El CSAT3 es un anemómetro sónico de tres dimensiones que mide las tres componentes ortogonales del viento y la temperatura del aire (por medio de la velocidad de los ultrasonidos). En los sistemas "eddy covariance", mide las fluctuaciones turbulentas del viento vertical y horizontal. Estas medidas se utilizan para calcular el "momentum flux" y "friction velocity". Este anemómetro sónico proporciona también las medias de velocidad y dirección de viento horizontal. Incluye 7.6m de cable.Leer más
The CSAT3 has a 10 cm vertical measurement path and operates in a pulsed acoustic mode. The three orthogonal wind components (ux, uy, uz) and the speed of sound (c) are measured and output at a maximum rate of 60 Hz. Analog outputs and two types of digital outputs are provided.
Measurements can be triggered from from the CSAT3’s internal clock, the PC-generated RS-232 command, or the datalogger’s SDM command. The SDM protocol supports a group trigger for synchronizing multiple CSAT3s.
The FW05 fine wire thermocouple (12.7 μm diameter) is available as an option for fast response temperature measurements.
|Measurement Path Length||
|Path Angle from Horizontal||60°|
|Construction||Sealed sonic transducers and electronics|
|Anemometer Head Materials||Stainless-steel tubing|
|Electronics Box Materials||Cast aluminum|
|Operating Temperature Range||-30° to +50°C|
|Voltage Supply||10 to 16 Vdc|
|Digital SDM Output Signal||CSI 33.3 k baud serial interface for data logger/sensor communication. (Data type is 2-byte integer per output plus 2-byte diagnostic.)|
|Support Arm Diameter||1.59 cm (0.63 in.)|
|Transducer Diameter||0.64 cm (0.25 in.)|
|Transducer Mounting Fingers Diameter||0.84 cm (0.33 in.)|
|Cable Length||7.62 m (25 ft)|
|Anemometer Head Dimensions||47.3 x 42.4 cm (18.6 x 16.7 in.)|
|Anemometer Head Weight||1.7 kg (3.7 lb)|
|Electronics Box Dimensions||26 x 16 x 9 cm (10.24 x 6.3 x 3.54 in.)|
|Electronics Box Weight||3.8 kg (8.4 lb)|
ux, uy, uz, c
(ux, uy, uz are wind components referenced to the anemometer axes; c is speed of sound.)
|Speed of Sound||Determined from three acoustic paths; corrected for crosswind effects.|
|Measurement Rate||Programmable from 1 to 60 Hz, instantaneous measurements. Two over-sampled modes are block averaged to either 20 Hz or 10 Hz.|
|Wind Direction Accuracy||±0.7° at 1 m/s (for horizontal wind)|
|Rain||Innovative ultrasonic signal processing and user-installable wicks considerably improve the performance of the anemometer under all rain events.|
Digital RS-232 Output Signal
|Baud Rate||9600, 19200 bps|
|Data Type||2-byte integer per output plus 2-byte diagnostic|
|Number of Outputs||4|
|Voltage Range||±5 V|
|Number of Bits||12|
SDM & RS-232 Digital Outputs Reporting Range
|Full-Scale Wind||±65.535 m/s autoranging between four ranges (Least significant bit is 0.25 to 2 mm/s.)|
|Speed of Sound||300 to 366 m/s (-50° to +60°C) Least significant bit is 1 mm/s (0.002°C).|
Analog Outputs Reporting Range
|ux||±30 m s-1, ±60 m s-1|
|uy||±30 m s-1, ±60 m s-1|
|uz||±8 m s-1|
|c||300 to 366 m s-1 (-50 to +60°C)|
Analog Outputs LSB
|ux||15 mm s-1, 30 mm s-1|
|uy||15 mm s-1, 30 mm s-1|
|uz||±8 m s-1|
|c||16 mm s-1 (0.026°C)|
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
|Data Logger Model||Data Logger Operating System (OS)
or PROMs Required
|CSAT3 OS Required|
|21X||1K 6145-3, 6146-5, 10006-1||2.1 or higher|
|21X||2K 6148-5, 6149-7, 6070-64||2.1 or higher|
|CR800, CR850||All OS||3.0 or higher|
4K is a Library Special
|2.1 or higher|
|CR10X||OS 1.4 or higher||2.1 or higher|
|CR1000||All OS||3.0 or higher|
|CR23X||All OS||2.1 or higher|
|CR3000||All OS||3.0 or higher|
|CR5000||All OS||3.0 or higher|
|CR9000||2.01 or higher||2.1 or higher|
|CR9000X||All OS||2.1 or higher|
Número de FAQs relacionadas con CSAT3: 25
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The CSAT3 calibration applies a correction for transducer delay over temperature. Transducer delays cause an offset in the wind speed measurement, and to a lesser extent, an offset in the speed of sound measurement.
The CSAT3 speed of sound easement is corrected for the effects of wind blowing normal to the sonic path.
Ultrasonic anemometers are unable to make measurements if the sonic path is blocked. The path may become blocked by water that puddles on the lower transducer face or droplets that hang from the upper transducers.
The sensors used in the eddy-covariance application are not compatible with SCWin. An open-path eddy-covariance program is available for purchase as pn 18442, CRBasic Basic Eddy Covariance Program. This is the program without energy balance sensors. Also available is pn 18443, CRBasic Extended Eddy Covariance Program, with energy balance sensors. To order a custom configured program, contact the Micrometeorology Flux group for assistance.
No. The offset is a function of temperature and time. Once a year, spot-check the CSAT3 wind offset using the procedure outlined in the CSAT3 instruction manual. If the measured offset is outside the specification, return the CSAT3 to the factory for calibration. To request a returned material authorization (RMA) number, follow the steps listed on our Repair and Calibration page.
The CSAT3 can be mounted on the end of a CM202, CM203, CM204, or CM206 crossarm, using the included CM250 Leveling Mounting Kit. Alternatively, the CSAT3 can mounted to a flat horizontal surface using a 3/8-16 stainless-steel bolt.
Campbell Scientific does not offer any mounting booms or hardware that enable easy and frequent positioning of the CSAT3 sensor head. This type of hardware must be provided by the user.
Yes. The CSAT3 measurement frequency can be changed by the user. It is set by the Execution Parameter. This parameter is described in detail in the CSAT3 instruction manual in the “Datalogger Instruction Parameters” section, as well as in the “CSAT3 RS-232 Commands” section of Appendix B.
The CSAT3 is calibrated over temperature for the effects of transducer delays on the wind speed, and to a lesser extent, for the speed of sound measurements.
There is no NIST-traceable standard for ultrasonic anemometers.
Yes. The CSAT3 electronics contain unique calibration and sensor head geometry information. The sensor head and electronics are a matched set. (The serial number on the sensor head must match the electronics to make valid measurements.)
With long cable lengths, monitor the SDM data collected from the CSAT3. If the CSAT3 diagnostic word is 61441 or NAN, there are SDM communications errors. If the SDM bit period is increased, SDM communications should be restored. Use the SDMSpeed() instruction to change the SDM bit period. Use the following values for the listed dataloggers: