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18 MarathonSeriesFA/FR
5.2Aiming
An effective aiming technique is to adjust the head until the highest reading is observed on the
internaldisplay.Whenthehighestreadingisreached,holdtheunitinplaceandsecurethemounting
base.Makesurethatthesensorisin1‐colormodewhenusingthisaimingtechnique!
Another
aiming can be done by means of a battery powered aiming light. Simply loosen the
compressionsleeveholdingthefiberopticcable,loosenthescrewattheheaterblock,andpullthe
cableoutoftheheaterblockapproximately7mm(0 .25in),see
Figure13,p.17.Raisethefiberoptic
cableenoughtosliptheaiminglightontotheend.Alignthelightbeamonthetarget.
5.3FiberOpticCable
Fiber optic cables and optical heads are able to withstand hot ambient temperatures up to 200°C
(390°F), optionaleven upto 315°C(599°F). They canalsooperate inareas ofhigh electromagnetic
fields,whichwouldrenderconventionalinstrumentsuseless.Thesmallopticalheadcanbemounted
incrampedlocations.Thefiber
opticcablehasasmallbendradius(36mm/1.5inminimum)andcan
be “snaked” around and through machinery, walls, and other obstacles. If the cable needs to be
changed,itisfieldreplaceable.Acalibrationprogramforreplacedfibercablesisincludedwithyour
sensor. Longer fiber
optic cables allow the electronics enclosure to be well away from hostile
environments.
Thefiberopticcableisfieldr eplaceable,seesection
10.4ReplacingtheFiberOpticCable,p.49.The
fiberopticcableandheadareonecomponent.Thecablecanbedisconnectedfromtheelectronicsbox
for aiming or threading through conduit during installation. The cable is keyed and can only be
insertedonewayintotheelectronicsenclosure.
Thefiberopticcableisasealed,stainless‐steel
armorsheathcoveringthefiberopticbundle.
BendRadiusofFiberBundle: 38mm(1.5in)minimum
CableDiameter: 6.5mm(0.25in)
AmbientTemperature: 0to200°C(32°Fto392°F),optionalupto315°C(599°F)
EnvironmentalRating: WatertightnessasperNEMA‐4(IEC529,IP65)hosedown
test,rated
attached and with protective sleeves, which prevents liquid from
entering through the connectors. Thegiven environmental rating is
notvalidforthe315°C(599°F)cables!