetector.Itisanarbitrarynumber(%)thatcanbecali-
brated.Theanalyzerwithacleansampleowcelliscalibratedat
100%transmissionwhenleavingthefactory.
Cleanwindowand/ormirrorRefertoLoworLostTrans-
mission procedure
Spectrum Noise High. This is based on a measurement of the
noise(standarddeviation)oftheabsorptionpeakbaselineregions.
Cleanwindowand/ormirrorContactYokogawaiffault
cannot be cleared
Process Pressure out of range. The gas pressure range for the
application is programmed into the analyzer.
Check pressure transducer feed to analyzer Check to
ensuresoftwaresetting(AdvancedMenu,Congure)is
correct