Bronkhorst FLOW-SMS Series Uživatelský manuál stáhnout pdf (Strana 10)

BRONKHORST HIGH-TECH B.V.

9.17.057 page 10

2.13 Description

2.13.1 Introduction

FLOW‐SMSsystemsarecompactmountingrailassemblies,

containingoneormoremassfloworpressuresensor

modules,thatcanbecombinedwithcontrolvalves,

shut‐offvalves,mixingchambers,filtersoranyother

functionalmoduleaspercustomer'srequest.

Alsothemanifoldonwhichthefunctionalmodulesare

mountedconsistsofamodularassemblyofsupportrails,

basebodiesandadapterorblindplates.



2.13.2 Functional modules

Thepicturesontherightsideillustratethemodularconcept

oftheFLOW‐SMSsystem.Itoffersgreatflexibilityfortheend‐user

withrespecttomodificationsandserviceability.Thefunctional

modulesare‘top‐mount’,sotheycaneasilybeexchangedwithout

removingthetotalassembly.



Inthefollowingparagraphswehavelaiddowntheinstructions

forremovalandreplacementoffunctionalmodules.



BronkhorstHigh‐Techrecommendstocleanortoreplacegasketsandhexagonboltsbefore

reassemblingfunctionalmodules.



FLOW‐SMSmanifoldcomponents(basebodies,distributionand mixingchamber,etc.)shouldonlybe

removedorreplacedbyqualifiedpersonnel.

2.13.3 Flow modules

- Generalinformation

Thegasflowsensoroperatesonaprincipleofheattransferby

sensingthetemperaturedifferencealongaheatedsectionof

acapillarytube.Partofthetotalflowisforcedthrough the

capillarybymeansofalaminarflowelementinthemainstream

generatingapressuredifference.Thedesignofthelaminarflow

deviceissuchthatflowconditionsinboththecapillaryand 

laminarflowdevicearecomparable,therebyresultingin

proportionalflowratesthroughthemeter.TheΔTsensedbythe

upstreamanddownstreamtemperaturesensorsonthecapillary

dependsontheamountofheatabsorbedbythegasflow.



Eachinstrumenthasbeencalibratedandadjustedforcustomerprocessconditions.Theperformance

andaccuracymaybeaffectedtremendouslyifphysicalfluidpropertiessuchasheatcapacityand

viscositychangeduetochangingprocessconditions.Foroperationonothergasesseeparagraph4.1.

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