RayTek FA Manual

A SERVICE OF

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Accessories

MarathonSeriesFA/FR 35

8.2AirPurgeCollar

TheAirPu rgeCollaraccessoryisusedtokeepdust,moisture,airborneparticles,andvaporsaway

fromtheopticalheadʹslens.Itcanbeinstalledbeforeorafterthebracket.Itmustbescrewedinfully.

Airflowsintothe1/8”NPTfittingandoutthefrontaperture.Airflow

shouldbeamaximumof0.5‐

1.5liters/sec(1‐3cfm).Clean(filtered)or“instrument”airisrecommendedtoavoidcontaminants

fromsettlingonthelens.Donotusechilledairbelow10°C(50°F).Alsoprovidedisastainlesssteel

protectiontube,150mm(6inches)longby25mm

(1inch)diameterthatthreadsontothefrontofthe

airpurgecollar.



Figure31:AirPurgeCollarandProtectionTube(XXXFOHAPA)

8.3ProtectionTube

Theprotectiontubeisavailableasanaccessory.Itis305mm(12in.)longand32mm(1.26in.)in

diameterandcomeswith¾”NPTexternalthrea datoneend.Theopticalheadisthreadedwiththe

protectiontube.Theuseoftheairpurgecollarinthesame

timeispossible.



Figure32:ProtectionTubeforOpticalHead