Gill Instruments: environmental & industrial monitoring solutions

Technical Key Note

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Key Note Series Number KN1803

Subject Gill Products Meet MEASNET

Applicable models WindObserver / WindMaster / WindMasterPro

Date: 27th November 2015 Introduction 2-axis and 3-axis wind measurement is important within the wind energy market. Wind speed data is used to determine the power curve for the wind turbines at the installation site and 3-axis axis data is used to determine the wind characteristics at the site before, during and after installation of turbines. Ultrasonic Solution We are pleased to confirm that both the WindObserver and the WindMaster/WindMasterPro have met the MEASNET requirements for “linearity” and we can provide example certificates (attached). As MEASNET requires an individual certificate for each sensor we can assist with providing these via SOH in Denmark, SOH in the USA or DWG in Germany. Further Work for MEASNET During 2016 the MEASNET requirements will change to include ultrasonic for 2D measurement and a requirement to provide the vertical component. Gill will have WindSonic, WindObserver and WindMaster/WindMasterPro tested to provide a classification as soon as possible. About MEASNET MEASNET is a co-operation of companies which are engaged in the field of wind energy and want to ensure high quality measurements, uniform interpretation of standards and interchangeability of results. The members established an organizational structure for MEASNET and perform mutual and periodical quality assessments for their harmonized measurements and evaluations. The highest tier is the Council of Members. An Executive Board, composed of three representatives from different members executes the tasks delegated by the Council of Members. Several Expert Groups, specializing in certain measurement tasks, advise and support the Executive Board and the Council of Members on the definition of the measurement procedures. Assessment Teams are established to perform assessments for the admission of new members and for the periodical quality confirmations of MEASNET members. All MEASNET members must be accredited by ISO/IEC 17025 for the MEASNET approved measurements.

Gill Instruments: environmental & industrial monitoring solutions

Technical Key Note

Page 2 of 2 Contact us for more information - www.gillinstruments.com or +44 1590 613500

MEASNET certification has always been required for instrumentation used at wind turbine sites where the data is being used by the financial institutions that are backing the site. However, only cup anemometers are currently classified under MEASNET. These cups have under gone the extensive proving process to obtain a classification and then each individual cup has a “linearity” check under MEASNET before and after installation. However, there are shortfalls with cups as they are a mechanical sensor and so the market is moving to include ultrasonic sensors so that the advantages of no maintenance and increased robustness can be used.

Deutsche WindGuardWind Tunnel Services GmbH, Varel

accredited by the / akkreditiert durch die

Deutsche Akkreditierungsstelle GmbHas calibration laboratory in the / als Kalibrierlaboratorium im

Deutschen Kalibrierdienst

Calibration certificate Calibration markKalibrierschein Kalibrierzeichen

1522514

08/2015

D-K-15140-01-00

ObjectGegenstand

2D Sonic Anemometer

ManufacturerHersteller

Gill InstrumentsUK-Hampshire S041 9EG

TypeTyp

1390-65-B-124

Serial numberFabrikat/Serien-Nr.

1522054

CustomerAuftraggeber

Gill InstrumentsUK-Hampshire S041 9EG

Order No.Auftragsnummer

M42664

Project No.Projektnummer

VT150705

Number of pagesAnzahl der Seiten

5

Date of CalibrationDatum der Kalibrierung

04.08.2015

This calibration certificate documents thetraceability to national standards, which realizethe units of measurement according to theInternational System of Units (SI).The DAkkS is signatory to the multilateralagreements of the European co-operation forAccreditation (EA) and of the InternationalLaboratory Accreditation Cooperation (ILAC) forthe mutual recognition of calibration certificates.The user is obliged to have the objectrecalibrated at appropriate intervals.Dieser Kalibrierschein dokumentiert die Rück-führung auf nationale Normale zur Darstellungder Einheiten in Übereinstimmung mit demInternationalen Einheitensystem (SI).Die DAkkS ist Unterzeichner der multilateralenÜbereinkommen der European co-operation forAccreditation (EA) und der InternationalLaboratory Accreditation Cooperation (ILAC) zurgegenseitigen Anerkennung der Kalibrierscheine.Für die Einhaltung einer angemessenen Frist zurWiederholung der Kalibrierung ist der Benutzerverantwortlich.

This calibration certificate may not be reproduced other than in full except with the permission of both the GermanAccreditation Body and the issuing laboratory. Calibration certificates without signature are not valid. This calibrationcertificate has been generated electronically.Dieser Kalibrierschein darf nur vollständig und unverändert weiterverbreitet werden. Auszüge oder Änderungen bedürfen derGenehmigung sowohl der Deutschen Akkreditierungsstelle als auch des ausstellenden Kalibrierlaboratoriums. Kalibrierscheineohne Unterschrift haben keine Gültigkeit. Dieser Kalibrierschein wurde elektronisch erzeugt.

DateDatum

Head of the calibration laboratoryLeiter des Kalibrierlaboratoriums

Person in chargeBearbeiter

04.08.2015

Dipl. Phys. Dieter Westermann Heiko Westermann, B. Sc.

Page 2 / 5Seite

Deutsche WindGuardWind Tunnel Services GmbH, Varel

1522514

08/2015

D-K-15140-01-00

Calibration objectKalibriergegenstand

2D Sonic Anemometer

Calibration procedureKalibrierverfahren

• Deutsche WindGuard Wind Tunnel Services: Calibration of anemometers;Version 1.0 (2014)Based on following standards:• MEASNET: Anemometer calibration procedure• IEC 61400-12-1: Power performance measurements of electricity producingwind turbines• IEC 61400-12-2: Power performance of electricity producing wind turbinesbased on nacelle anemometry• ISO 3966: Measurement of fluid in closed conduits• ISO 16622: Meteorology - Sonic anemometers/thermometers

Place of calibrationOrt der Kalibrierung

Windtunnel of Deutsche WindGuard WindTunnel Servies GmbH, Varel

Test conditionsMessbedingungen

wind tunnel area 10000 cm²

anemometer frontal area 220 cm²

diameter of mounting pipe 50 mm

blockage ratio 1) 0.022 [-]

software version 7.641) Due to the special construction of the test section no blockage correction is necessary.

Ambient conditionsUmgebungsbedingungen

air temperature 25.2 °C ± 0.1 °C

air pressure 1012.0 hPa ± 0.3 hPa

relative air humidity 59.7 % ± 2.0 %

Measurement uncertaintyMessunsicherheit

The expanded uncertainty assigned to the measurement results is obtained bymultiplying the standard uncertainty by the coverage factor k = 2. It has beendetermined in accordance with DAkkS-DKD-3. The value of the measurand lieswithin the assigned range of values with a probability of 95%.The reference flow speed measurement is traceable to the German NMI(Physikalisch-Technische Bundesanstalt) standard for flow speed. It is realizedby using a PTB owned and calibrated Laser Doppler Anemometer (StandardUncertainty 0.2 %, k=2)

Latest accreditationLetzte Akkreditierung

04/2014

Additional remarksZusätzliche Anmerkungen

Orientation: 45 deg

Page 3 / 5Seite

Deutsche WindGuardWind Tunnel Services GmbH, Varel

1522514

08/2015

D-K-15140-01-00

Calibration resultKalibrierergebnis

Sensor speed Sensor dir Tunnel speed Uncertainty (k=2)

m/s deg m/s m/s

3.907 45.000 3.957 0.050

5.787 45.000 5.902 0.050

7.779 45.000 7.982 0.050

9.749 45.000 9.979 0.050

11.751 45.000 12.035 0.050

13.566 45.000 13.955 0.050

15.561 45.000 15.980 0.050

14.603 45.000 15.017 0.050

12.677 45.000 13.019 0.050

10.703 45.000 10.971 0.050

8.801 45.000 8.989 0.050

6.848 45.000 6.993 0.050

4.802 45.000 4.908 0.050

File: 1522514

Linear regression analysis Slope 1.03201 (m/s)/(m/s) ±0.00131 (m/s)/(m/s)

