part 2 basic principle
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7/23/2019 Part 2 Basic Principle
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Analysen- und Prozessmesstechnik Sales Presentation FLOWSIC 600 March 00! Seite "
Part "# Introduction
Part # $asic Princi%lePart &# Product ran'e
Part (# Meter Com%onents
Part !# A%%lications and )e*erences
Part 6# Cali+ration
Part ,# eneral System Con*i'uration
Contents
7/23/2019 Part 2 Basic Principle
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Analysen- und Prozessmesstechnik Sales Presentation FLOWSIC 600 March 00! Seite
t. / trael time *rom A to $
L / measurin' line len'th 1 / measurin' line an'le
C / elocity o* sound di / inside diameter
m / mean2 uncorrected 'as elocity
t3 / trael time *rom $ to A
ϕdi 4m/0
L
0
0
t
C
Lt t
v
U D
m
===
=
A+solute .i'ital 5rael 5ime Method "7
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t. / trael time *rom A to $ t3 / trael time *rom $ to A
L / measurin' line len'th 1 / measurin' line an'le
C / elocity o* sound di / inside diameter
m / mean2 uncorrected 'as elocity
)( vC
L =t
m
Dϕ cos⋅+
)( v-C
L =t
m
U
ϕ cos⋅
⋅
⋅ t
1 -
t
1
)( 2
L =v
baab
mϕ cos
ϕ
di m≠0
L
A+solute .i'ital 5rael 5ime Method 7
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080"
08"
"
"0
"00 "000 "0000
Velocity of Sound [m/s]
D e n s i t
y [ k g / m 3 ]
.ensity s8 4elocity-o*-Sound
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In*luence o* 5em%eratureariation o* 4elocity-o*-Sound 9ith tem%erature7
&:!
&;0
&;!
(00
(0!
("0
("!
(0
0 "0 0 &0 (0 !0 60 ,0
Pressure [bar]
V e l o c i t y - o f - S o u n d [ m / s ]
0 de' C ! de' C &0 de' C
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&,0
&:0
&;0
(00
("0
(0
(&0
,: :& :: ;&
% Methane
V e l o c i t y - o f - S
o u n d [ m / s ]
In*luence o* Com%osition
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no!ledge is re"uired about the #lo! Velocity Profile
V $ k Vm
&
'
Vm4Vk
Wei'hin' Factor k
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...=
t
1-
t
1Ak
2cos ϕ
LQ
UD
( )nreliability in kno!ing the e*act +nstallation Parameters
, +naccuracy of the #lo! Meter +nstrument .rror
11
2 UD tt
LC
+.=
.= t
1
-t
1
2cos ϕ
L
vmUD
Accuracy
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S9irl # 4elocity %er%endicular on %i%e a<is
=**ects# no in*luence on total *lo92 +ut in*luence on time measurement
Vm
Vs!irl
S9irl
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Double out-of-lane 'end
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Double out-of-lane bends
> Considered 9orst case
> Creates %ro*ile distortion
> Creates s9irl
> )educes accuracy o* k-Factor
4elocity Pro*ile .istortion "7
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0ther Sources
> Pi%e diameter chan'es
> 4ales
> =l+o9s
>5ee sections
> S%iral 9elded %i%e
4elocity Pro*ile .istortion 7
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4elocity Pro*ile .istortion &7
1hat to do2
> Well selected measurement %oint
> Strai'ht len'th u%stream o* meter
> Flo9 conditioner
> Flo9 %ro*ile determination
> S9irl detection ? com%ensation
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> Measurin' Line Len'th M)$7
⇒ L
> Inner .iameter S%ool M)$7 ⇒ A
> Measurin' An'les M)$7 ⇒ ϕ
> Wall )ou'hness o* S%ool M)$7 ⇒ k
Installation Parameters L2 A2 ϕ and k
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4D
tanδtCδV
2ϕ ⋅⋅
= !ith $ 45 this results in
Instrument =rror
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-3
-,
-(
4
(
,
3
4 6 (4 (6 ,4 ,6 34
4elocity @m?s
r e l a t i 0 e =
r r o r @ B A
-44,
-44(6
-44(
-4446
4
4446
44(
44(6
44,
a + s o l u t e = r r o r @ m ? s A
A+solute s8 )elatie =rror
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Cali+ration ra%h Mi Wester+ork7
7alibration 7ur8e
-800
-"8!0
-"800
-08!0
0800
08!0
"800
"8!0
800
0 "0 0 &0 (0 !0 60 ,0 :0 ;0 "00
#lo! 9ate :%;
. r r o r : %
;
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> Intrinsically hi'h accuracy
> Sta+le cali+ration oer 9ide measurin' ran'e
> )e%eata+ility under actual o%eratin' conditions
> Sensitiity - een at lo9 *lo9 ran'ea+ility
> 59o-9ay tra**ic> =asy to im%lement
> )elia+le
> )esistance to 9ear or chan'e o* cali+ration
$ene*its o* .i'ital 5rael 5ime Method "7
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> Fast res%onse
> )u''ed
> .ynamic eri*ication 9?C
> o %ressure dro%
> Lo9 cost-o*-inestment2 lo9 cost-o*-o9nershi%> A+ility to identi*y *lo9 direction
> Can +e ada%ted to actual site conditions
> Can +e ada%ted to actual 'as conditions
$ene*its o* .i'ital 5rael 5ime Method 7
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