blueberry - Data Logger
From Data Loggers
blueberry COMPACT is our standard data logger for wind site assessment, solar site assessment and meteorological stations. Data transmission via GSM/GPRS provides permanent control over your measurement. Virtually any sensor type connects directly to blueberry COMPACT. There is no need for amplifiers or signal converters für Pt100, thermopile pyranometers or low level AC anemometers. All terminals are protected against overvoltage. The integrated web interface provides local connection by a browser as well as global connection via Internet. blueberry COMPACT transmits measured data via eMail, FTP and RSYNC. Alarm messages are automatically sent via eMail.
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Product Details
A wind measurement station consists of the following components:
Anemometer
Cup anemometers measure the horizontal wind speed. In order to determine the vertical wind profile, wind speed is measured at a minimum of two or three different levels. The determined profile exponent is used to extrapolate the wind climate to hub height of the wind turbine.
The power of the wind flow increases proportional to the cube of the wind speed. An error in measurement of 5% for the wind speed results in an error of 15% for the energy yield. This underlines the importance of accurate wind speed measurements. The following aspects have to be considered when selecting the anemometers:
- It is recommended to use high quality anemometers. The saving of money does not in the least justify the financial risk caused by a wrong prognosis of the energy yield due to cheap anemometers.
- An individual wind tunnel calibration increases the accuracy of anemometers. DKD (Deutscher Kalibrierdienst) or MEASNET certified institutes guarantee a maximum of accuracy and comparability.
Wind vane
Information about the wind direction is usually required for the alignment of the wind turbines in a wind farm in order to minimize the wake losses. The wind direction is usually measured near the top of the mast. Potentiometric wind vanes are suitable for long-term measurements because of their high resolution and their low power consumption.
Temperature and barometric pressure sensor (optional)
The wind energy flow is proportional to the density of the air which is calculated from temperature and air pressure. The measurement of air temperature and barometric pressure improves the prognosis of the energy yield. IEC (International Electrotechnical Commission) recommends a cumulative accuracy of +/- 1%.
Data logger
All measured values are recorded by the wilog303/306 data logger. The preevaluated data are stored as time series. Additionally, recent measured data are indicated on the LCD.
Shelter box
A steel shelter box protects the data acquisition system against weather, theft, and vandalism.
GSM modem (optional)
The measured data stored in the wilog303/306 data logger are read out locally via notebook or pocket PC. Optionally, a GSM modem connected to the data logger allows remote data transmission to any PC with telephone modem.
Solar power supply (optional)
An external power supply for small wind measuring stations is not required. Data logger, anemometers, and wind vanes are supplied from the internal batteries of the wilog303/306 data logger. However, some sensors as well as GSM modems require a 12 Volt power supply. An autonomous power supply of the entire system is realized by means of a photovoltaic solar system.
Measuring mast
Sensors are placed at different heights on the measuring mast. The complexity of the terrain and the hub heights of the planned wind turbines determine the mast height. A complex terrain requires higher measuring levels in order to obtain reliable data. Measurements in hub height provide the most accurate results. However, a minimum mast height of 40m is recommended.
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