Bronkhorst FLOW-SMS Series Instrukcja Użytkownika Pobierz pdf (Strona 9)

BRONKHORST HIGH-TECH B.V.

9.17.057 page 9

2.9 Purging

Insystemsforusewithcorrosiveorreactivefluids,purging foratleast30minuteswithadry,inertgas

(likeNitrogenorArgon)isabsolutelynecessarybefore use.Afterusewithcorrosiveorreactivefluids,

completepurgingisalsorequiredbeforeexposingthesystemtoair.

Warm‐uptime:

Lettheinstrumentswarm‐upforatleast30minutesforbestaccuracy.

Duringwarm‐upperiod,fluidpressuremayeitherbeonoroff.

2.10 Zeroing

Thezero‐pointofeachinstrumentisfactoryadjusted.Ifsorequiredthezeropointmaybere‐

adjustedoverRS232orfieldbusorbymeansofusingthemicroswitch.Procedureforzeroing by

microswitch:

 Warm‐up,pressureupthesystemandfilltheinstrumentaccordingto theprocess

conditions.

 Makesurenoflowisgoingthroughtheinstrumentbyclosingvalvesneartheinstrument.

 Thesetpointmustbezero.

 Pressmicroswitchandholdit.AfterashorttimetheredLEDwillgoONandOFF,thenthe

greenLEDwillgoON.Atthatmomentreleasethemicroswitch.

 ThezeroingprocedurewillstartatthatmomentandthegreenLED willblinkfast.The

zeroingprocedurewaitsforastablesignalandsavesthezero.Ifthesignalisnotstable,

zeroingwilltakelongandthenearestpointtozeroisaccepted.Theprocedurewilltake

approx.10seconds.

Whentheindicationisshowing0%signalandthegreenindicationLEDisburningcontinuouslyagain,

thenthezeroingactionwassuccessful.

2.11 Calibration

EachFLOW‐SMSinstrumentisfactorycalibrated.Calibrationcertificatesareincludedintheshipment.Whenoperated

properly(cleangases,nopressureshocks,novibrations,nothermalshocks,etc),regularmaintenanceisnotrequired.

However,periodicalinspection,recalibrationorverificationoftheaccuracymaybesubjecttoindividualrequirements

oftheend‐user.Pleaserefertotheinternaloperationalrequirementsofyourcompany.

2.12 Supply pressure

Itisrecommendedtoturnonpowerbeforeapplying pressureontheinstrumentandtoswitchoff

powerafterremovingpressure.

Turnonfluidsupplygently.Avoidpressureshocksandbringtheinstrumentgraduallyuptothelevelof 

theactualoperatingconditions.Alsoswitchofffluidsupplygently.

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Bronkhorst FLOW-SMS Series Instrukcja Użytkownika Strona 9