Calibration Concept Phil.
Transcript of Calibration Concept Phil.
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
E + H Flow meters …………..
JA Salusbury
Slide 2
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 3
What are we talking about
Flowmeter Accuracy
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 4
Accuracy and Repeatability
A B
DC
High accuracy = good repeatability (A), but good repeatability does not necessarily mean high accuracy (C)!
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 5
0
2
4
6
8
10
0 2 4 6 8 10
Meter reading
Ref
eren
ce re
adin
g
Zero offset
gain error
ideal output
Calibration does matter
Calibration Definition:
Calibration is the comparison of a meter with a well know reference (calibration rig) and if necessary adjustment in order to obtain a correct reading.
Compensate for:• Zero offset
• Gain error
For proper, credible calibration you need to have a good reference
=> The rig must be accredited
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 6
E+H Flow meter specifications (acc. to standards)
=
Accredited calibration capabilitymeter capabilityspecified accuracy
+
This means meter accuracy can never be better than calibration capability!!!
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 7
Accreditation, What‘s it all about
Accreditation is the formal recognition of nationalgovernmental authority to execute a specific service
Examples of Accredition Bodies are:
METAS (Switzerland), NMI (Holland), A2LA (USA)
Accredited organinsations may be:
material testing labs (TÜV, Lloyds etc.) or even private companies
The Procedures for Laboratory Accreditation are defined in ISO17025
Endress+Hauser Flowtec is accredited as a flow calibration laboratory by METAS and A2LA
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 8
Accreditation, What’s it all about
Accreditation is the key to transparency, confidence and comparability and it should eliminate international trade barriers.
Together with the accrediting body the uncertainty and traceability of the measuring chain is established
Measuring uncertainty claims coming from non accredited calibration rigs are generally regarded as not credible.
E+H aims to have technical solutions (specs) and accreditations based on ISO 17025, in all production and service centers world wide!
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 9
Calibration Methods
Primary Calibration Secondary Calibration
Weight scale Flying-Start-Stop (diverter)
Master meter
Weight scale Standing-Start-Stop (inferior)
Secondary methods inherently have higher uncertainties than any primary calibration method. Reproducibility of master does add to uncertainty.
ISO 4185: Standard for calibration with gravimetric references
Factory Calibration
Mobile Calibration
Calibration Management
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 10
State of the art, Gravimetric/Flow diverter (Primary)
Constant Flowrate
Water - Reservoir
UUT =unit under test
weighing tank
Flow Diverter
Freq
uenc
y
kg
START
STOP
oC
ComputerComputer
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 11
Master Cal. (Secondary Calibration)
Water - Reservoir
UUT
Mas
ter
Ger
äte
Constant flow
oC
START
STOPComputer
Freq
uenc
yFr
eque
ncy
Freq
uenc
yFr
eque
ncy
time&temp.
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 12
Water Tower with Overflow (Cernay)
Tower-Tank25 m3
Edge
of o
verf
low
= 2
3,9
m
Q Max. 1650 l/s
Main-water-reservoir 1‘300 m3 total
Dev
ice
unde
r te
st
Constant overflow = stableconditions at the location of
the DUT
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Thermal Flow
Slide 13
Calibration Rig Characteristics
Calibration with air at 1 atm.
Repeatable and stable ambient conditions
Controlled temperature and humidity
Undisturbed fully developed flow profile
Master meters: turbines, rotary pistons and sonic nozzles for various flow ranges
Max. flow rate: 10 000 kg/h
Measurement uncertainty: ±0.3 % o.r.
ISO/IEC 17025 accredited*
65F / 65I
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Thermal Flow
Slide 14
Calibration Benches
Automated positioning of the Device Under Test
Revolvers for flanged sensors DN15…100 (1/2”…4”)
Optional calibration with flow conditioner (65F sensor)
Straight pipe section for insertion sensors
Specific calibration for DN80 (3”), DN100 (4”) and ≥DN150 (6”)
65F / 65I
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Thermal Flow
Slide 15
Standard Calibration Certificate
65F / 65I
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 16
Advantages of a Water Tower with Overflow
Absolutely stable conditions during the entire calibration
No pump pulsations
No entrained air in the water
No pressure changes during calibration
No differences in compressibility of the water between DUT and scales (masters)
No regulation of the flow rate during calibration
No level measurement
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 17
Influence on calibration accuracy
Gravimetric
kg
Vol/d
How big is the influence of the surrounding air on the reading of the scales? Make a guess.
Answer: approx. 0.1%!!!
This must be compensated by the calibration rig in order for the meters to be within the specs.
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 18
Traceability chain of E+H Flowtec calibration standExample, FCP 7.2 in Cernay
FullTraceability means an uninterrupted
chain of proof regarding the test equipment, from the test device to the hierarchically
highest standard in each country
“national standard”,confirmed by an accreditation: Switzerland-Metas
Germany-PTB
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 19
The E+H way: World wide use of primary calibrations
±0,05% Total Accredited
Uncertainty
“Accredited calibration stands (ISO 17025)”in all production locations used by E+H for all
produced Coriolis meters.
≡≡ ≡
METAS A2LA Accreditation in progress
Identical technical solutions
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 20
Promass is used as „Transfer standard“ at BIPM
Because of highest accuracy and repeatability PROMASS was selected as the transfer normal for inter comparison test of national metrology institutes
Target of this inter comparison test was to determine the uncertainty of the calibration stands of these national metrology institutes.
Source: BIPM BIPM = Bureau International des Poids et Measure
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 21
Comparison of national calibration rigs
Country Institute Max. flow rate (m3/h)
Uncertainty (%)
Confident interval (%)
Korea KRISS 400 0.072 95
Japan NMIJ 3000 0.06 95
Germany PTB 2100 0,02* 95
U.K. NEL 5760 0.1 95
Mexico Cenam 720 0.12 95
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 22
ABB Stonehouse UK
Best uncertainty
0.053%
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 23
ABB Alzenau (Gas) and Göttingen
• Göttingen, ex F&P, 1,5 – 16m3/h – 0,1% 50 – 3000m3/h – 0,15% (Accred),
- 23‘000m3/h, n.A.
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 24
Siemens Flow Instruments Ltd. UK
• Nordholt (DK) 0,03 – 28 m3/h – 0,07%1,0 – 1000m3/h - 0,1 %1,0 – 1400m3/h – 0,25%
Ex Danfoss
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 25
Sensus Metering DE
Best uncertainty 0.12%
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 26
Rota Yokogawa, Wehr GE
Best uncertainty:
0.1%
03/09/2007
The Proline Concept
Calibration
Promag
Promass
Prosonic Flow
Prowirl
T-mass
DP-Flow
Calibration
Flow Measurement - Calibration E+H Philosophy
Häfelfinger/Roth
Slide 27
KEM Küppers, Karlsfeld GE
Manufacturer of Turbines, 0.1%