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MarathonSeriesFA/FR 49
10.4ReplacingtheFiberOpticCable
FAfibercableassembliesarenotfieldʺreplaceableʺwithoutblackbodyrecalibration!
Assuch,spareFAfibercableassembliesarenotavailable!
Ifthefiberopticcableeverneedstoberemovedorreplaced,itcanberemovedfromboththeoptical
headandelectronicsenclosurewithoutdemountingthemfromtheir
brackets.
Pleasebeawareofthefollowingwhenremovingorinstallingcables:
• Make surecable connectors at thesensing head and electronics enclosure areclean before
removingand/orreplacingthefiberopticcable.
• Replacementfiberopticcablesofthesamelengthcanberecalibratedinthefieldbyusingthe
suppliedFiberReplacementCalibrationsoftware.Replacementfiberopticcablesofdifferent
lengthsrequirerecalibrationatthefactory,oratafactory‐authorizedservicecenter.Contact
yoursalesrepresentativefordetails.
Always clean the area around the fiber optic cable connectors before disconnecting. If any
contaminants get into the open connectors,
the sensor’s accuracy will be compromised. After
removing the cable,or beforeinstallinga newcable, theends must beprotected at alltimes until
connectedtothesensingheadandelectronicsenclosure.Cablesareshippedwithprotectiveendcaps.
Always save these caps for use whenever the fiber optic cable
must be disconnected. Any
contaminationtothefiberopticcableendswilldegradeperformance.Toreplacethefiberopticcable,
youwillneedtodisconnectitfromboththeopticalheadandtheelectronicsenclosure.Thefollowing
instructionswillguideyouthroughtheprocess.
10.4.1RemovingtheFiberOpticCable
10.4.1.1RemovingtheFiberOpticCablefromtheOpticalHead
Completethefollowingstepstodisconnectthefiberopticcablefromtheopticalhead:
1. Thoroughlycleantheareaaroundtheopticalhead.
2. Insert a 1.3 mm (0.050”) hex wrench into the optical head’s hex screw and turn counter
clockwise
untilthecableisloose.
3. Drawthefiberopticcableoutoftheopticalhead.
4. Important–Ifyouplantoreconnectthesamecable,immediatelycovertheendwithaslip‐on
endcaptopreventcontamination.Donotuseanyadhesivetapeoverthecableend.