RETIRED ›
This product is no longer available and has been replaced by: CSAT3B. Some accessories, replacement parts, or services may still be available.
CSAT3 Anemómetro sónico 3-D
Services Available
Repair Yes
Calibration Yes
Free Support Yes

Resumen

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.

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Ventajas y características

  • Proporciona medidas precisas de turbulencia con mínima distorsión del flujo de aire
  • El termopar de hilo fino FW05 (12,7μm de diámetro) está disponible como opción para medidas de temperatura del aire de respuesta rápida
  • Resiste la exposición a condiciones climáticas adversas
  • Las medidas se pueden utilizar para el cálculo del "momentum flux" y "friction velocity"
  • Compatible con la mayoría de dataloggers Campbell Scientific

Imágenes

Descripción técnica

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.

Especificaciones

Measurement Path Length
  • 10.0 cm (3.94 in.) vertical
  • 5.8 cm (2.28 in.) horizontal
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
Current
  • 200 mA (60 Hz measurement rate)
  • 100 mA (20 Hz measurement rate)
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)

Measurements

Outputs 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.
Measurement Resolution
  • 0.06° rms (wind direction)
  • 15 mm/s (0.025°C) rms (c)
  • 0.5 mm/s rms (uz)
  • Resolution values are for instantaneous measurements made on a constant signal; noise is not affected by sample rate.
  • 1 mm/s rms (ux, uy)
Offset Error
  • < ±8.0 cm/s (ux, uy)
  • Offset error and gain error values assume the -30° to +50°C range, wind speeds of < 30 m/s, and wind angles between ±170°.
  • < ±4.0 cm/s (uz)
Gain Error
  • < ±2% of reading (wind vector within ±5° of horizontal)
  • < ±6% of reading (wind vector within ±20° of horizontal)
  • < ±3% of reading (wind vector within ±10° of horizontal)
  • Offset error and gain error values assume the -30° to +50°C range, wind speeds of < 30 m/s, and wind angles between ±170°.
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

Analog

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)

Compatibilidad

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Dataloggers

Product Compatible Note
CR1000
CR200X (retired)
CR300
CR6
CR800
CR850

Miscellaneous

Product Compatible Note
21X (retired)
CR10 (retired)
CR10X (retired)
CR216X (retired)
CR23X (retired)
CR3000
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR9000 (retired)
CR9000X

Información de compatibilidad adicional

Data Logger Considerations

Required Operating Systems or PROMs
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
CR10 2K 5954-396;
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

Descargas

CSAT3 (567 KB) 24-03-1998

PC support software for monitoring and configuring the CSAT3.

Preguntas frecuentes

Número de FAQs relacionadas con CSAT3: 25

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  1. 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.

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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. 

  7. 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.

  8. 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:

    • CR3000: 50
    • CR800, CR850, or CR1000: 100
    • CR5000: 90
  9. 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.)

  10. The CSAT3 is compatible with three output signals: analog, RS-232, and Synchronous Device for Measurement (SDM). The CSAT3 can be interfaced to any data acquisition system that is compatible with analog measurements or RS-232 serial communications. SDM is used with Campbell Scientific data loggers.

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