
UltraLo‐1800AlphaParticleCounterXIALLCPage5
2. Gasrequirements
TheUltraLo‐1800requiresasourceofpure,dryArgongas–ideally,thegasprovidedisboilofffrom
atankofliquidArgon.Allmetaltubing(i.e.copperorstainless)shouldbeusedwhenrunningthegas
fromthesourcetanktotheUltraLo‐1800,andtheplumbingsystemshouldbefreefromleaks.Thegas
pressureattheinputtotheUltraLo‐1800isrequiredtobe21psi(150kPa)±5%.
ThegasinputfittingontheUltraLo‐1800isaSwagelok‐typeconnector:P/NSS‐400‐61,andrequires
¼”ODmetaltubing.AllnecessaryfittinghardwareissuppliedwiththeUltraLo‐1800system.The
installationprocessforthegastubeandfittingisstraightforward.IfanXIALLCrepresentativeispresent
duringsysteminstallation,theywillperformthisinstallationstep.
Figure2:GasInputInterface(Imagefromswagelok.com)
a) GasInletLocation
ThelocationofthegasinputfittingiscalledoutinFigure1.Priortothescheduleddateof
installation,thegastubingmustberunfromthegassourcetothesiteofinstallation,andterminateat
thespecifiedgasinletlocation.Theterminationofthe¼”metaltube(atthegasinletlocation)shallbe
runinsuchamannerastoprovideapproximately10”ofplay(inalldirections)forfinalalignmentduring
systeminstallation.
b) Summary:
Requirement(atinputtoUltraLo)Specification
GasArgon
Pressure21psi(150kPa)±5%
Tubing1/4"ODmetaltube
LocationAscalledoutinFigure1,±10”alldirections
c) Gassupplyandconsumption:
OurrecommendationistouseadewarofliquidArgon,andplumbtheboiloffgastothecounter.In
regardstogasconsumption,theUltraLo‐1800hastwodefinedflowrates;‘normal’(3.5LPM)and
‘purge’(15LPM).Whenyouinsertanewsample,thesystemrunsatthepurgerateforabout45
minutes,afterwhichtheflowisautomaticallythrottleddowntothenormalrateforthemeasurement.
Yourgasconsumptionwilldependonhowmanytimesyouinsertnewsamples.Forreference,the
countersatXIArunoffof230literliquiddewars.Onecounterrunningdailymeasurements(averagingat
least1purge/day)willconsumethedewarinabitovertwoweeks.