User manual

Maintenance
MarathonSeriesFA/FR 49
10.4ReplacingtheFiberOpticCable

FA fiber cable assemblies are not fieldʺreplaceableʺwithout blackbody recalibration!
Assuch,spareFAfibercableassembliesarenotavailable!
Ifthefiberopticcableeverneedstoberemovedorreplaced,itcanberemovedfromboththeoptical
headandelectronicsenclosurewithoutdemountingthemfromtheir
brackets.

Pleasebeawareofthefollowingwhenremovingorinstallingcables:
• Make sure cable connectors at the sensing head and electronics enclosure are clean before
removingand/orreplacingthefiberopticcable.
• Replacementfiberopticcablesofthesamelengthcanberecalibratedinthefieldbyusingthe

suppliedFiberReplacementCalibrationsoftware.Replacementfiberopticcables ofdifferent
lengthsrequirerecalibrationatthefactory,oratafactory‐authorizedservicecenter.Contact
yoursalesrepresentativefordetails.
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 before installing a new cable, the ends must be protected at all times until
connectedtothesensingheadandelectronicsenclosure.Cablesareshippedwithprotectiveendcaps.
Always save these caps for use whenever the fiber optic cable
 must be disconnected. Any
contaminationtothefiberopticcableendswilldegradeperformance.Toreplacethefiberopticcable,
youwillneedtodisconnectitfromboththeopticalheadandtheelectronicsenclosure.Thefollowing
instructionswillguideyouthroughtheprocess.
10.4.1RemovingtheFiberOpticCable
10.4.1.1RemovingtheFiberOpticCablefromtheOpticalHead
Completethefollowingstepstodisconnectthefiberopticcablefromtheopticalhead:
1. Thoroughlycleantheareaaroundtheopticalhead.
2. Insert a 1.3 mm (0.050”) hex wrench into the optical head’s hex screw and turn counter
clockwise
untilthecableisloose.
3. Drawthefiberopticcableoutoftheopticalhead.
4. Important–Ifyouplantoreconnectthesamecable,immediatelycovertheendwithaslip‐on
endcaptopreventcontamination.Donotuseanyadhesivetapeoverthecableend.