ultrasonic flowmeter instrument

© 2012 by Elster. All rights reserved.

Training Course

24-11-2014

Q.Sonic Ultrasonic Gas Meter


Introduction

• Timo Smits

• Age 50

• Joined April 1st 1992

• 22 years experience with ultrasonic flowmeters

‒ Product Specialist (Stork Servex)‒ Project Engineer UFM (Instromet)‒ Sales Engineer UFM (Elster-Instromet)‒ Applications Engineer UFM

2


University of Ultrasonics

3

Elster-Instromet

Let’s

Talk

Ultrasonic!


Principle of Operation

4


History of ultrasonic flow meters

5

Elster-Instromet


History of Elster-Instromet in ultrasonics

• 1980: Open water measurement

• 1985: Development ultrasonic gas flow meter GasSonic (hot-tap)

• 1992: Development fiscal gas flow meter Q.Sonic (multi-path)

• 1995: Q.Sonic approved for custody transfer (NMi, PTB)

• 2000: Compact meter

• 2004: Coded multiple burst

• 2008: Titanium full metal transducer

• 2012: Q.Sonicplus

6

Elster-Instromet

Ultrasonic expertise for more than 25 years:


History of Elster-Instromet in ultrasonics

7

Elster-Instromet

GasSonic installation at Gasunie (NL)


Ultrasonic measurement technique

8

Elster-Instromet

Sometimes you have the wind behind

Sometimes you have the wind against

The time difference is a measure for the storm



9

Elster-Instromet

Absolute travel time measurement (1)



10

Elster-Instromet

Absolute travel time measurement (2)


Ultrasonic measuring principle

11

Elster-Instromet

cc

v

v·cosϕ

⋅ t

1 -

t

1

2

L = v

baab

mϕcos

DiL

ϕ

Trd B

Trd A

send

receive

ϕcos⋅− v c

L = tba

ϕcos⋅v + c

L = tab

receive

send

v: average gas velocity

c: velocity of sound (VOS)



12

Elster-Instromet

/h][m360011

cos23 A

tt) (

L Q

baabL ⋅⋅

−⋅⋅

=ϕ

/h][m3600 3 A Vm QL ⋅⋅=

Mechanical dimensionmeasurement

QL calculation based on:

• Area (~diameter)

• Path angle

• Path length

• Travel time measurement



13

Elster-Instromet

[m/s]tt

LC

baab

+= 11

2ϕcos⋅− v c

L = tba

Velocity of sound (VOS)

ϕcos⋅v + c

L = tab


Path configurations

14

Elster-Instromet

Direct Single Reflection

Double Reflection

Axial

Swirl

C.W.

C.C.W.


Path configurations

15

Elster-Instromet

CheckSonic-1 : 1111

CheckSonic-2: 1111 4444

Q.Sonic-3 : 1111 2222 3333

Q.Sonic-4 : 1111 2 2 2 2 3333 4444

11111111 41111

2 3

1111 4

2 3

Elster-Instromet “compact” path matrix


Animation Q.Sonic

16

Elster-Instromet


Animation Q.Sonic-4 compact

17

Elster-Instromet


Patent

European Patent Specification:

On December 3, 1997

the Q.Sonic® matrix

was patented

18

Elster-Instromet


Flow Profile (low velocity)

19

Elster-Instromet


Flow Profile (high velocity)

20

Elster-Instromet


Flow Profile

• Elster-Instromet

21

Elster-Instromet

Low velocity High velocity


Flow Profile (Reynolds number)

22

Elster-Instromet

Low Re number High Re number��

�. �. �

�


Flow Profile Correction

23

Elster-Instromet

Vraw

Vcorr

=

Vraw x kRe

Re (= Vraw ⋅ c)

k

Profile Correction Curve

• Curve is formed by the Profile Correction Coefficients in the Flowmeter Setup

• Real time


Q.Sonic specifications

24

Elster-Instromet

• Diameter

• Pressure range

• Temperature range

• Maximum gas velocity

• Uncertainty

• Repeatability

• Hazardous area approval

• Interfaces

• 4” - 64” (100 mm – 1600 mm)

• 4 bar – 150 bar standard

• 1 bar – 480 bar extended

• -20oC - +80oC standard

• -50oC - +120oC extended

• 32 m/s (bi-directional)

• ≤±0.3% flow calibrated

• ≤±0.2% flow calibrated including inlet spool & FS

• ≤±0.05%

• ATEX II 2 G, Zone 1, gas group IIA, IIB or IIC

• RS485 (2x)

• RS232 (2x)

• Digital/pulse (4x)


Coded multiple burst (CMB) technology

25

Elster-Instromet

Single burst Coded Multiple Burst


Coded multiple burst (CMB) technology

• burst signal instead of a single pulse

• time coded sequence of bursts

• efficient usage of UFM operating time (no delay)

• Improved signal-to-noise ratio which decreases the sensitivity

to regulator noise and low signal applications

• cross-over interference between two adjacent meters can be

minimized

26

Elster-Instromet


Attenuation of sound

27

Elster-Instromet

There are several effects that affect the amplitude of an acoustic wave when it is transmitted through a medium:

1. Transmission into the medium

2. Diffraction (spreading)

3. Absorption within the medium

4. Reflection effects

5. Ultrasonic beam drift

6. Transducer efficiency

32

1

4

6

5


Dry Calibration

Physical Dimension Check

28


Dry calibration (physical dimensional check)

29

Elster-Instromet

P

T

100%

N2

V.o.S. (Cc) calculated

V.o.S. (Cm) measured

Lpath

EEx(d)

measured

oldpathcalculatednewpath C

LCL )(

)(

⋅=


Calibration

30


UFM Calibration to National Standard

31

Elster-Instromet

Reference :Turbine Meter

Test :Ultrasonic Meter

Gas Flow

QL [m3/h]P [bar]T [°C]


Error calculation


UFM Calibration to National Standard

32

Elster-Instromet

• If Qi/Qmax = 1, then 0.4

∑

∑

=

=

⋅= n

i

i

n

ii

i

Q

Q

errorQ

Q

WME

1 max

1 max

OIML / WME = Weighted Mean Error

Adjusting FinalFactor in UFM


Verification measurement


Calibration certificate

33

Elster-Instromet

Unique identification of calibration certificate (on all pages)



34

Elster-Instromet

Measurement deviationafter correction

Calibration uncertainty



35

Elster-Instromet

Adjust Factor : 0.9969(WME = +0.31%)


Calibration standards

• AGA 9• ISO 17089-1

36

Elster-Instromet


Thank youTimo Smits

Title

[email protected]

ultrasonic flowmeter instrument

Documents

history of elster

sonic ultrasonic gas

animation q

sonic multipath

open water measurement

compact meter

average gas velocityc

wind behindsometimes