The NRG BP60 is a drop-in replacement for the BP20 Barometric Pressure Sensor. There are several improvements introduced in the BP60, but perhaps the most important is the introduction of native temperature-compensation.

The BP60 continuously measures the temperature of the air volume that is being sampled inside its housing by its barometric pressure sensing element and factors this internal temperature into the sensor’s barometric pressure output. The temperature sensing element has a very low thermal mass, which allows it to react to changes in internal temperature almost immediately.

The performance improvement can be dramatic in situations with rapid temperature swings, including diurnal cycles such as the one shown in the example below from NRG’s internal BP60 field test. At the beginning and end of the time series, the BP20 (dashed yellow) agrees with the cohort of three BP60s fairly closely (approx. ± 1 hPa). However, during the daytime, there is a pronounced divergence, with the BP20 reading approximately 5 hPa higher than the BP60s as the temperature increases about 20°C over a five-hour period, from just over 2° to 22°C (solid teal). The BP60 cohort continues to read within ± 0.5 hPa throughout the same period.

The BP60’s onboard temperature compensation improves the sensor’s overall measurement accuracy relative to the legacy BP20, enabling improved estimates of future air density and annual energy production, and more reliable forecasts on operational solar and wind farms as well as in general meteorology use cases.

Please contact sales@nrgsystems.com to learn more about this exciting new sensor.

The AQ510 is the new generation of portable Sodar systems. It’s developed with more than 40 years of experience, and is the first to be verified against traditionally anemometry in the manufacturing process. That gives you reliable and high data availability in any climate with just the flick of a switch.

With three fixed horns it uses sound to measure the wind speed, wind direction and turbulence. In any environment and any weather condition, every five meters between 40 and 200 meters. Wherever you want, any time of the year.

The modular energy system concept needs minimal attendance and lets you operate without any permits, sub-contractors or additional constructions.

With the power pack and heating options, the AQ510 gives you a cost effective solution for any climate and any site. As of now AQSystems can provide four different power solutions depending on your needs.

AQ510 Wind Finder is Now Fully Classified According To IEC Standard 61400-12-1:2017

On the 3rd of March 2017 IEC 61400-12-1:2017 was published. This new release of the standard covers the use of ground based remote sensing devices (RSDs), Sodars and Lidars, which are capable of providing accurate and consistent wind data. AQSystem believes that this will have a significant influence on future wind resource assessment methodology and the instrumentation that is chosen for different wind industry applications.

The classification process, as defined in the standard, provides a formally agreed and accepted method to assess and calculate uncertainties for remote sensing instruments thus enabling a uniform practice for using generated data in a project environment.  

To classify a product per the standard it must be validated for accuracy, unit to unit consistency and in addition to this, the performance in different environmental and seasonal conditions. These test results provide the base for the calculations and ultimately resulting in the standard uncertainty that should be applied for the specific product.

AQ510 – Validation, Calibration and Classification

AQ510 is a very well proven technology with independent validation reports from DNV-GL, Ecofys and BBB Umwelttechnik.

In addition to independent validations every AQSystem Sodar is calibrated against AQSystem’s own 100m IEC compliant met tower in Sweden prior to delivery to a customer. AQ510 is the only Sodar which has this level of testing before delivery. The methodology and test site used for calibration have been approved by DNV-GL. The process has been in place since 2013 and 160 units have now been calibrated. In addition to this; 53 units have been recalibrated with excellent results proving the robustness of both products and process.

Largely due to a recommendation by DNV-GL and to give greater confidence to the customers, AQSystem chose to exceed the minimum testing requirements to give a clearer understanding of the impact of various environmental parameters. Four AQ510s with six deployments were used in the classification process with a total measurement period of twenty-six months. One system covered a whole year to provide information on how environmental parameters affect AQ510 measurements through all four seasons.  

Conclusion and Results

The large data base of over 96.000 10-min data points from the four AQ510s enables a highly robust classification. All systems show similar sensitivities to each environmental parameter and deliver a standard uncertainty close to one another, proving the robustness of AQ510 as an RSD. With longer measurements the standard uncertainty reduces further which should be considered by AQ510 users when deciding the duration of a Sodar measurement campaign.

AQ510 has been classified according to the procedure described in Annex L of the IEC guidelines, 61400-12-1, and achieved a mean standard uncertainty of 1,00% at 100m.

 Mean standard uncertainties at different measurement heights (according to IEC standard)

The results obtained have been assessed and independently verified by Uppsala University. Uppsala University of Sweden is one of Europe’s leading technical universities.