CSAT3B 3-D Sonic Anemometer with Integrated Electronics
Precision measurements, designed for flux and other turbulence research projects
9 ₫
Campbell Scientific’s CSAT3B 3-D Sonic Anemometer is an update and replacement to the original CSAT3, and remains the 3-D sonic anemometer of choice for eddy-covariance measurements. It has an aerodynamic design, a 10 cm vertical measurement path, operates in a pulsed acoustic mode, and withstands exposure to harsh weather conditions. Three orthogonal wind components (ux, uy, uz) and the sonic temperature (Ts) are measured and output at a maximum rate of 100 Hz.
Measurements can be triggered from three sources:
Data logger SDM command
Data logger CPI command
CSAT3B internal clock
The SDM and CPI protocols both support mechanisms for synchronizing multiple CSAT3Bs.
New conformal coating helps protect sonic transducers in corrosive environments
Integrated electronics that provide easy mounting of a single piece of hardware
Integrated inclinometer
High-precision measurements ideal for turbulence and eddy-covariance studies
An improved design with a thin, aerodynamic support strut close to the ends of the sensor arms, creating greater rigidity and improved accuracy of sonic temperature
Data logger sampling supported for any frequency between 1 and 100 Hz
New CPI communications for more robust, higher bandwidth measurements
Multiple communication options including SDM, CPI, USB, and RS-485
Internal temperature and humidity measurements with easily replaced desiccant
Version 5 algorithm for calculating data outputs; combines the signal sensitivity of version 3 with the rain performance of version 4
Includes options to filter high frequencies for applications requiring analysis of non-aliased spectra
Sensor
3-dimensional sonic anemometer
Measurement Description
Highest-quality wind speed and direction
Operating Temperature Range
-40 to +50°C (equivalent to 305 to 368 m s-1 in speed of sound)
Outputs
ux, uy, uz, Ts (ux, uy, uz are wind components referenced to the anemometer axes; Ts is sonic temperature in degrees Celsius.)
Signal Type/Output
SDM, CPI, USB, RS-485
Speed of Sound
Determined from three acoustic paths. (Corrected for crosswind effects.)
Wind Direction Range
2.5 to 357.5° in CSAT3B coordinate system (0 to 360° customized)
Range
± 65 m s–1 (full-scale wind)
Filter Bandwidths
5, 10, or 25 Hz
Measurement Path Length
10.0 cm (3.9 in.) vertical; 5.8 cm (2.3 in.) horizontal
Transducer Angle from Horizontal
60 degrees
Ingress Protection
IP67
Transducer Diameter
0.64 cm (0.25 in.)
Transducer Mounting Arm Diameter
0.84 cm (0.33 in.)
Support Arm Diameter
1.59 cm (0.63 in.)
Anemometer Head Weight
1.45 kg (3.2 lb)
Anemometer Dimensions
60.64 x 12.2 x 43.0 cm (23.87 x 4.8 x 16.9 in.)
Wind Accuracy
-NOTE-
Accuracy specifications assume the following:
-40° to +50°C operating range
Wind speeds < 30 m s-1
Wind angles between ±170°
Maximum Offset Error
< ±8.0 cm s-1 (ux, uy), < ±4.0 cm s-1 (uz)
Maximum Gain Error
< ±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)
Measurement Resolution
ux, uy
1 mm s-1 rms
uz
0.5 mm s-1 rms
Ts
0.002°C RMS (at 25°C)
Wind Direction
< 0.058° (ux = uy ≤ 1 m s-1)
Measurement Rates
Data Logger Triggered
1 to 100 Hz
Unprompted Output (to PC)
10, 20, 50, or 100 Hz
Internal Self-Trigger Rate
100 Hz
Measurement Delay
Data Logger Triggered (no filter)
1 trigger period (1 scan interval)
Unprompted Output (no filter)
10 ms
Filtered Output (data-logger-prompted or unprompted to PC)
795 ms (with 5 Hz bandwidth filter)
395 ms (with 10 Hz bandwidth filter)
155 ms (with 25 Hz bandwidth filter)
Internal Monitor Measurements
Update Rate
2 Hz
Inclinometer Accuracy
±1°
Relative Humidity Accuracy
±3% (over 10 to 90% range)
±7% (over 0 to 10% range)
±7% (over 90 to 100 % range)
Board Temperature Accuracy
±2°C
SDM
-NOTE-
Used for data-logger-based data acquisition.
Bit Period
10 µs to 1 ms
Cable Length
7.6 m (25 ft) max (@ 10 µs bit period)
76 m (250 ft) max (@ 1 ms bit period)
Address Range
1 to 14
Bus Clocks per Sample
~200
CPI
-NOTE-
Used for data-logger-based data acquisition.
Baud Rate
50 kbps to 1 Mbps
Cable Length
15 m (50 ft) max (@ 1 Mbps)
122 m (400 ft) max (@ 250 kbps)
853 m (2800 ft) max (@ 50 kbps)
Address Range
1 to 120
Bus Clocks per Sample
~300
RS-485
-NOTE-
Used for configuration or PC-based data acquisition.
Baud Rate
9.6 kbps to 115.2 kbps
Cable Length
305 m (1000 ft) max (@ 115.2 kbps)
610 m (2000 ft) max (@ 9.6 kbps)
Bus Clocks per Sample
~500 (ASCII formatted)
USB
-NOTE-
Used for configuration or PC-based data acquisition.
Connection Speed
USB 2.0 full speed 12 Mbps
Cable Length
5 m (16.4 ft) maximum
Power Requirements
Voltage Supply
9.5 to 32 Vdc
Current at 10 Hz Measurement Rate
110 mA (@ 12 Vdc)
65 mA (@ 24 Vdc)
Current at 100 Hz Measurement Rate
145 mA (@ 12 Vdc)
80 mA (@ 24 Vdc)
Brochures: CSAT3B 3-D Sonic Anemometer with Integrated Electronics
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Manuals: CSAT3B Three-Dimensional Sonic Anemometer
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Manual: CSAT3B Packing Information
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Manual: Recovery of the three-dimensional wind and sonic temperature data from a physically deformed sonic anemometer
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