>> P.339
SpecificationsofAirSupplyUnitforATScaleSupplyingcleancompressedairtothescaleunitisimportantasameansofimprovingtheenvironmentalresistance(resistancetocoolantanddustingress)ofassembly-typelinearscales.ProvidepipingtoeitherofthetwoM5screwholessituatedonbothsidesofthescaleunittoenablecompressedairdelivery.Note1:AT211(multipointfixed),ABSAT1300andABSAT1100Seriesarestandardequippedwiththeairsupplyconnector.Thisairsupplymethodisanauxiliarymeasure.Theorientationofairsupplypipingisamatterofimportance.Observethepipingorientationdescribedinthemanualtoimplementpiping.Aftertheairsupplyhasbeenstarted,theairfiltermustbereplacedperiodicallydependingonthedegreeofcontaminationoftheairsourcetobeused.Ifacontaminatedfiltercontinuestobeusedthiswillallowcontaminationofthescaleunit,resultinginfailure.1.AirqualityspecificationsISO85731-1Class1.4.1orequivalentMaximumparticlediameter(µm)Minimum-pressuredewpoint(°C)Oilconcentration(mg/m3)0.1+30.012.Airflowrate10to20L/min(peraxis)Thisflowrateshouldbemaintainedtothedegreethatairleaksoutslightlypastthedustproofrubber.2.1UsingtheMitutoyo-specfixedreducer(fixedreducerdiameter:ø0.9)Adjustairpressuresothattheairflowratebecomes10to20L/min(peraxis).(TIP)Whenairpressureis0.1MPaforoneaxis,theairflowratewillbeapprox.12.7L/min.Whenairpressureis0.2MPa,theairflowratewillbeapprox.19L/min.2.2UsinganyotherfixedreducerAdjustairpressuresothattheairflowratebecomes10to20L/min(peraxis).Fortherelationbetweenflowrateandairpressure,refertotheflowratecharacteristics(relationbetweenflowratedependingonfixedreducerdiameterandpressure)publishedbypneumaticdevicemakers.2.3UsingaflowregulatingvalveAdjustairpressuresothattheairflowratebecomes10to20L/min(peraxis).However,becarefulnottosupplyalargeflowofairbeforeadjustment.Otherwisedamagemayoccur,resultinginafailure.8-52
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