Mass Flowmeter

7/23/2019 Mass Flowmeter

1/14

MASS FLOWMETER

Coriolis MassFlowmeter

Thermal MassFlowmeter


2/14

Mass Flowmeter

Also known as an inertial fow meteris a device that measures mass fowrate o a fuid throuh a tu!e"

#oes not measure the volume $erunit time !ut it measure the mass$er unit time fow throuh the

device"


3/14

Coriolis Flowmeter%" &ow coriolis fowmeter

works'''oriolis fowmeter measure the orce resultin rom the acceleration caused !(ovin toward)or awa( rom* a center o rotation"

he e+ect can !e demonstrated !( fowin water in a loo$ o fe,i!le hose that i!ack and orth in ront o the !od( with !oth hands" -ecause the water is fowitoward and awa( rom the hands. o$$osite orces are enerated and cause thetwist"he swinin is enerated !( vi!ratin the tu!e in which the fuid fows"ensors and a Coriolis mass fowmeter transmitter are used to measure the twis

enerate a linear fow sinal"


4/14


5/14

/icture 0 1 Coriolis mass fow meter2Rotamass 32series


6/14

0"&ow to use Coriolis Mass

Flowmeters

4t is use to measure the mass fow o li5uids.such as water.acids.caustic.chemical and ases6va$ors"

The measurement is not a+ected !( fuid densit( chanes"

7eed to !e careul when measured as6va$or fows !ecause fow ratestend to !e low in the fow rane"

4n a as6va$or a$$lication.lare $ressure dro$s across the fowmeterand its associated $i$in can occur"

This fowmeter can !e a$$ilied to sanitar(.cr(oenic.relativel(clean.and corrosive li5uids and ases6va$ors in smaller than 82%0in"

Materials construction are enerall( limted to stainless steel and&astello( C

Straiht2tu!e desins are availa!le to measure some dirt( and a!rasiveli5uids"

Man( a$$lications or Coriolis mass fowmeters are ound in chemical$rocesses where fuids can !e corrosive and di9cult to measure

These fowmeters can also !e used in chemical eed s(stems ound inmost industries"


7/14

3" 4ndustries where used

4ndustries such as chemical.oil and as.ood and !everae./harmaceutical.$ul$ and $a$er.$ower.metals and mini and waterand wastewater ollowed !( all others in small amounts"


8/14

:" A$$lication Cautions or Coriolis

Mass Flowmeters

4 the $ressure dro$ is

acce$ta!le.o$erate a Coriolis massfowmeterin the u$$er $art o its fowrane !co;o$eration at low rates can

derade accurac("

For li5uid fows. make sure that the fowmeter isCom$letel( ull o li5uid

/a( s$ecial attention to installation

-ecause $i$e vi!ration can causeO$erational $ro!lems"


9/14

Thermal Mass Flowmeter

%" &ow thermal mass fowmeter works'''

hermal fow meters use the thermal $ro$erties o the fuid to measure the fowfuid fowin in a $i$e or duct"a t($ical thermal fow meter. a measured amount o heat is a$$lied to the he

the sensor" As fow increases. more heat is lost" The amount o heat lost is sentem$erature measurement)s* in the sensor"he transmitter uses the heat in$ut and tem$erature measurements to determifow" Most thermal fow meters are used to measure as fows"he amount o heat lost rom the sensor is de$endent u$on the sensor desin athermal $ro$erties o the fuid" The thermal $ro$erties o the fuid can and do v

$ressure and tem$erature. however these variations are t($icall( small in mosa$$lications"these a$$lications where the thermal $ro$erties o the fuid are known and rel

constant durin actual o$eration. thermal fowmeters can !e used to measurefow o the fuid !ecause the thermal fow measurement is not de$endent u$o$ressure or tem$erature o the fuid"


10/14


11/14

/icture 0 1 T($e o Thermal Flow meter


12/14

0" &ow to use Thermal Mass

Flowmeters

mal fowmeters are most commonl( used to measure the mass fow o clean ah as air. nitroen. h(droen. helium. ammonia. aron. and other industrial astures. such as fue stack fow and !ioas fow. can !e measured when their conown"dvantae o this technolo( is its de$endence u$on thermal $ro$erties that aree$endent o as densit("mal fowmeters can !e a$$lied to clean. sanitar(. and corrosive ases where th$erties o the fuid are known"mal fowmeters are most commonl( a$$lied to measure $ure ases. such as w

d or la!orator( e,$eriments. and in semi2conductor $roduction"can also used in chemical and $etrochemical $lants when the thermal $ro$ertiare known"


13/14

3" 4ndustr( where are used"

se are used in oil and as. $ower. chemical. water and waste. metals and minid and !everae. $ul$ and $a$er. $harmaceutical and te,tile industries"


14/14

:" A$$lication Cautions or Thermal

Flowmeters

ermal fowmeters should nota$$lied to a!rasive fuidscause the( can damae the

nsor"

=ar(in the $ercentae o certaincom$onents that have di+erentthermal$ro$erties rom cali!rated values cancause

thermal fowmeters to !ecome hihl(

Aerosols and ases with dro$lets cacause thermal fow meters to !ecoerratic and6or measure ull scale fo

This is !ecause the lare amount othermal ener( used to heat the li5is inter$reted as a hih fow sinal"

O$eratin a thermal fowmeter a!ove itma,imum fow rate will enerall( notdamae the fowmeter !ut can causemeasurement error !ecause its cali!raticurve can !ecome un$redicta!le"

Documents

Mass Flowmeter