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This product is no longer available and has been replaced by: CSAT3B.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

Überblick

Das CSAT3 ist ein dreidimensionales Ultraschall-Anemometer, das die 3 orthogonalen Windkomponenten und die Schallgeschwindigkeit misst. In Eddy-Kovarianzmessungen kann es die turbulenten Änderungen des horizontalen und vertikalen Winds bestimmen. Daraus wird Impulsfluss und Reibungsgeschwindigkeit errechnet.

Das CSAT3 kann auch durchschnittliche horizontale Windgeschwindigkeit und -richtung bestimmen.

Es wird mit 7,5m Kabel geliefert.

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Funktionen und Vorteile

  • Provides precision turbulence measurements with minimal flow distortion
  • FW05 fine wire thermocouple (12.7 μm diameter) is available as an option for fast response temperature measurements
  • Withstands exposure to harsh weather conditions
  • Measurements can be used to calculate momentum flux and friction velocity
  • Compatible with most Campbell Scientific data loggers

Bilder

Technische Beschreibung

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.

Spezifikationen

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

Kompatibel mit

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

Datenlogger

Product Compatible Note
CR1000
CR200X (retired)
CR216X (retired)
CR300
CR3000
CR5000 (retired)
CR6
CR800
CR850
CR9000X

Additional Compatibility Information

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

Downloads

CSAT3 (567 KB) 24-03-1998

PC support software for monitoring and configuring the CSAT3.

FAQs für

Number of FAQs related to CSAT3: 25

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  1. No. The CSAT3 is a sensor. Time stamps are assigned to the CSAT3 data by the data acquisition system—typically a Campbell Scientific datalogger or PC.

  2. 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.

  3. Yes. The bubble level can be replaced in the field using pn 31962, 1-Ring Replacement Bubble Level with Mounting Bumper and Hardware.

  4. 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.

  5. 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.

  6. 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.

  7. 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.)

  8. The CSAT3, like other sonic anemometers, measures wind speed along the sonic path using ultrasonic signals. If the salt spray blocks the sonic path, the CSAT3 will not be able to make measurements. The same is true if a thick layer of salt is deposited on the transducer faces.

  9. The CSAT3 offset specification is ±8 cm/s. Therefore, it cannot be used in an application where the expected wind speed is in the range of ±5 cm/s.

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