Offset -0.0690 m/s ±0.014 m/s

Standard error (Y) 0.018 m/s

Correlation coefficient 0.999991

Remarks The calibrated sensor complies with thedemanded linearity of MEASNET

Page 4 / 5Seite

Deutsche WindGuardWind Tunnel Services GmbH, Varel

1522514

08/2015

D-K-15140-01-00

Graphical representation of the resultGrafische Darstellung des Ergebnises

Photo of the measurement setupFoto des Messaufbaus

Remark: The proportions of the set-up may not be true to scale due to imaging geometry.

Page 5 / 5Seite

Deutsche WindGuardWind Tunnel Services GmbH, Varel

1522514

08/2015

D-K-15140-01-00

Sensor config during calibrationSensorkonfiguration während der Kalibrierung

D1

D

E522054

D1

D2

D

6.05.

D2

D3

D)current configuration :

A0 B3 C1 E1 F1 G0000 J1 K1 L1 M2 NA O1 P1 T1 U1 V1 X1 Y1 Z1

D3

D7

DRD

Deutsche WindGuardWind Tunnel Services GmbH, Varel

accredited by the / akkreditiert durch die

Deutsche Akkreditierungsstelle GmbHas calibration laboratory in the / als Kalibrierlaboratorium im

Deutschen Kalibrierdienst

Calibration certificate Calibration markKalibrierschein Kalibrierzeichen

1522485

07/2015

D-K-15140-01-00

ObjectGegenstand

3D Sonic Anemometer

ManufacturerHersteller

Gill InstrumentsUK-Hampshire S041 9EG

TypeTyp

1590-PK-020

Serial numberFabrikat/Serien-Nr.

Y152201

CustomerAuftraggeber

Gill InstrumentsUK-Hampshire S041 9EG

Order No.Auftragsnummer

M42664

Project No.Projektnummer

VT150742

Number of pagesAnzahl der Seiten

5

Date of CalibrationDatum der Kalibrierung

31.07.2015

This calibration certificate documents thetraceability to national standards, which realizethe units of measurement according to theInternational System of Units (SI).The DAkkS is signatory to the multilateralagreements of the European co-operation forAccreditation (EA) and of the InternationalLaboratory Accreditation Cooperation (ILAC) forthe mutual recognition of calibration certificates.The user is obliged to have the objectrecalibrated at appropriate intervals.Dieser Kalibrierschein dokumentiert die Rück-führung auf nationale Normale zur Darstellungder Einheiten in Übereinstimmung mit demInternationalen Einheitensystem (SI).Die DAkkS ist Unterzeichner der multilateralenÜbereinkommen der European co-operation forAccreditation (EA) und der InternationalLaboratory Accreditation Cooperation (ILAC) zurgegenseitigen Anerkennung der Kalibrierscheine.Für die Einhaltung einer angemessenen Frist zurWiederholung der Kalibrierung ist der Benutzerverantwortlich.

This calibration certificate may not be reproduced other than in full except with the permission of both the GermanAccreditation Body and the issuing laboratory. Calibration certificates without signature are not valid. This calibrationcertificate has been generated electronically.Dieser Kalibrierschein darf nur vollständig und unverändert weiterverbreitet werden. Auszüge oder Änderungen bedürfen derGenehmigung sowohl der Deutschen Akkreditierungsstelle als auch des ausstellenden Kalibrierlaboratoriums. Kalibrierscheineohne Unterschrift haben keine Gültigkeit. Dieser Kalibrierschein wurde elektronisch erzeugt.

DateDatum

Head of the calibration laboratoryLeiter des Kalibrierlaboratoriums

Person in chargeBearbeiter

17.08.2015

Dipl. Phys. Dieter Westermann Dipl.-Ing. (FH) Catharina Herold

Page 2 / 5Seite

Deutsche WindGuardWind Tunnel Services GmbH, Varel

1522485

07/2015

D-K-15140-01-00

Calibration objectKalibriergegenstand

3D Sonic Anemometer

Calibration procedureKalibrierverfahren

• Deutsche WindGuard Wind Tunnel Services: Calibration of anemometers;Version 1.0 (2014)Based on following standards:• MEASNET: Anemometer calibration procedure• IEC 61400-12-1: Power performance measurements of electricity producingwind turbines• IEC 61400-12-2: Power performance of electricity producing wind turbinesbased on nacelle anemometry• ISO 3966: Measurement of fluid in closed conduits• ISO 16622: Meteorology - Sonic anemometers/thermometers

Place of calibrationOrt der Kalibrierung

Windtunnel of Deutsche WindGuard WindTunnel Servies GmbH, Varel

Test conditionsMessbedingungen

wind tunnel area 10000 cm²

anemometer frontal area 220 cm²

diameter of mounting pipe 50 mm

blockage ratio 1) 0.022 [-]

software version 7.641) Due to the special construction of the test section no blockage correction is necessary.

Ambient conditionsUmgebungsbedingungen

air temperature 23.2 °C ± 0.1 °C

air pressure 1019.4 hPa ± 0.3 hPa

relative air humidity 57.6 % ± 2.0 %

Measurement uncertaintyMessunsicherheit

The expanded uncertainty assigned to the measurement results is obtained bymultiplying the standard uncertainty by the coverage factor k = 2. It has beendetermined in accordance with DAkkS-DKD-3. The value of the measurand lieswithin the assigned range of values with a probability of 95%.The reference flow speed measurement is traceable to the German NMI(Physikalisch-Technische Bundesanstalt) standard for flow speed. It is realizedby using a PTB owned and calibrated Laser Doppler Anemometer (StandardUncertainty 0.2 %, k=2)

Latest accreditationLetzte Akkreditierung

04/2014

Additional remarksZusätzliche Anmerkungen

Orientation: 180°

Page 3 / 5Seite

Deutsche WindGuardWind Tunnel Services GmbH, Varel

1522485

07/2015

D-K-15140-01-00

Calibration resultKalibrierergebnis

Sensor v_hor Sensor dir Sensor v_vert Tunnel speed Uncertainty (k=2)

m/s deg m/s m/s m/s

3.948 180.787 -0.010 3.953 0.050

5.876 180.169 -0.022 5.893 0.050

7.869 180.363 -0.026 7.890 0.050

9.809 180.506 -0.025 9.842 0.050

11.796 180.825 -0.023 11.848 0.050

13.701 180.831 -0.015 13.769 0.050

15.650 181.000 -0.002 15.739 0.050

14.714 180.963 -0.006 14.803 0.050

12.749 180.975 -0.022 12.817 0.050

10.761 180.688 -0.026 10.813 0.050

8.840 180.525 -0.025 8.878 0.050

6.889 180.131 -0.024 6.919 0.050

4.880 180.381 -0.017 4.903 0.050

File: 1522485

Linear regression analysis Slope 1.00687 (m/s)/(m/s) ±0.00056 (m/s)/(m/s)

Offset -0.0224 m/s ±0.006 m/s

Standard error (Y) 0.008 m/s

Correlation coefficient 0.999998

Remarks The calibrated sensor complies with thedemanded linearity of MEASNET

Page 4 / 5Seite

Deutsche WindGuardWind Tunnel Services GmbH, Varel

1522485

07/2015

D-K-15140-01-00

Graphical representation of the resultGrafische Darstellung des Ergebnises

Photo of the measurement setupFoto des Messaufbaus

Remark: The proportions of the set-up may not be true to scale due to imaging geometry.

Page 5 / 5Seite

Deutsche WindGuardWind Tunnel Services GmbH, Varel

1522485

07/2015

D-K-15140-01-00

Sensor config during calibrationSensorkonfiguration während der Kalibrierung

D1

D1

Y152201

D2

D2

2329-601-03

D3

D3

M2,U1,O1,L1,P5,B4,H1,NQ,E1,T1,S1,C2,A1,I1,J1,V1,X1,G0,K50,

D7

D7

NO DAC AVAILABLE